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2009-01-03 by andre1moreau
Hello, After calibrating two Samsung monitors, one 22" and one 30" with GretagMacbeth Eye-One Match 3, I've noticed that when displaying a 21 Grayscale Stepwedge, there are still traces of red in a some of the wedges. Another run at calibration was undertaken with BasICColor trial software. Same results with the stepwedges. Is this something expected of LCD monitors, or is there something I'm missing? TIA, Andre
2009-01-04 by Jon Cone
Andre, This parallels a discussion in progress on the Piezography list. What you did when calibrating your two LCDs was not to calibrate your two LCDs but to calibrate the video board of your computer because that is what EyeOne and CV Spyder, etc do. Your video board when it is not calibrated has the ability to output 256red x 256green x 256 blue output levels to produce 16.7 million colors. In order to render grayscale without banding you need all those levels... What calibration does is to reduce the output levels of the video board in order to realize the targets of color temperature, brightness, etc... and saves this as a vLUT which loads when you startup your computer. Think of the vLUT as three curves being applied to your video board... Calibrator displays like the Eizo CG series have an on-board hardware engine that produces billions of colors. The video board is left at 8 bit (16.7 million colors), and the calibration procedure tunes the actual engine to select the most appropriate 16.7 million display colors. Of course this display has an additional cable running to the computer and when the EyeOne instrument or CV instrument is measuring, the Eizo software is adjusting the hardware engine of the display. The video cable and this additional cable are forming a loop. And this is why calibrator reference displays which calibrate in hardware rather than software can display amazingly good grayscales. The Sony Artisan was THE example of a calibrator display. The Eizo CG series advertises itself to have nearly the same capability. If you can intervene in the Expert or Advance mode of the EyeOne and use the Samsung manual controls (if they exist) to dial in the target color temp, brightness and contrast, you may have a better chance of having the EyeOne Match produce a less evasive vLUT on your video board. The idea being here not to just let EyeOne measure your native temp and brightness, etc but to select the manual portions of Match to dial in these by hand. Earlier versions of the software allowed this. I am hopeful yours still does. I can't check as I only use Artisans. But launch and see if there is an Expert Mode or a mode which allows you to use the display controls to dial in to the target. CM used to have a setup which alerted you when the target was reached. Color Temp is very critical here as the vLut just yanks down the output of 1 or more channels in order to get there... it clips. :( Prove it! a very old monitor calibration system used to display the vLUT simultaneously... was magic in allowing the user to try and leave it as intact as possible. Its discontinued but there must be software out there that you can use with the EyeOne that really allows you to do as much as possible on your own. Of course your Samsungs have to give you access to their engine in some way or the whole point is moot. Hope this helps, Jon Cone --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "andre1moreau" <andre1moreau@...> wrote:
> > Hello, > > After calibrating two Samsung monitors, one 22" and one 30" with > GretagMacbeth Eye-One Match 3, I've noticed that when displaying a 21 > Grayscale Stepwedge, there are still traces of red in a some of the > wedges. > > Another run at calibration was undertaken with BasICColor trial > software. Same results with the stepwedges. > > Is this something expected of LCD monitors, or is there something I'm > missing? > > TIA, > Andre >
2009-01-04 by cdtobie
On Jan 4, 2009, at 11:24:48 AM, "Jon Cone" <jon@...> wrote: This parallels a discussion in progress on the Piezography list. What you did when calibrating your two LCDs was not to calibrate your two LCDs but to calibrate the video board of your computer because that is what EyeOne and CV Spyder, etc do. ___ Hi Jon, Well, its one part of what they do... They start by doing any possible hardware calibration at the display, then move on the VLUT adjustments, and of course create a profile defining the result when they are done. Your video board when it is not calibrated has the ability to output 256red x 256green x 256 blue output levels to produce 16.7 million colors. ___ Raw color, maximum number of values, but uncorrected... like printing without color management... In order to render grayscale without banding you need all those levels... ___ In order to get nice smooth grays on screen, you should certainly minimize the adjustments you make at the videocard level... none of this effects the print, only the screen view, but its nice to not have excessive banding on screen, as it interferes with seeing your image... What calibration does is to reduce the output levels of the video board in order to realize the targets of color temperature, brightness, etc... ___ No, first it does any adjustment that is possible at the hardware controls level, which is certainly how "brightness" is adjusted in virtually all cases. Color temp adjustment, for displays have RGB Gains controls, are also done at the display hardware control level. If Gains are not available, and you do not choose Native as your whitepoint, and you do not have a display with LUT capabilities in the display, then yes, the final choice is that the VLUTs in the videocard are adjusted for this, as is gray balance. and saves this as a vLUT which loads when you startup your computer. Think of the vLUT as three curves being applied to your video board... Calibrator displays like the Eizo CG series have an on-board hardware engine that produces billions of colors. ___ Which is why users are instructed to set the Whitepoint and Gamma at the display LUT level on such high end graphics displays first, in advance of running third party display calibration software; or to use software that does both. This could mean running a display manufacturer's software once, to generally define gamma and whitepoint, then running a third party product such as Spyder3Elite every few weeks, on the high end graphics display and your other displays as well (the specialty software for such displays does not typically play well with other displays or calibrated multiple display setups). Or it might mean simply running the manufacturer's display software once in a while, if your needs are simpler. Or it might mean using a specialty product such as ColorEyes to control the internal LUTs on the display, as well as doing your general profiling of all displays. The order of priority that calibration products use is: set display hardware controls to optimal adjustments first (where available), set display LUTs to any further corrections next, (if available), set videocard LUTs to any remaining needed corrections, and finally, define the end result in an ICC profile. Displays not having hardware controls or internal LUTs should be targeted to Whitepoint and Gamma values reasonably close to their native values, to avoid visible banding caused by moving them too far with videocard VLUT corrections. Those with such controls can afford to be adjusted somewhat somewhat more widely. The new Apple 24 inch LED Cinema Display, for instance, has neither hardware controls (beyond backlight control for brightness) nor internal LUTs; but since its native gamma and whitepoint are close to desired values, it calibrates nicely without them, and at a price below displays with internal LUTs. Once videocards and OSes have a functioning high bit pathway from the card to the display, this will all become moot, and the desirable features of internal LUTs will be equally functional at the videocard LUTs, ending the whole problem of proprietary access to internal LUTs and the communication issues that ensue, and eliminating most needs for displays with internal LUTs. Please feel free to repost to your other list... -- C. David Tobie WW Product Technology Manager Digital Imaging & Home Theater Datacolor CDTobie@... www.datacolor.com/spyder3 [Non-text portions of this message have been removed]
2009-01-04 by Jon Cone
Well Andre, This begs the question of you... Did you, or if you did, were you successful in setting the temperature and brightness, etc using your display's settings controls? Did you get some software feedback or simply click on the available preset temperature etc in the Samsung? We have a lot of displays in our classroom and some have pre-sets which are wicked off from what the pre-set infers. Did you actually tweak the color and brightness, ?? Or do you have a vLUT which maaaaaaay be interfering? I guess David is pointing out that you have a responsibility to set all these settings in order for the calibration software to do what it is supposed to do to be less evasive and that is part of their instruction set now. What do you think? Jon --- In DigitalBlackandWhiteThePrint@yahoogroups.com, cdtobie <CDTobie@...> wrote:
> > > On Jan 4, 2009, at 11:24:48 AM, "Jon Cone" <jon@...> wrote: > > This parallels a discussion in progress on the Piezography list. What > you did when calibrating your two LCDs was not to calibrate your two > LCDs but to calibrate the video board of your computer because that is > what EyeOne and CV Spyder, etc do. > ___ > Hi Jon, > > Well, its one part of what they do... They start by doing any possible > hardware calibration at the display, then move on the VLUT > adjustments, and of course create a profile defining the result when > they are done. > > > Your video board when it is not > calibrated has the ability to output 256red x 256green x 256 blue > output levels to produce 16.7 million colors. > ___ > Raw color, maximum number of values, but uncorrected... like printing > without color management... > > In order to render > grayscale without banding you need all those levels... > ___ > In order to get nice smooth grays on screen, you should certainly > minimize the adjustments you make at the videocard level... none of > this effects the print, only the screen view, but its nice to not have > excessive banding on screen, as it interferes with seeing your > image... > > > What calibration does is to reduce the output levels of the video > board in order to realize the targets of color temperature, > brightness, etc... > ___ > No, first it does any adjustment that is possible at the hardware > controls level, which is certainly how "brightness" is adjusted in > virtually all cases. Color temp adjustment, for displays have RGB > Gains controls, are also done at the display hardware control level. > If Gains are not available, and you do not choose Native as your > whitepoint, and you do not have a display with LUT capabilities in the > display, then yes, the final choice is that the VLUTs in the videocard > are adjusted for this, as is gray balance. > and saves this as a vLUT which loads when you > startup your computer. Think of the vLUT as three curves being applied > to your video board... > > Calibrator displays like the Eizo CG series have an on-board hardware > engine that produces billions of colors. > ___ > Which is why users are instructed to set the Whitepoint and Gamma at > the display LUT level on such high end graphics displays first, in > advance of running third party display calibration software; or to use > software that does both. This could mean running a display > manufacturer's software once, to generally define gamma and > whitepoint, then running a third party product such as Spyder3Elite > every few weeks, on the high end graphics display and your other > displays as well (the specialty software for such displays does not > typically play well with other displays or calibrated multiple display > setups). Or it might mean simply running the manufacturer's display > software once in a while, if your needs are simpler. Or it might mean > using a specialty product such as ColorEyes to control the internal > LUTs on the display, as well as doing your general profiling of all > displays. > > > The order of priority that calibration products use is: set display > hardware controls to optimal adjustments first (where available), set > display LUTs to any further corrections next, (if available), set > videocard LUTs to any remaining needed corrections, and finally, > define the end result in an ICC profile. Displays not having hardware > controls or internal LUTs should be targeted to Whitepoint and Gamma > values reasonably close to their native values, to avoid visible > banding caused by moving them too far with videocard VLUT corrections. > Those with such controls can afford to be adjusted somewhat somewhat > more widely. The new Apple 24 inch LED Cinema Display, for instance, > has neither hardware controls (beyond backlight control for > brightness) nor internal LUTs; but since its native gamma and > whitepoint are close to desired values, it calibrates nicely without > them, and at a price below displays with internal LUTs. > > Once videocards and OSes have a functioning high bit pathway from the > card to the display, this will all become moot, and the desirable > features of internal LUTs will be equally functional at the videocard > LUTs, ending the whole problem of proprietary access to internal LUTs > and the communication issues that ensue, and eliminating most needs > for displays with internal LUTs. > > Please feel free to repost to your other list... > -- > C. David Tobie > WW Product Technology Manager > Digital Imaging & Home Theater > Datacolor > CDTobie@... > www.datacolor.com/spyder3 > > > [Non-text portions of this message have been removed] >
2009-01-04 by cdtobie
On Jan 3, 2009, at 6:46:24 PM, andre1moreau <andre1moreau@...> wrote: After calibrating two Samsung monitors, one 22" and one 30" with GretagMacbeth Eye-One Match 3, I've noticed that when displaying a 21 Grayscale Stepwedge, there are still traces of red in a some of the wedges. Another run at calibration was undertaken with BasICColor trial software. Same results with the stepwedges. Is this something expected of LCD monitors, or is there something I'm missing? ___ You are using the same device both times. What it thinks is neutral is consistent both times. What another device would think is neutral might well be a bit different. -- C. David Tobie WW Product Technology Manager Digital Imaging & Home Theater Datacolor CDTobie@... www.datacolor.com/spyder3 [Non-text portions of this message have been removed]
2009-01-04 by Jon Cone
--- In DigitalBlackandWhiteThePrint@yahoogroups.com, cdtobie <CDTobie@...> wrote: > > ___ > You are using the same device both times. What it thinks is neutral is consistent both times. What another device would think is neutral might well be a bit different. David, Are you saying that Andre can not calibrate the displays he owns to neutral? Is "it" the samsung or is "it" the colorimeter? It really depends upon what the meaning of "it" is doesn't it? Jon
2009-01-04 by Cdtobie
The same calibrator is being used with two different software packages to calibrate the same display. It produces rhe same gray balance both times. That implies that it's the calibrator causing the "flavoring" of the grays. If he now uses the same software, with a different brand of calibrator, I suspect he will get a somewhat different gray balance. This can actually be done, by borrowing a Spyder3, and running it with ColorEyes. C. D. Tobie WW Product Technology Mngr. Digital Imaging & Home Theater DataColor.com CDTobie@...
On Jan 4, 2009, at 2:18 PM, "Jon Cone" <jon@inkjetmall.com> wrote: > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, cdtobie > <CDTobie@...> wrote: >> >> ___ >> You are using the same device both times. What it thinks is neutral > is consistent both times. What another device would think is neutral > might well be a bit different. > > David, > > Are you saying that Andre can not calibrate the displays he owns to > neutral? Is "it" the samsung or is "it" the colorimeter? > > It really depends upon what the meaning of "it" is doesn't it? > > Jon > > > ------------------------------------ > > Please visit the Group Homepage to check the Files, and other > resources as they are often being updated. > > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint > > If you wish to receive no emails or just a daily digest, or you wish > to unsubscribe, please edit your Membership preferences by visiting > this same page. > > Please follow these basic guidelines: > - As threads develop, trim off excess portions of earlier messages > to keep them short. > - Good manners are required at all time. No personal attacks or > flames. Hostile, aggressive or argumentative users may be removed > from the membership without notice. > - Keep your posts and threads related to the group topic of digital > B&W printing. Users who persistently make off-topic posts may be > removed from the membership. > - By posting on this forum you agree to abide by the group rules and > guidelines, and to abide by the actions and decisions of the group > Owner and Moderators. See “Group Topic, Rules and Guidelines” in > the Files section: > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/ > > BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE > PRINT YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE “OWNE > R” AND “MODERATORS” OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL > NOT BE LIABLE TO YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, > CONSEQUENTIAL OR EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DA > MAGES FOR LOSS OF PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE L > OSSES (EVEN IF THE “OWNER” AND “MODERATORS” OF DIGITAL BW, > THE PRINT YAHOO GROUP HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH D > AMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY TO USE THE DIG > ITAL BW, THE PRINT YAHOO GROUP; (ii) UNAUTHORIZED ACCESS TO OR ALTER > ATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF > ANY THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) AN > Y OTHER MATTER RELATING TO THE DIGITAL BW, THE PRINT YAHOO GROUP. > Yahoo! Groups Links > > >
2009-01-04 by Cdtobie
I'm not simply saying the end user must do these things in the right order; I'm explaining that the software will run you through doing most of them in the correct order, as part of the calibration/ profiling process. C. D. Tobie WW Product Technology Mngr. Digital Imaging & Home Theater DataColor.com CDTobie@...
On Jan 4, 2009, at 12:59 PM, "Jon Cone" <jon@...> wrote: > Well Andre, > > This begs the question of you... > > Did you, or if you did, were you successful in setting the temperature > and brightness, etc using your display's settings controls? Did you > get some software feedback or simply click on the available preset > temperature etc in the Samsung? > > We have a lot of displays in our classroom and some have pre-sets > which are wicked off from what the pre-set infers. Did you actually > tweak the color and brightness, ?? Or do you have a vLUT which > maaaaaaay be interfering? > > I guess David is pointing out that you have a responsibility to set > all these settings in order for the calibration software to do what it > is supposed to do to be less evasive and that is part of their > instruction set now. > > What do you think? > > Jon > > > > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, cdtobie > <CDTobie@...> wrote: >> >> >> On Jan 4, 2009, at 11:24:48 AM, "Jon Cone" <jon@...> wrote: >> >> This parallels a discussion in progress on the Piezography list. What >> you did when calibrating your two LCDs was not to calibrate your two >> LCDs but to calibrate the video board of your computer because that >> is >> what EyeOne and CV Spyder, etc do. >> ___ >> Hi Jon, >> >> Well, its one part of what they do... They start by doing any >> possible >> hardware calibration at the display, then move on the VLUT >> adjustments, and of course create a profile defining the result when >> they are done. >> >> >> Your video board when it is not >> calibrated has the ability to output 256red x 256green x 256 blue >> output levels to produce 16.7 million colors. >> ___ >> Raw color, maximum number of values, but uncorrected... like printing >> without color management... >> >> In order to render >> grayscale without banding you need all those levels... >> ___ >> In order to get nice smooth grays on screen, you should certainly >> minimize the adjustments you make at the videocard level... none of >> this effects the print, only the screen view, but its nice to not >> have >> excessive banding on screen, as it interferes with seeing your >> image... >> >> >> What calibration does is to reduce the output levels of the video >> board in order to realize the targets of color temperature, >> brightness, etc... >> ___ >> No, first it does any adjustment that is possible at the hardware >> controls level, which is certainly how "brightness" is adjusted in >> virtually all cases. Color temp adjustment, for displays have RGB >> Gains controls, are also done at the display hardware control level. >> If Gains are not available, and you do not choose Native as your >> whitepoint, and you do not have a display with LUT capabilities in >> the >> display, then yes, the final choice is that the VLUTs in the >> videocard >> are adjusted for this, as is gray balance. >> and saves this as a vLUT which loads when you >> startup your computer. Think of the vLUT as three curves being >> applied >> to your video board... >> >> Calibrator displays like the Eizo CG series have an on-board hardware >> engine that produces billions of colors. >> ___ >> Which is why users are instructed to set the Whitepoint and Gamma at >> the display LUT level on such high end graphics displays first, in >> advance of running third party display calibration software; or to >> use >> software that does both. This could mean running a display >> manufacturer's software once, to generally define gamma and >> whitepoint, then running a third party product such as Spyder3Elite >> every few weeks, on the high end graphics display and your other >> displays as well (the specialty software for such displays does not >> typically play well with other displays or calibrated multiple >> display >> setups). Or it might mean simply running the manufacturer's display >> software once in a while, if your needs are simpler. Or it might mean >> using a specialty product such as ColorEyes to control the internal >> LUTs on the display, as well as doing your general profiling of all >> displays. >> >> >> The order of priority that calibration products use is: set display >> hardware controls to optimal adjustments first (where available), set >> display LUTs to any further corrections next, (if available), set >> videocard LUTs to any remaining needed corrections, and finally, >> define the end result in an ICC profile. Displays not having hardware >> controls or internal LUTs should be targeted to Whitepoint and Gamma >> values reasonably close to their native values, to avoid visible >> banding caused by moving them too far with videocard VLUT >> corrections. >> Those with such controls can afford to be adjusted somewhat somewhat >> more widely. The new Apple 24 inch LED Cinema Display, for instance, >> has neither hardware controls (beyond backlight control for >> brightness) nor internal LUTs; but since its native gamma and >> whitepoint are close to desired values, it calibrates nicely without >> them, and at a price below displays with internal LUTs. >> >> Once videocards and OSes have a functioning high bit pathway from the >> card to the display, this will all become moot, and the desirable >> features of internal LUTs will be equally functional at the videocard >> LUTs, ending the whole problem of proprietary access to internal LUTs >> and the communication issues that ensue, and eliminating most needs >> for displays with internal LUTs. >> >> Please feel free to repost to your other list... >> -- >> C. David Tobie >> WW Product Technology Manager >> Digital Imaging & Home Theater >> Datacolor >> CDTobie@... >> www.datacolor.com/spyder3 >> >> >> [Non-text portions of this message have been removed] >> > > > > ------------------------------------ > > Please visit the Group Homepage to check the Files, and other > resources as they are often being updated. > > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint > > If you wish to receive no emails or just a daily digest, or you wish > to unsubscribe, please edit your Membership preferences by visiting > this same page. > > Please follow these basic guidelines: > - As threads develop, trim off excess portions of earlier messages > to keep them short. > - Good manners are required at all time. No personal attacks or > flames. Hostile, aggressive or argumentative users may be removed > from the membership without notice. > - Keep your posts and threads related to the group topic of digital > B&W printing. Users who persistently make off-topic posts may be > removed from the membership. > - By posting on this forum you agree to abide by the group rules and > guidelines, and to abide by the actions and decisions of the group > Owner and Moderators. See “Group Topic, Rules and Guidelines” in > the Files section: > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/ > > BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE > PRINT YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE “OWNE > R” AND “MODERATORS” OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL > NOT BE LIABLE TO YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, > CONSEQUENTIAL OR EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DA > MAGES FOR LOSS OF PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE L > OSSES (EVEN IF THE “OWNER” AND “MODERATORS” OF DIGITAL BW, > THE PRINT YAHOO GROUP HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH D > AMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY TO USE THE DIG > ITAL BW, THE PRINT YAHOO GROUP; (ii) UNAUTHORIZED ACCESS TO OR ALTER > ATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF > ANY THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) AN > Y OTHER MATTER RELATING TO THE DIGITAL BW, THE PRINT YAHOO GROUP. > Yahoo! Groups Links > > >
2009-01-05 by andre1moreau
Thanks to Jon and C.David for their replies. I'll try to provide more information that I hope can shed more light unto the observation of traces of color appearing when displaying a grayscale 21 stepwedge on both Samsung LCD monitors. The Samsung monitors (22" and 30") are connected to different WinTel machines. Brightness and contrast adjustments were done during the calibration procedure with the software at hand. With both monitors, the color temperature was at 6600K before calibration and it was adjusted for a target of 6500K Further verification shows that basICColor did not produce the same results as the Match v3 on the 22" LCD monitor. The 21 stepwedge shows some traces of blue in the highlights with the BasICColor. On the 30" monitor, there are no visible differences in the generated profiles by both software. Regards, Andre
2009-01-05 by Louis Dina
Andre: If you have a Samsung Synchmaster, adjustments made to color, contrast, gamma and everything else using the controls on the monitor itself (except the intensity of the backlight, which is the only analog adjustment) are written to the video card anyway. If you are hooked up to the monitor through a digital connection, you will generally get better results. My 24" Synchmaster is hooked up to a Matrox Parhelia video card, and during calibration, ALL monitor controls are disabled, except the intensity of the backlight. All adjustments will be written to the video card anyway, so it is a moot point. If you hook your LCD up to an analog connection, you will be able to adjust color, contrast, gamma, etc using the monitor controls, but again, they are written to the video card anyway. I have a second Synchmaster monitor hooked up to the analog port, so I can adjust it independently (my video card does not have two independent VLUTs). I just use it for palettes anyway, so it doesn't have to be perfect. Even on my large monitor (hooked up to the digital port) my grayscale is not perfect, but it is mighty close. Probably has to do with 8 bit rounding error and limitations of the software. Simple curves are used to correct the colors in your video card's VLUT, so not all of points will be perfectly neutral. If you want to approach perfection, be prepared to spend money for a monitor that has adjustments that can be made independent of the video card (like a high end Eizo). Frankly, I don't really sweat it even if my grayscale is not perfect. It may be noticeable when dealing with computer generated grayscale ramps, but rarely noticeable in a continuous tone image. When I have a critical gray (and am working in RGB) I just use the info palette to make sure my tones are neutral. Hope this helps. Lou --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "andre1moreau" <andre1moreau@...> wrote:
> > Thanks to Jon and C.David for their replies. > > I'll try to provide more information that I hope can shed more light > unto the observation of traces of color appearing when displaying a > grayscale 21 stepwedge on both Samsung LCD monitors. > > The Samsung monitors (22" and 30") are connected to different WinTel > machines. > > Brightness and contrast adjustments were done during the calibration > procedure with the software at hand. > > With both monitors, the color temperature was at 6600K before > calibration and it was adjusted for a target of 6500K > > Further verification shows that basICColor did not produce the same > results as the Match v3 on the 22" LCD monitor. The 21 stepwedge shows > some traces of blue in the highlights with the BasICColor. > > On the 30" monitor, there are no visible differences in the generated > profiles by both software. > > Regards, > Andre >