Digital BW, The Print

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]
>>
>
>
>
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