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RGB puzzle

RGB puzzle

2006-03-14 by Bailey Donnally

My PrintFix Pro arrived only two days after I ordered it.  Great!  I
made some profiles and they were very good.  I even printed some black
and white and they came out (drum roll) black and white.

But I am puzzled.  When I was reading patches (on the 225 patch
sample) the Lab reading shown near the lower left corner seems
reasonable, but the RGB values make no sense at all.  They seem to be
related to the position on the chart, not RGB values.  What is going
on here?  What does this RGB mean?

Re: [colorvision_group] RGB puzzle

2006-03-14 by David Miller

>My PrintFix Pro arrived only two days after I ordered it.  Great!  I
>made some profiles and they were very good.  I even printed some black
>and white and they came out (drum roll) black and white.
>
>But I am puzzled.  When I was reading patches (on the 225 patch
>sample) the Lab reading shown near the lower left corner seems
>reasonable, but the RGB values make no sense at all.  They seem to be
>related to the position on the chart, not RGB values.  What is going
>on here?  What does this RGB mean?
>

Those are just telling you what the "pure" values of the RGBs in the
target are at those locations. Only the Lab values that are displayed
for a patch (after taking a measurement) correspond to actual measured values.


-- 
David Miller
Senior Software Developer, Digital Color Solutions
ColorVision

Re: [colorvision_group] RGB puzzle

2006-03-14 by CDTobie@aol.com


In a message dated 3/14/06 11:17:14 AM, bdonnally@... writes:


But I am puzzled. When I was reading patches (on the 225 patch
sample) the Lab reading shown near the lower left corner seems
reasonable, but the RGB values make no sense at all. They seem to be
related to the position on the chart, not RGB values. What is going
on here? What does this RGB mean?


The unprofiled RGB values are the numbers that were sent out to the printer (the red patch would be 255, 0, 0) while the Lab values relate to the measurements that are taken from the printed patches.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com

Re: [colorvision_group] RGB puzzle

2006-03-14 by randy

I just tried this and am not showing a lab reading at all. Just a line 
of  ???,???,???

Randy Laskody

CDTobie@... wrote:
Show quoted textHide quoted text
>
> In a message dated 3/14/06 11:17:14 AM, bdonnally@... writes:
>
>
>> But I am puzzled.  When I was reading patches (on the 225 patch
>> sample) the Lab reading shown near the lower left corner seems
>> reasonable, but the RGB values make no sense at all.  They seem to be
>> related to the position on the chart, not RGB values.  What is going
>> on here?  What does this RGB mean?
>
>
>
> The unprofiled RGB values are the numbers that were sent out to the 
> printer (the red patch would be 255, 0, 0) while the Lab values relate 
> to the measurements that are taken from the printed patches.
>
> C. David Tobie
> Product Technology Manager
> ColorVision Business Unit
> Datacolor Inc.
> CDTobie@...
> www.colorvision.com
>
> SPONSORED LINKS
> Digital photography software 
> <http://groups.yahoo.com/gads?t=ms&k=Digital+photography+software&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=vcZVcv11-RF9aChCrpL-cA> 
> 	Digital photography 
> <http://groups.yahoo.com/gads?t=ms&k=Digital+photography&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=NPMG-BjOjJWWWu1WTDecRQ> 
> 	Digital photography course 
> <http://groups.yahoo.com/gads?t=ms&k=Digital+photography+course&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=GPs-R_fGq5Hih2NpQczQ8g> 
>
> Photography school 
> <http://groups.yahoo.com/gads?t=ms&k=Photography+school&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=pj3cKQlkMhgkqUXNMJjiCw> 
> 	Professional digital photography 
> <http://groups.yahoo.com/gads?t=ms&k=Professional+digital+photography&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=k7x9GYFzNn4NfJTZP-Vt_g> 
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>
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Re: RGB puzzle

2006-03-14 by Tom

--- In colorvision_group@yahoogroups.com, randy <rlphoto@...> wrote:
>
> I just tried this and am not showing a lab reading at all. Just a line 
> of  ???,???,???
> 

The ??? values show when you haven't yet measured a patch.  Try
hitting the back arrow to look at the patch you have just read :-)

Re: [colorvision_group] RGB puzzle

2006-03-14 by randy

oh I get it. you have to back up to see the measued values.

Randy

CDTobie@... wrote:
Show quoted textHide quoted text
>
> In a message dated 3/14/06 11:17:14 AM, bdonnally@... writes:
>
>
>> But I am puzzled.  When I was reading patches (on the 225 patch
>> sample) the Lab reading shown near the lower left corner seems
>> reasonable, but the RGB values make no sense at all.  They seem to be
>> related to the position on the chart, not RGB values.  What is going
>> on here?  What does this RGB mean?
>
>
>
> The unprofiled RGB values are the numbers that were sent out to the 
> printer (the red patch would be 255, 0, 0) while the Lab values relate 
> to the measurements that are taken from the printed patches.
>
> C. David Tobie
> Product Technology Manager
> ColorVision Business Unit
> Datacolor Inc.
> CDTobie@...
> www.colorvision.com
>
> SPONSORED LINKS
> Digital photography software 
> <http://groups.yahoo.com/gads?t=ms&k=Digital+photography+software&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=vcZVcv11-RF9aChCrpL-cA> 
> 	Digital photography 
> <http://groups.yahoo.com/gads?t=ms&k=Digital+photography&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=NPMG-BjOjJWWWu1WTDecRQ> 
> 	Digital photography course 
> <http://groups.yahoo.com/gads?t=ms&k=Digital+photography+course&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=GPs-R_fGq5Hih2NpQczQ8g> 
>
> Photography school 
> <http://groups.yahoo.com/gads?t=ms&k=Photography+school&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=pj3cKQlkMhgkqUXNMJjiCw> 
> 	Professional digital photography 
> <http://groups.yahoo.com/gads?t=ms&k=Professional+digital+photography&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=k7x9GYFzNn4NfJTZP-Vt_g> 
> 	Stock photography 
> <http://groups.yahoo.com/gads?t=ms&k=Stock+photography&w1=Digital+photography+software&w2=Digital+photography&w3=Digital+photography+course&w4=Photography+school&w5=Professional+digital+photography&w6=Stock+photography&c=6&s=176&.sig=H9bHMH_cKn4LEqWkcUABgg> 
>
>
>
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>
> ------------------------------------------------------------------------
>
>
>------------------------------------------------------------------------
>
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.1.375 / Virus Database: 268.2.2/280 - Release Date: 3/13/2006
>

Re: [colorvision_group] RGB puzzle

2006-03-14 by David Miller

>I just tried this and am not showing a lab reading at all. Just a line
>of  ???,???,???
>

It will only show you measurements when you have measurements.

If you move the cursor to a patch which is "empty" (will be white), then
there are no measurements to display.

As Tom says, while you're measuring, the cursor always gets moved one
slot ahead, to the next empty space, so until you've measured something
there, it doesn't know what to tell you.


-- 
David Miller
Senior Software Developer, Digital Color Solutions
ColorVision

Re: [colorvision_group] RGB puzzle

2006-03-14 by CDTobie@aol.com


In a message dated 3/14/06 1:31:25 PM, rlphoto@... writes:


I just tried this and am not showing a lab reading at all. Just a line
of ???,???,???


The Lab values are measured values. As the autoforward moves the active patch to the next unmeasured patch, there are never an Lab numbers to display. Use the arrow keys to move back through the measured patches, and Lab values will be displayed. Move forward into unmeasured patches, and question marks will appear.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@colorvision.com
www.colorvision.com

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