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descandelus
descandelus
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Measuring Color In photoshop after adjustments

Mar 21, 2013 11:22 AM

Tags: #photoshop #color #measurements

Hello,

 

So I am measuring the 'red' 'green' amd 'blue' values of a picture after I adjust the white balance with a grey card..   I notice that if I measure the colors from 'selected layer' they are different then if I select 'entire image'   thise are both different if i do not do any white balance adjustment..

 

Which is the correct measurement that I should record?    I want the the white balance adjustment included.

 

 

Thank you,

 

Ross

455 Views   10 Replies   Latest reply: descandelus, Mar 22, 2013 7:48 AM
 
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  • conroy
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    1. conroy,
    Mar 21, 2013 11:41 AM   in reply to descandelus
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    If you're talking about a histogram then a warning triangle containing an exclamation mark will let you know that you're viewing potentially inaccurate cached data. Click the triangle or the Uncached Refresh button to update with uncached data for an accurate measure.

     
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  • descandelus
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    2. descandelus,
    Mar 21, 2013 11:57 AM   in reply to conroy
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    Yes, but do I want to choose the color ranges from the 'selected layer' (maybe the adjustment?)   Or do I use the 'entire image' to measure the color..   Both measures change when I make a white balance adjustment so i am not sure which to choose...

     
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  • conroy
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    3. conroy,
    Mar 21, 2013 12:37 PM   in reply to descandelus
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    The measurements of "Selected Layer", if it's an opaque top layer with Normal blending mode, and "Entire image" should, I say should, be the same if they are both measuring uncached data. If you are absolutely definitely making sure that you are not measuring cached data and these measurements differ then I think you should upload your PSD to a server and post a link to it so people can investigate.

     
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  • descandelus
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    4. descandelus,
    Mar 21, 2013 3:50 PM   in reply to conroy
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    I hit the 'cache' circle deal and it still give me slightly different numbers for the measurements..  Which server should I upload the image to?   I can't just post it here?

     
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  • conroy
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    5. conroy,
    Mar 21, 2013 4:31 PM   in reply to descandelus
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    You can't attach PSD files to forum messages.

     

    You can use Dropbox: https://www.dropbox.com/tour

     
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  • descandelus
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    6. descandelus,
    Mar 21, 2013 5:23 PM   in reply to conroy
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    Thank you Conroy..   I have shared the file here

     

    https://www.dropbox.com/s/ndq8yz86npvj51h/K2R%20IV%20Mar%2021.psd

     

    If I click on the different layers, all the color measures are the same... However, if I select 'selected layer' on the historgram tab, then, the measures are slightly different.

     
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  • conroy
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    7. conroy,
    Mar 21, 2013 7:17 PM   in reply to descandelus
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    Yes, I'm getting a significant difference in the measurements.

     

    If the two layers are merged then the resulting layer measures the same as the "Entire Image" measurement. Therefore, I would trust the "Entire Image" measurement.

     

    The measurement of an adjustment layer alone is strange. Even a dummy adjustment layer that does nothing has a significantly different histogram than the image underneath it. Interestingly, dummy Levels, Curves and Exposure layers (and possibly others that I haven't checked) share the same strange measurement.

     

    It's not specific to your file, though.

     

    Here's screenshots of an example where the histogram of a dummy Curves layer is distinctly different to that of the underlying layer and composite image.

     

    Screen-shot-2013-03-22-at-02.01.36.png

     

    Screen-shot-2013-03-22-at-02.02.17.png

     

    Screen-shot-2013-03-22-at-02.02.28.png

     

    Can someone explain this?

     
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  • Noel Carboni
    21,315 posts
    Dec 23, 2006
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    8. Noel Carboni,
    Mar 21, 2013 7:40 PM   in reply to conroy
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    Hard to imagine what measurements it could be displaying for the "Selected Layer" when that layer is an Adjustment Layer.  Maybe the numbers would be good lottery plays...

     

    -Noel

     
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  • conroy
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    9. conroy,
    Mar 21, 2013 8:19 PM   in reply to Noel Carboni
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    Hey, don't jinx my Euromillions ticket for Friday!

     
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  • descandelus
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    10. descandelus,
    Mar 22, 2013 7:48 AM   in reply to conroy
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    Thanks guys!    This is good news for me as I have spent the last two weeks measuring color from the 'entire image' tab and I was gonna lose it if I had to redo everything..    

     
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