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.
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.
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...
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.
Thank you Conroy.. I have shared the file here
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.
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.
Can someone explain this?
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