Photoshop: Please allow to using decimals in colors

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  • Updated 2 months ago
  • (Edited)
Especially when Lab model is used, gray values have only 100 levels. If sample card is created for camera calibration then 1% accuracy is far from to be sufficient. The problem is growing when this pattern is printed. Eg 50% gray  can produce 50% gray on prints but 51% gray can produce 54% gray. It could happen even if everything is calibrateted. Only way to compensate this is trying to set intermediate values 50.3...50.5 and measure print results again.

For now, only way to solve the Photoshop's limitation is to draw gradient as helper object, use eyedropper tool in 32-bit color mode in Info Panel, moving eyedropper over the gradient in order to find desired value and click on it. Then this sampled color can be used for filling  suitable area. It creates horrible procedure. Enabling decimals will solve the problem.
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Marek Szopinski

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Posted 2 months ago

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Photo of Scott Martin

Scott Martin

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I agree and have struggled with this for almost 20 years. I'm finding a need for greater precision particulrarly when working with paper white simulations. When taking measurements with a spectro and translating those Lab values to the RGB working space the rounding is significant and this is especially seen in the highlights. Here's what you can to do see this for yourself: In the Color Picker, start with L=100 a=0 b=0. If you decrease the "a" value by one integer the R value drops 2 points. Increase the "b" value by one integer and the B value drops by two points. While this may not seem visually significant to you, for color science projects like G7 Certification this increases our DeltaE variances to unacceptable levels. Why not allow us to define Lab values to at least one decimal point? For color science professionals this would really make a difference.