Color accuracy at background with no other layer (CMYK, 8bit)

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  • Problem
  • Updated 2 years ago
1. create new file, cmyk, 8bit.
2. set foreground color to 70 70 70 70 (for example)
3 fill background layer with foreground color
4 check it with info/picker
5 result - 69 69 69 69

According to tech support chat "Photoshop is not designed to work with one background layer and the first thing I shall turn it into a regular layer" - Case 0188415501

6. create new layer
7. fill with the same color
8. check it - 70 70 70 70 !!!
9. select background color
10. fill, check - 70 70 70 70!!!

or

6. convert background to regular layer, fill it, check - 70 70 70 70!!!


I believe this is a bug. There is no reason for a different color fidelity in the background and on the same background but with the presence of the additional layer of in the regular layer. Also I was very surprised to hear that it's "expected behavior". If I put in the palette 70K I expect to receive as a result of the fill color 70K, not 69K. And the preparation of layouts for printing I often only one background layer. And not just a document with layers. (Yes, I can then flatten layers into one, but for some reason I can not work on one layer?)
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Maxim Maximov

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Posted 2 years ago

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Photo of Maxim Maximov

Maxim Maximov

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Checked on CS3, CS4, CS5, CS6, CC2015, CC2017

As well as a problem with antialiasing at rasterization pdf problem with the color accuracy on background appeared in CS6

I'm working with Photoshop since version 3, and I was a bit disappointed the concept "of Photoshop is designed to work with layers, but not with the background"