So, i have two images CMYK/8 bit to one image I set color #00ade3 to a shape, I then do the same to the other image (also same shape, just bigger) and it forces my color to #04ace3 instead, no way to set the color that I want.

To note that the color I'm trying to set does not receive any warning (gamma) I also noticed that if I set it using C(99) and Y(5) it works and receive the color.

So its not a real problem, I'm just wondering why two identical images behaves differently, maybe there is some setting I don't know?

edit: using Adobe Kuler I noticed something weird: I enter my color #00ADE3 and it gives a CMYK (100,24,0,11) which is a lot darker.

  • Your'e mixing CMYK with RGB. Hex numbers are an RGB value. what at the CMYk values? And How are you determining the color? Eyedroppers? If so, what's the sample radius for the eye dropper?
    – Scott
    Commented May 28, 2017 at 19:25
  • It also sounds like you are confusing 'gamma' with 'gamut'.
    – Westside
    Commented May 28, 2017 at 19:31
  • @Metis,@Westside I open the shape -shape- symbol in its layer with double click and set the color, I confirm and re-open and the value changed, If I set C and Y values then change the RGB color the color is preserved. Yes I confused gamut with gamma! :) Commented May 28, 2017 at 19:41
  • 1
    Not sure what you aren't understanding where HEX is concerned. Using HEX values will almost never give you accurate CMYK values. as I've posted... HEX is RGB.
    – Scott
    Commented May 29, 2017 at 0:22

1 Answer 1


After above comments...

By using Hex values to set a color in a CMYK file, you are asking Photoshop to convert that RGB color to a CMYK color. So there can be a shift based upon color profiles.

If you input C and Y values, you aren't asking for any conversion, you are adjusting values directly.

That is why you are seeing a difference.

If you're working on CMYK files and color is critical, don't rely on RGB values for colors.

  • why when I enter RGB it doesnt update the corresponding CMYK values in the color selection tool? edit: color profile is the same in both images. Commented May 28, 2017 at 21:41
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    Because the color picker is part of the operating system not Photoshop. While Adobe has integrated it a great deal in Photoshop (not so much in other apps), it still doesn't even see the image color profile until you close the picker -- and Photoshop reads the values and applies them.
    – Scott
    Commented May 29, 2017 at 0:21

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