What Photoshop fill for 18% grey card?

Started Dec 16, 2005 | Discussions thread
NAwlins Contrarian Veteran Member • Posts: 5,260
Depends on use
1

Using Adobe RGB the values should be (117,117,117).

Does the exact value really matter? For production work it does but then you will not print your own card.

How much or even whether it matters really depends on what you are doing. It is not clear to me what the OP--way back in 2005--was trying to do.

IMO the more important point was that MU84's claim that "Photoshop fill for 18% grey card [is] RGB: 124,124,124" is simply wrong, and the two people who upvoted that are not aware of some important qualifiers, and are endorsing a misunderstanding / wrong statement. RGB values only define colors in reference to a specific color space (like sRGB or Adobe RGB), and most color spaces are not linear, instead having a gamma (some of which are a slightly-complex function). It would be better for people to know these things, and understand the limitations of all of this.

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