What Photoshop fill for 18% grey card?

Started Dec 16, 2005 | Discussions thread
NAwlins Contrarian Veteran Member • Posts: 5,260
Re: The bottom line......

is that I would like to meet the person that can print with an inkjet printer a “true” 18% gray compared to a commercial gray card (ColorChecker). Just produce a color in PS using any one of the suggested numbers, print it with many different printers and you will have many different looking shades of gray prints. Matte papers versus luster, satin, gloss are also going to look different.

Agreed. Trying to print a gray card (except as a curiosity / exercise) seems like a bad idea, probably relatively high complexity for low quality.

Also, I have multiple gray cards, and I'm not confident they are even super-close to each other.

Later today I will spot read my Xrite ColorCheckers 18% patch using my I1Pro’s just to see what Lab and RGB values are indicated.

One thing that surprised me to learn was that the gray patches along the bottom row / right column of a ColorChecker are not designed for being neutral enough to white-balance on. With the ColorChecker Passport, there are two tiles on the opposite side with dished-in sides that are intended for neutral white-balancing:

The other tiles on those columns (in this view) are for, e.g., warming a portrait.

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