What Photoshop fill for 18% grey card?

Started Dec 16, 2005 | Discussions thread
Guillermo Shashte Contributing Member • Posts: 950
Re: Depends on use

So for setting White Balance in Photoshop does it matter?

I asked Robin Myers, who used to sell the plastic DGC-150 digital card and this was his reply:

As for the L*a*b* and RGB values, they changed slightly for each batch of plastic we received, and the type of light exposure and handling will have an effect on the values. So any numbers I supply are NOT exact. Your card will be slightly different.

For one of the last batches of cards we made in 2010, here are the averages. L* = 65.1, a* = -0.4, b* = -0.4. The average sRGB is 156, 157, 155; Adobe RGB is 156, 157, 155.

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