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Re: Color Charts for Mars

Re: Color Charts for Mars

Mitch Gross

While a grey card is a great tool, there is something to be said for a chart also displaying either red/green/blue or yellow/cyan/magenta. (Note the ‘also’ as a white/grey neutral reference is always worthwhile.)

As pretty much all of us work with RGB sensors (Bayer or otherwise), a three color chart can tell you how well each channel is saturating, getting polluted from a separate color, is performing in dynamic range, is performing in sensitivity, is showing noise, is clipping, etc. If the levels are particularly off, the way the image is processed can be adjusted to help compensate. For us old fogies, it can be like cooking the bath at the lab or maybe fogging the neg. 

Mitch Gross
New York

On Feb 28, 2021, at 4:36 PM, John Brawley <john@...> wrote:

A grey card seemed to work well for a long time….

John Brawley ACS
Los Angeles

On Feb 28, 2021, at 1:10 PM, Noel Sterrett <noel@...> wrote:

Thanks, great sites. Makes my chart knowledge seem totally inadequate.

Maybe we should to move to using charts with only 3 or 4 colors? That's all NASA seems to need.

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