Colors of an image contained in another image

[YvesTan]

Hello,

I wish to make the following comparison:

On one side, I have a simple image (A) which contains certain colors :


On the other hand, I have another image (B) that contains a color palette :


I want to know if the dominant colors in image A are contained in image B

how do I proceed?

thank you

(french user : sorry to my bad english)

[fmw42]

see -unique-colors or just use the histogram

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convert image -unique-colors  txt:-

http://www.imagemagick.org/Usage/quantize/#extract
http://www.imagemagick.org/Usage/files/#histogram
http://www.imagemagick.org/script/comma ... que-colors

[YvesTan]

Thank you for your answer

I tried:

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convert image_B.gif -colors 256 -depth 8 -format "%c" histogram:info:

And loop on results and push HEXA on database

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convert image_A.gif -colors 256 -depth 8 -format "%c" histogram:info:

And loop on resultst and compare each HEXA with image B results on database

But I think the problem is that I use a limited palette too? Not enough intervals colors?

[YvesTan]

Maybe I'm not using the right method.

The project is:

- Taking a picture of a liquid for analysis (like this: http://www.poolplaza.com/pool-school/pH_testing.shtml)

- We try to determine in which areas of the range "red phenol" the liquid is (negative, not determined, positive)

Thank you for your advice

[snibgo]

Perhaps you have a sample colour patch and want to find that in the colour chart of pH values.

So, scale your sample to a single pixel. Then do a subimage-search for that pixel in the colour chart o find the closest match.

[YvesTan]

Hello,

My apologies for the response time. I solved my problem by calculating the distance Delta E

Thank you for your ideas