Pixel counting? Or area computation?

[allenbham]

Is there any way to figure out how many pixels of a certain color exist in a jpg file? 

Or alternatively, what percentage of a file's pixels are a certain color?

I'm trying to figure out the total surface area of a group of oddly curved, organic shapes.

[firstdefence]

I doubt that's possible in any of the Affinity apps. There are image analysis/forensic apps that would be better suited to your question, namely ImageJ: https://imagej.nih.gov/ij/ this is another release of ImageJ: https://fiji.sc

[v_kyr]

1 hour ago, allenbham said:

Or alternatively, what percentage of a file's pixels are a certain color?

See for example:

• Image colour summarizer
• http://mkweb.bcgsc.ca/color/
• Introduction to countcolors package
• Color Identification in Images

... and similar sites with such tools and packages.

 

[allenbham]

v_kyr, thank you --- this was just what I was looking for and I had no idea it existed as its own separate service.  It's easy and directly suited for what I'm doing here.