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UltravioletPhotography

Color count


rfcurry

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What information can we derive from color count? I have been taking UV reflectance photos with different UV bandpass filters. Sometimes the difference between the images is remarkable, sometimes it is very subtle, but there is one constant; one of the filters has a color count 10K to 30K greater than the other.

 

So, what, if anything, does the color count mean in practical terms.

 

Thanks in advance.

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Some of my freeware image processing programs do a count of the unique colors in an image. One considers the count as an image property:

************

Image properties

Image name : Gen3-318.jpg

Folder : C:\Users\Reed\Google Drive\Filters\Sunflowers

Size : 4000 x 3000 pixels ==> 22.22 x 16.67 inches (180.00 dpi)

Color count : 97832

File size : 1.33 Mb

Date : 12/10/2018 1:21 AM

 

EXIF

Make=Panasonic

Model=DMC-GF1...

etc.

*******************

 

Another program has color count as a plugin. It shows the unique colors of the image above as

Unique colors: 98806

 

a difference of 974 colors.

 

I don't know how the color count is typically used.

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