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Try converting your color list from RGB format to HSV format and then sort the HSV list. What program did you get the RGB values out of? You might be able to tell it to simply report out HSV values. If you can't get HSV directly from that program, you could convert RGB to HSV here http://www.rapidtables.com/convert/color/rgb-to-hsv.htm Background: RGB ...


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Export the image from Data View. Check the Write World file in the general tab. There you can also control the image output resolution and size. Image quality of the output will be compromised either way because you have georeferenced the image and thus altered/warped or stretched the original pixels. Work out the outptut size and resolution that closely ...


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This does not probably work generally but it should give a correct result in your case. I captured your image above and saved it as "pngtest.png". I checked that it is a RGB png file with alpha channel. However, because it looks like a classified image I decided to try what happens if I convert it into a paletted tiff with GDAL tool rgb2pct.py ...



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