Recognize specific color area of an image (measure the width of a tree trunk from a photo)

[Patryk_F]

Theoretically, it can be done. In practice, it doesn't really work.
Look this topic:

Help getting RGB Values using GetBackgroundPixelColor

Hello all, I have been stuck on a problem with getting RGB values from a canvas image that is 32x32. [rainbow-grid] When I run through a For loop to try and extract the first line of values (on the y axis) it gets values but they are strange. The first red value on the top left should be 255, and the second 195, the third 255 and this should alternate for at least 10 pixels. The values I get reported back are: 255 255 255 195 195 195 195 255 255 255 255 195 If I increase the y …