If you create three separate histograms you will see that the red and blue histograms both have a large spike on the left edge because the vast majority of red and blue pixels have a zero component. The histogram you created is actually three separate histograms laid on top of each other which gives the odd-looking, and misleading, colours. Similarly for the green and blue histograms. So, in the red histogram, the leftmost column represents the number of pixels which have a red component of zero and the rightmost column is the number of pixels with a red component of 255. The height of the Y axis represents the number of pixels which have a given colour component. The X axis of the histogram represents this range, with zero at the left edge and 255 at the right edge. It is misleading to combine the three histograms together, especially when the colours are mixed.Įach colour component can have a value ranging from zero to 255. I would post this on the bugs forum and see what the IM developers say. And the largest spike should be green rgb(0,153,0) at 3154 counts.
I don't see any color in the text histogram with a mix of primarily red and blue. It is very odd to me that your largest spike is pink/magenta, which would be a mix of primarily red and blue. NOTE that IM histograms overlay the red, green and blue channels. Gives a similar histogram with a couple more colors showing (at yellow and white at the right side), but the colors are spread over the width of the histogram. convert image -format %c histogram:info:Ĭan you post a link to the subarea you have extracted so others can look at it, if you still need help? Why do you need all the black area around jyeO6.gif?Ĭonvert jyeO6.gif -fuzz 10% -trim +repage -format %c histogram:info:ģ18: (255,255, 51) #FFFF33 rgb(255,255,51)Ĭonvert jyeO6.gif -fuzz 10% -trim +repage histogram:jyeO6_hist.gif
What commands are you using to extract the subarea and generate its histogram? take a look at your text histogram and see how many colors and which ones you get.
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