Re: How to calculate the Colordifference Delta E with ImageJ ?
Posted by Peter van Loon on Nov 19, 2014; 7:54am
URL: http://imagej.273.s1.nabble.com/How-to-calculate-the-Colordifference-Delta-E-with-ImageJ-tp5009612p5010536.html
Hi Matzu,
Picture number 3 (the red one) is clipped. I made a RGB stack from picture 3 and then used the HiLo lut (blue = 0 and red = 255) to show it (see added pictures).
In the red channel 9 patches have values higher then 255. In the blue and green channel some patches are underexposed (zero values). If you want to measure the color it is important to prevent clipping. Because of your quite extreme red color light you have both: over and under exposure. Try to get the dynamic range of all channels between 1 and 254 or use patches that are not clipped: # 3,5,6,11,21,23 (order: top left to bottom right).
Peter
URL: http://imagej.273.s1.nabble.com/How-to-calculate-the-Colordifference-Delta-E-with-ImageJ-tp5009612p5010536.html
Hi Matzu,
Picture number 3 (the red one) is clipped. I made a RGB stack from picture 3 and then used the HiLo lut (blue = 0 and red = 255) to show it (see added pictures).
In the red channel 9 patches have values higher then 255. In the blue and green channel some patches are underexposed (zero values). If you want to measure the color it is important to prevent clipping. Because of your quite extreme red color light you have both: over and under exposure. Try to get the dynamic range of all channels between 1 and 254 or use patches that are not clipped: # 3,5,6,11,21,23 (order: top left to bottom right).
Peter
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