Image Quality Factors Series: Color Accuracy

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Learn the basics of testing color accuracy, including how to process RAW images, measurement techniques, and how to encode color for human perception.
  1. Imatest LLC
  2. color accuracy
  3. color
  4. testing color
  5. image quality testing
  6. image quality
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Hi,
I am a user of Imatest master. I was analysing a camera using Imatest and I found that Imatest gamma calculation is a little messed up. I observed that Imatest calculated the gamma value by taking the values of log of "Px/255 ideal" to calculate slope instead of taking log of "pixel/255" values. "Px/255 ideal" values are in csv result file. And "Px/255 ideal" values are not ideal. Ideal values according to Imatest should be 0.949, 0.7882, 0.6314, 0.4784, 0.3255 and 0.1922 but the values I got in csv file are 0.957, 0.8388, 0.7192, 0.5944, 0.46, 0.3308 and these values are keep changing for different image that was analysed.
I think Imatest is calculating gamma and exposure error wrong by taking "Px/255 ideal" values for calculation instead of "Pixel/255" values. If I am wrong please let me know why Imatest is taking "Px/255 ideal" instead of "pixel/255" values and also please let me know what actually are "Px/255 ideal" values, since they are not ideal.
Thank you

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