Below steps were followed for evaluating the sRGB color reproduction capability for the CP800.
a. The 24-color checker image was converted to sRGB color space, and saved in jpeg format.
b. The RGB reference values were extracted from the jpeg image.
c. The jpeg image was printed out with Canon Selphy Print utility.
d. The color patches of the printout was measured with a spectrometer.
e. The reference and the measured values were compared with PatchTool using ΔE2000.
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What is ΔE Color Difference
CIELab is perceptually uniform color space and the beauty is that it enable us to compute mathematically the distance between 2 colors that represents how close they are in the color space. In general, and subjectively speaking,
1 ΔE: threshold of what is just perceptible to the human eye.
3 ΔE: detectable by color professionals or an trained eye.
6 ΔE: often considered acceptable for printed material.
Other reference link
Color performance test by printerinfo.com
a. The 24-color checker image was converted to sRGB color space, and saved in jpeg format.
b. The RGB reference values were extracted from the jpeg image.
c. The jpeg image was printed out with Canon Selphy Print utility.
d. The color patches of the printout was measured with a spectrometer.
e. The reference and the measured values were compared with PatchTool using ΔE2000.
 |
| Comparing Reference values and Measured data Color Difference was calculated with ΔE2000 |
CIELab is perceptually uniform color space and the beauty is that it enable us to compute mathematically the distance between 2 colors that represents how close they are in the color space. In general, and subjectively speaking,
1 ΔE: threshold of what is just perceptible to the human eye.
3 ΔE: detectable by color professionals or an trained eye.
6 ΔE: often considered acceptable for printed material.
Other reference link
Color performance test by printerinfo.com
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