Hello, Graeme. Can You take a look on the device (TI3 attached in archieve)? Perceptual and Saturation intents in ArgyllCMS profile are OK, but relative intent is quite strange: there is lightness inversion at the black side of a gray gradient. I know that the device is behaved bad. But I didn't expecting that there will be lightness reverse at a black side. See the boxes below the 8..18 numbers in Test_relative.png attachment. It seems that the black point is lighter than some intermediate dark gray. I'm searching a way how to achieve a uniform gradient with relative intent.
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Diagnostic plot.PNG
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Test_relative.png
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