Marco Ugolini wrote:
> "Tonal discontinuities" such as which, exactly?
Sorry, I suppose there are no "discontinuities" in the luminous
landscape max-for-each-hue-and-luma, but neither will there be in the
same thing piped through a CMM and printed. What I meant to say is
that the function is not smooth (continuously differentiable), and in
particularly noticeably has a nasty diagonally slanted edge in
lightness (L*), where the derivative changes abruptly. This visual
artifact is clearly visible
don't understand why it wouldn't make more sense to create test images
with lightness rather than luma on the vertical axis, especially
considering that most CMMs use CIELAB as a PCS. I suppose it would
take crunching some numbers to make such a test image, and wouldn't be
quite as easy to manage in Photoshop.
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