Transicc and also tificc both produce oddly wrong results when
converting near-zero and zero RGB channel values from one RGB matrix
profile to a second RGB matrix profile with a different TRC but the same
colorants (as per converting a linear gamma sRGB image to regular sRGB).
Below are some
Hi,
Could you please send me a private mail with those profiles?
I will take a look.
Regards
Marti
Quoting Elle Stone ellest...@ninedegreesbelow.com:
Transicc and also tificc both produce oddly wrong results when
converting near-zero and zero RGB channel values from one RGB matrix
profile
Hi Elle,
Sorry, with the profiles you sent and transicc from lcms2-2.6, this
does not happen. I got the expected values.
Please check the version of lcms2 you are using.
BTW, -c0 is not needed in lcms2 and may cause problems. This may be
the source of the issue in versions previous to 2.6
I didn't answer to the question on negative zero, so here are some clues.
When using floating point, in general is a bad idea to check for
equality. The internal representation of floating point numbers makes
exact equality problematic. Just as an example 0.1 is periodic in
binary
