[Octave-bug-tracker] [bug #50429] image package: xyz2lab changed slightly in Matlab (and other color conversion functions)

[Hartmut]

Follow-up Comment #1, bug #50429 (project octave):

my personal comments:

* Matlab has "recently" (Matlab V2016a) slightly changed its color conversion
functions in the image toolbox. See this link:
https://de.mathworks.com/help/images/release-notes.html?rntext=&startrelease=R2016a&endrelease=R2016a&searchHighlight=conversion

* So the remark about Matlab's D65 values in comment #0 might well be correct.
So this is a slight Matlab incompatiblity.

* Nevertheless, my intention in writing those color conversion functions in
the Octave image package was never to be perfectly Matlab compatible. The
current results are *mostly* Matlab compatible (maybe only to Matlab version
before V2016a), but the have a better "round trip accuracy" than Matlab had at
that time. See "help rgb2lab" for some more detail on this.

I have no objections to making the Octave color conversion functions even more
Matlab compatible, also to the newest Matlab version. But I myself won't find
the time to do this in the forseeable future.

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