[Octave-bug-tracker] [bug #45456] hsv2rgb is very strict about its input values

[H. G.]

Follow-up Comment #5, bug #45456 (project octave):

I would like to suggest the following change to those 3 functions:

* Use a tolerance of tol=2e-10 . This tolerance is slightly smaller than
2^(-32) and so I would expect no visible changes to 32 bit images or to images
with less precision. (I don't know of images with even higher bit depth.) I
would assume that +-eps is too tight a tolerance here. And using the suggested
value for tol would still make sure that only negligible changes to the data
are done.

* Silently clip the double input data to 0 if it is in the interval [-tol ,
0]. And silently clip the input data to 1 if it is in [1, 1+tol].

* Issue a warning if the input values are outside [-tol , 1+tol]. But do
proceed with the function anyways (for Matlab compatibility).

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