[R] Colorspace: bug in HLS conversion?
Achim Zeileis
Achim.Zeileis at uibk.ac.at
Thu Mar 13 09:43:26 CET 2014
On Wed, 12 Mar 2014, Michael Gauland wrote:
> I just started using the colorspace package, and converting between RGB and
> HLS is not working as I expect. In particular, converting RGB(0,0,0) to HLS
> then back to RGB seems broken:
>
> #> as(as(RGB(0, 0, 0), "HLS"), "RGB")
> R G B
> [1,] 1 1 0
>
> That is, converting black to HLS then back again produces yellow!
I can't reproduce this. I get 0,0,0 as expected.
> Other values I've tried work as expected (i.e., I get the same RGB value out
> as I put in).
>
> Is this a bug in the code, or in my understanding of colour conversions?
Maybe you are using an old version of "colorspace"? For version 1.1-1
(from two years ago, version 1.2-4 is current) the NEWS file says:
o Bug fix in HLS_to_RGB conversion for s == 0.
> Kind Regards,
> Mike
>
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