[R] Colorspace: bug in HLS conversion?

[Pascal Oettli]

Hi,

I cannot reproduce your result:

R> as(as(RGB(0, 0, 0), "HLS"), "RGB")
     R G B
[1,] 0 0 0

You probably should provide the output of sessionInfo().

Regards,
Pascal



On Thu, Mar 13, 2014 at 7:41 AM, Michael Gauland <mikelygee at amuri.net> 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!
>
> 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?
>
> Kind Regards,
> Mike
>
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-- 
Pascal Oettli
Project Scientist
JAMSTEC
Yokohama, Japan