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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
