Hi, this sounds quite interesting and is the kind of thing that is cool to have. So, no immediate needs but I guess it will be very useful at some time to me. Ingo
On 2017-02-15 07:17, Craig DeForest wrote: > Is there a general desire for this subclass of Transform? I’m coding it up > for some other projects. It is intended to be, for color representations, > sort of what PDL::Transform::Cartography is to map projections. > > At the moment it’s living in my localpdl github tree, but I’d be happy to > either spin it out as a CPAN module or merge it into the PDL::Transform part > of the distribution, if there’s general interest. > > The module handles conversions from normalized RGB (floating point on [0,1]) > to/from CMYK, HSV, HSL, and HSI. It also handles bRGB, and bCMYK (floating > point or byte values on [0,255) ). More color representations are planned. > Gamma correction is fully supported. > > The idea is that you can, e.g., say things like: > > # simple CMYK conversion > $im = rpic(‘mypic.png’); # read bytes > $im_cmyk = $im->apply( t_cmyk x !t_brgb ); # convert to normalized, then > normalized CMYK > > # Fancy CMYK conversion with different gamma representations for screen > and ink; byte output > $im_cmyk_fancy = $im->apply( t_cmyk( b=>1, gamma=>2, htgamma=>0.7 ) x > !t_brgb; > > # improve saturation in an image without affecting brightness > $im = rpic(‘mypic.png’)->apply( !t_brgb ); # read and convert to nRGB > $im_hsv = $im->apply( t_hsv ); # convert to > hue/sat/brightness > $im_hsv->((1)) *= 1.5; # increase saturation > $im2 = $im_hsv->apply( t_brgb x !t_hsv ); # convert back to byte RGB > > If there’s interest, I’m willing to push it out — but if not I’ll probably > sit on it for a while. > > Cheers, > Craig > > > > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > pdl-devel mailing list > pdl-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pdl-devel ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ pdl-devel mailing list pdl-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pdl-devel
