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
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