add profile->profile mode to imgcvt

E.g.

out/imgcvt /System/Library/ColorSync/Profiles/ITU-2020.icc ~/skcms/profiles/mobile/sRGB_parametric.icc
(0, 0, 0) --> (+0.0000, +0.0000, +0.0000)
(1, 1, 1) --> (+0.9998, +0.9998, +0.9998)
(1, 0, 0) --> (+1.2481, -0.3879, -0.1435)
(0, 1, 0) --> (-0.7903, +1.0561, -0.3501)
(0, 0, 1) --> (-0.2992, -0.0886, +1.0503)
(0, 1, 1) --> (-0.8325, +1.0527, +1.0077)
(1, 0, 1) --> (+1.2239, -0.4000, +1.0428)
(1, 1, 0) --> (+1.0312, +1.0035, -0.3791)

Change-Id: Ieb38a3b519f00ae56491c3265ed9725888b692e9
Reviewed-on: https://skia-review.googlesource.com/152360
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed