David Bevan schrieb:
Is there the same performance difference between lcms and Argyll cms with an RGB_8 -> CMYK_8 conversion?
Yes, I get a similar difference: 11.7 (IMDI) vs. 2.1 (LCMS) (sRGB -> EuroscaleCoataed)
Here are my Argyll IMDI numbers for several combinations of input dimensions (id), output dimensions (od), and 8 / 16 bpp (For LCMS I didn't make measurements for all these combinations).
Testing id = 3, od = 3, ip = 8, op = 8 About to create refi About to create imdi Speed = rate = 13.981000 Mpix/sec Worst error = 3 = 1.176471%, average error = 0.051278%
Testing id = 3, od = 3, ip = 8, op = 16 About to create refi About to create imdi Speed = rate = 13.981000 Mpix/sec Worst error = 251 = 0.383001%, average error = 0.031522%
Testing id = 3, od = 3, ip = 16, op = 16 About to create refi About to create imdi Speed = rate = 2.912708 Mpix/sec Worst error = 3 = 0.004578%, average error = 0.000218%
Testing id = 3, od = 4, ip = 8, op = 8 About to create refi About to create imdi Speed = rate = 11.650833 Mpix/sec Worst error = 3 = 1.176471%, average error = 0.054111%
Testing id = 3, od = 4, ip = 8, op = 16 About to create refi About to create imdi Speed = rate = 13.981000 Mpix/sec Worst error = 248 = 0.378424%, average error = 0.033797%
Testing id = 3, od = 4, ip = 16, op = 16 About to create refi About to create imdi Speed = rate = 2.496607 Mpix/sec Worst error = 3 = 0.004578%, average error = 0.000234%
Testing id = 4, od = 3, ip = 8, op = 8 About to create refi About to create imdi Speed = rate = 5.242880 Mpix/sec Worst error = 3 = 1.176471%, average error = 0.040363%
Testing id = 4, od = 3, ip = 8, op = 16 About to create refi About to create imdi Speed = rate = 5.242880 Mpix/sec Worst error = 244 = 0.372320%, average error = 0.021012%
Testing id = 4, od = 3, ip = 16, op = 16 About to create refi About to create imdi Speed = rate = 2.759411 Mpix/sec Worst error = 3 = 0.004578%, average error = 0.000165%
Testing id = 4, od = 4, ip = 8, op = 8 About to create refi About to create imdi Speed = rate = 5.242880 Mpix/sec Worst error = 3 = 1.176471%, average error = 0.043714%
Testing id = 4, od = 4, ip = 8, op = 16 About to create refi About to create imdi Speed = rate = 5.242880 Mpix/sec Worst error = 243 = 0.370794%, average error = 0.022896%
Testing id = 4, od = 4, ip = 16, op = 16 About to create refi About to create imdi Speed = rate = 2.383127 Mpix/sec Worst error = 3 = 0.004578%, average error = 0.000177%
Regard, Gerhard
Btw, it's still unclear, why Auke got so different numbers for LCMS than I did.
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