Thread: [Lcms-user] Quality of a scanner profile
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From: Xavier N. <xav...@fr...> - 2004-04-17 15:26:59
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Hi again, Is there a way to evaluate the quality of the profile I = generated for my scanner?=20 - I understand that the 'dE report' reflects the quality of my scanner, rather than that of my profiling process. By the way, using 33 CLUT points and Local convergence analysis, I got=20 Average dE: 2.51 Standard deviation: 2.26 Peak: 14.64 Min: 0.32 Are those typical values? They're much larger than the = examples given in the MANUAL.TXT file... - I've made available the CIE diagram given by the checker for = this profile at: <http://xavier.nodet.free.fr/CIEdiagram-HP1210.png> I'm concerned by what seem to be quite large errors in the = blue area: different patches seem to have very different = corrections (if I understand the meaning of this diagram correctly). Is = that the sign of errors in my profiling process? Thanks. --=20 Xavier Nodet "They that can give up essential liberty to obtain a little = temporary safety deserve neither liberty nor safety." - Benjamin = Franklin, 1759. |
From: Gerhard F. <nos...@gm...> - 2004-04-17 16:49:32
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Xavier, which LCMS profiler are you using? The old, open source one, or the new one (which runs on Windows only, and is no longer open source)? Regards, Gerhard Xavier Nodet schrieb: >Hi again, > >Is there a way to evaluate the quality of the profile I generated >for my scanner? > >- I understand that the 'dE report' reflects the quality of my > scanner, rather than that of my profiling process. By the way, > using 33 CLUT points and Local convergence analysis, I got > > Average dE: 2.51 Standard deviation: 2.26 > Peak: 14.64 > Min: 0.32 > > Are those typical values? They're much larger than the examples > given in the MANUAL.TXT file... > >- I've made available the CIE diagram given by the checker for this > profile at: > > <http://xavier.nodet.free.fr/CIEdiagram-HP1210.png> > > I'm concerned by what seem to be quite large errors in the blue > area: different patches seem to have very different corrections > (if I understand the meaning of this diagram correctly). Is that > the sign of errors in my profiling process? > >Thanks. > > > |
From: Xavier N. <xav...@fr...> - 2004-04-17 16:55:27
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On Sat, 17 Apr 2004 18:42:42 +0200 Gerhard Fuernkranz = <nos...@gm...> wrote: Hi Gerhard, > which LCMS profiler are you using? The old, open source one, = or the new=20 > one (which runs on Windows only, and is no longer open = source)? I tried both, and got the same kind of result in each case. But= this one was generated using the new version (beta 3). Regards, --=20 Xavier Nodet "They that can give up essential liberty to obtain a little = temporary safety deserve neither liberty nor safety." - Benjamin = Franklin, 1759. |