I am new to color management, so please bear with me if I'm asking dumb questions. I have noticed that pictures scanned in from my scanner (HP Scanjet 5590) end up with radically different colors when displayed on screen, than they do on paper. I assume that I can characterize the scanner, then use that information to remap the scanned images into something that looks right on screen. I'm not looking for something incredibly precise, just to have flesh-toned skin. The Autocorrect settings in the scanner software, well, don't. I've created a test target with targen and printtarg to a TIFF file. But before I took this into the physical world, I wanted to see how the rest of the image processing would go. My overall plan is to take the target down to my local photo print place and get something that's "close enough" to what's on the screen that I'm satisfied. targen -v -d 2 target4 printtarg -i SS -v -a .4 -t 300 -p 4x6 -s -m 10 target4 scanin -dipn -v1 target4.tif target4.cht target4.ti2 diag.tif The target I've created (through the various steps) can be found at http://content.iegrec.org/target4.zip When I feed the target.tif back into colprof, however (which I think should create a null ICC profile, i.e. one that makes no changes to the color space, however looking at the curves in the ICC Profile Inspector, they are not flat at all. Looking at the TI3 file, the deviations are very small (<10^-13). But colprof -v has a very interesting idea of what "White" is in this case: target4>colprof -v target4 No of test patches = 836 Estimating white point Picked white patch 283 with XYZ = 0.907340 0.982510 0.858160, Lab = 99.319739 -7.096156 -3.825529 Picked black patch 5 with XYZ = 0.010000 0.010000 0.010000, Lab = 8.991442 1.317040 -2.855386 Approximate White point XYZ = 0.907340 0.982510 0.858160, Lab = 99.319739 -7.096156 -3.825529 As you can see from the RGB values it picked, it is nowhere near a pure color (the choice of black is a lot closer to black). Guessing from the lines in target4.TI3, it's looking at patch V06 which is RGB FFFFe1 not FFFFFF. Am I missing something in this process? Is it a futile quest to try to get a 1:1 ICC profile out? Why is colprof not going with the true white patch at R10, R11, Q19, or R12? Thanks, --Joe