HCT can better characterize a scanners performance in deep shadows,
More evenly throughout, the medias available color space.Įmphasis is given to very dark patches, both colored and neutral, so the Seeks the widest dynamic range and color gamut possible with the baseĬolorimetric values are approximately proportional to, and distributed HCT specification does not define colorimetric values for any patch, but Over 500 discrete patches the HCT contains around twice as many samplesĪs the IT8s 252 (Kodak) or 288 (Fuji & Agfa) patches. HCT was designed specifically for scanner profiling. Later for scanner profiling with virtually no redesign. IT8 was designed in the 1980s as a visual scanning guide. Is chosen for general use, pick the one on the film type you scan most often.ĭifferences from the IT8.7/1 /2 scanner target Scanners, but other scanners like the ICG drum scanner and most CCD desktop scanners require custom Ektachrome or Fujichrome profiles for precise color matching. Quite accurately on Heidelberg (Hell) 3000-series and Fuji (Crosfield) Drum To size from 8x10 inch sheet film and are not created on actual 35mm or 120 film, however because similar dyes are used in all product sizes, they produce equivalent results.Įither Fujichrome or Ektachrome HCT targets reproduce Agfachrome, Ektachrome and Kodachrome originals (2 1/4 x 2 3/4 inch) Ektachrome and Fujichrome.įujichrome (35mm Ektachrome discontinued until further notice). The HCT is currently available in the following formats. Results compared to profiling with an IT8 target. Improvement than drum scanners, however high-end flat-bed scanner users report
IT8 TARGET MANUAL
If the subject matter's colorants have different spectral curves, accuracy may be limited by "metamerism failure", for which there is no simple solution except manual editing in Photoshop.įlatbed (CCD) scanners with serious opticalįlare or uneven illumination may show less The amount of improvement can be influenced by scanner setup, viewing conditions, subject matterĪs with all camera targets, HCT profiles are optimized for the dyes or colorants in the target itself. ToĬompare results from the HCT and IT8 target, click here.įor Photographers the HCT provides a much higher dynamic range and wider color gamut than typical camera targets, allowing a greater portion of the camera's color space to be characterized. This translates into more precise scans and better correction of underexposed originals. HCT yields more precise color and tonal accuracy, especially in richly-saturated colors and very dark shadows. Of dark colors and three times as many gray scale steps as standard IT8.7/1 and IT8.7/2 targets, the HCT can characterizeĬameras and scanners more accurately, especially in rich colors and dark shadows. See Ken Rockwell's humorous treatise on this subject, "Color Management is for Wimps".Overview The HutchColor HCT is a high-precision, individually-measured ICC profiling target for demanding scanner I did use the IT8 target to develop my own "starting point" settings that I apply to all scans, and almost always get satisfactory results. I now scan everything with pretty much "default" settings, and adjust manually in photoshop.
Do turn off the autoexposure feature, which often produces odd results.Īt the same time, I have found that automatic profile correction is not what it is all blown up to be, because the scanned result ultimately has to match our perception of the image, rather than what it "objectively" looks like, and there are so many variations like base color, paper color, monitor color, etc.
I very strongly recommend VueScan it has a somewhat user-unfriendly interface, but is a very capable, flexible, reliable program.
IT8 TARGET SOFTWARE
The adjustment is done by the scanning software itself, which means that the scanning software has to have the capacity to do this by the time it reaches Photoshop, a lot of the dynamic range is already lost.
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