HCT User Guide
page 36
Copyright © 2001 HutchColor, LLC
User_Guide_43.docx 2/10/19
35mm reference files
Q: Why can't I find a reference file with the same number as my 35mm target?
A: 35mm targets are produced in small batches of about 25 at a time, all cut from a single sheet of
8x10 inch film. Use the reference file whose two code numbers encompass yours, e.g. 35mm
target number 6018 uses reference file number ‘6000-6028’
Really weird results in any software
Q: Why are my HCT profiles giving weird colors and/or a high error report?
A: Sounds like you cropped the target wrong in the profiling software. Nothing spoils a scanner
profile quicker than incorrect cropping. Maybe you used the wrong reference file. Go back and
create the profile again and pay close attention to cropping and selecting the correct reference
file. If that doesn’t solve the problem, check your scanner settings. Did they change between
capturing the target and scanning live work?.
ColorBlind software problems in saturated colors
Q: I made a profile with ColorBlind Professional but it seems to be wildly inaccurate in very
saturated colors. Is this a fault in my HCT or the reference file?
A: Neither. It’s a fault in the ColorBlind software. Whether you profile with the IT8 target or the HCT,
ColorBlind Pro scanner profiles often exhibit reversals or false color if presented with RGB values
outside the range of the target scan. This can be tested by assigning the scanner profile in
Photoshop to the RGBXPLORER test image at
www.hutchcolor.com/
Images_and_targets.html/
. The problem can be reduced by lowering the quality setting from 4
to 3 or 2, but with a subsequent loss of profile accuracy. For best results use another software.
ColorBlind software problems in grays
Q: How can I reduce the gray balance error I’m getting with ColorBlind HCT profiles?
A: Switch off “Gray Correction” in the dialog just prior to saving the profile. To see the dialog box in
versions prior to 4.0, hold down C Option before clicking Create.
Patches with a checkerboard pattern
Q: Upon enlarging the HCT test scan to check for dust I noticed a faint pixelation pattern in some
patches. Should I send the HCT back for replacement?
A: No, everything is normal. Some HCT patches may contain a low contrast checkerboard pattern,
noticeable under magnification or in the test scan. This pattern is INTENTIONAL and does not
reduce the target’s performance. Do NOT try to eliminate the pattern by blurring or cloning as
that will reduce the quality of the profile.
Digital camera problems
Q: Why can’t I get a decent camera profile?
A: The most likely causes are reflections on the target surface, or uneven lighting. Take great care
to light the target evenly and make sure there are no reflections on its surface. An easy way to
test this is to place a mirror or piece of shiny black plastic in place of the HCT, look through the
lens or make a capture of this ‘reflection tester’ and move it around till it shows no reflections,
then replace it with the target.
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