Re: i1 Profiler Scanner module, clipping white
Martin replies:
Yes. But I'd blame the scanner for this, not the profiling software :-)
I tried to tame an Epson 10000XL A3 scanner when we were having problems with our Fuji Lanovia.
The Epson software made it really difficult to lock the scanner settings down — meaning that each scanning session would yield different results for the same chart even when you’d made every effort to keep the settings locked and consistent.
Understood. We have replaced our very old 10000XL with the 11000XL. Scanning with “No Color Correction” seems very stable. White patch on Colorchecker is around 240, 241 with no profile of course. When using the “Colorsync” configuration in EpsonScan it is necessary to open the Histogram panel and zero out the auto corrections that the software presents. Annoying. Thanks for the response. Cheers, Barry Rudick Aker Imaging
White patch should be 255 one your target, unless you want some clipping. If you can’t get it that way from the scanner open the patch with no CM in photoshop and use the levels command to just get it there. Then save and import that target into i1Profiler. Doyle
Scanning with “No Color Correction” seems very stable. White patch on Colorchecker is around 240, 241 with no profile of course.
When using the “Colorsync” configuration in EpsonScan it is necessary to open the Histogram panel and zero out the auto corrections that the software presents. Annoying.
Thanks for the response.
On Nov 10, 2016, at 3:30 PM, ygroups <ygroups@dypinc.com> wrote:
White patch should be 255 one your target
This is incorrect. The D1 white patch on a ColorChecker Passport is typically around L*=96, a*=0, b*=4, which is roughly sRGB R=246, G=244, B=236. An ideal capture device is going to be reporting similar native RGB values.
If you can’t get it that way from the scanner open the patch with no CM in photoshop and use the levels command to just get it there.
This is very bad advice, unless the intended workflow is to always apply the exact same channel clipping to all images prior to assignment of the native profile -- which itself is an highly questionable practice. Any half-decent image capture pipeline, whether from a scanner or a camera, is going to offer some method of channel balancing to at least roughly align the neutral axis to the destination space. The consumer ones do it automagically, perhaps with an eyedropper tool to assist the algorithms. Many offer sliders of various kinds to let the user eyeball it. The real stuff lets you specify it explicitly, in addition to whatever user-friendly crutches they might offer. ICC profiles are only going to be truly valid for the exact same actual scene illuminant and software channel balance settings, though many find them "close enough" for a wider range. But a scanner has a built-in illuminant that should be reasonably stable, meaning that the channel multipliers should be set once and forgotten about, and an ideal ICC profile will be equally valid for all scans made from that device. Cheers, b&
Yes. I've been doing the same thing Barry. It's second nature for me to change those end points after every preview, but still annoying that checking 'no correction' never means what it says. Another annoyance is that there doesn't appear to be a way to turn sharpening completely off. I think some is hardwired into the scanner firmware. -----Original Message----- From: Barry Rudick Sent: Thursday, November 10, 2016 5:01 PM To: ColorSync Users Mailing List Subject: Re: i1 Profiler Scanner module, clipping white Martin replies:
Yes. But I'd blame the scanner for this, not the profiling software :-)
I tried to tame an Epson 10000XL A3 scanner when we were having problems with our Fuji Lanovia.
The Epson software made it really difficult to lock the scanner settings down — meaning that each scanning session would yield different results for the same chart even when you’d made every effort to keep the settings locked and consistent.
Understood. We have replaced our very old 10000XL with the 11000XL. Scanning with “No Color Correction” seems very stable. White patch on Colorchecker is around 240, 241 with no profile of course. When using the “Colorsync” configuration in EpsonScan it is necessary to open the Histogram panel and zero out the auto corrections that the software presents. Annoying. Thanks for the response. Cheers, Barry Rudick Aker Imaging _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/jc%40technicalphoto.... This email sent to jc@technicalphoto.com
Hey Barry! Personally I’ve found Epson Scan to be excellent when everything is turned off and CM set to 'No Color Correction'. For some reason I haven’t found the Colorsync option to be reliable when assigning the profile and converting it to the working space, so I always do so in Photoshop and have had fantastic, consistent results doing so. Also, FYI I’ve found Basicccolor Input’s scanner and camera profiles to be an improvement over i1Profiler. Basiccolor Input is brand new software with some neat new technology we haven’t seen anywhere else. These are the small differences that only people like yourself would appreciate! Try it out if you haven’t already. Scott Martin www.on-sight.com
participants (5)
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Barry Rudick
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Ben Goren
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John Castronovo
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Scott Martin
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ygroups