Traditional scanner calibration and profiling: 1) Turn off all AI / conversion functions 2) Dynamic range - Use fixed end points for enter white and enter black 3) Establish brutal gradation 4) Automate this calibration routine for each production scan 5) Build input profile 6) Test workflow using fully manual conversions 7) Test automated workflow and compare results by using Photoshop eye dropper. Jon Sent from my iPhone
On May 15, 2020, at 10:14 AM, John Castronovo via colorsync-users <colorsync-users@lists.apple.com> wrote:
An embedded profile cannot change the values. They are what they are unless a profile interprets them differently. What you need to be concerned about is the stability of the scans. If they vary depending upon content or for any other reason, you can't profile that scanner. The other thing that could be raising your numbers is optical flare and that will certainly cause issues. Make sure everything in the optical path is clean.
John C. Techphoto, llc
-----Original Message----- From: Chase via colorsync-users Sent: Wednesday, May 13, 2020 6:58 PM To: colorsync-users@lists.apple.com ; Pat Herold Chromix Subject: Scanner Profiling Issue
Hi, I've been trained to profile digital devices by (after calibration) first turning off all color management meaning no profile application to the output, making a "raw" output and opening it in a profiling application to make an ICC input profile. I'm running into a problem trying to profile a scanner whose software interface will not allow you to turn off the color management on any scan. I was told by the manufacturer to just discard the embedded profile (in Photoshop) prior to creating and opening the now supposed "raw" scan used to make a profile in Xrite or other applications. When tested in Photoshop, the supplied initial embedded profile supplied and recommended to use during profiling by the manufacturer raised all the "L" values about seven "L" so it did change the "raw" values of the scanner for every scan. To my mind, if a "raw" scan is not truly "raw," it will not profile correctly. Testing the resulting new input profile had problems with tone values, gray and color hues. Therefore, their assumption of just discarding a profile in Photoshop will not create a truly "raw scan?" I have not seen it. Any ideas? Is there any way I can traditionally profile this type of scanner? That is the problem I am trying to solve. Thanks for your opinion, Randy ZauchaManaged Color _______________________________________________ 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....
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