Re: Colorchecker SG and Scanner Profiling
Re: Colorchecker SG and Scanner Profiling
- Subject: Re: Colorchecker SG and Scanner Profiling
- From: Robin Myers <email@hidden>
- Date: Tue, 17 Aug 2010 13:56:28 -0700
When scanning items other than photo materials, depending on the scanner hardware and the methods used in making the profile, the ColorChecker SG can make a better profile than the IT8.7/2 target. The reason is that the IT8 chart is comprised of only 3 colorants, where the ColorChecker SG (96 unique patches) has, by some estimates, since X-Rite does not state, more than 10 colorants. This results in better spectral sampling if your originals are not photo prints.
If you are scanning only photo prints and transparencies then using the appropriate IT8.7/2 print is better. Appropriate here refers to Agfa IT8 for Agfa prints, Kodak IT8 for Kodak prints, etc. After all, the IT8.7 charts were specifically designed for scanning photo prints and transparencies, but they were never purposed for scanning anything else due to the limitations of 3 colorant targets.
Robin Myers
On Aug 17, 2010, at 12:10 PM, Marco Ugolini wrote:
>
> The Digital ColorChecker SG has 140 patches (many of them repeats of white, middle gray and black, hence with an even lower number of effectively unique colors); the IT8 target has 288 patches, each of them unique.
>
> What is the rationale behind using a considerably smaller set of patches to create a (supposedly) better scanner profile?
>
> Marco
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