Re: Do I need to upgrade to i1Profiler?
Re: Do I need to upgrade to i1Profiler?
- Subject: Re: Do I need to upgrade to i1Profiler?
- From: Andrew Rodney <email@hidden>
- Date: Thu, 07 Apr 2011 15:04:55 -0600
On Apr 7, 2011, at 2:52 PM, Bruce Andrew Jamieson wrote:
> But that is the problem: those swatches were meant for cameras and not printers.
Not really. Yes, the ColorChecker can be used for making a DNG profile. But the target, its colors and manufacturer go back way farther than even ICC color management! Its been a visual reference for film for decades.
> Another troubling thing that I see, at least from the photo on your site, is how off the grays are.
Take the visual match (or mismatch) here with a grain of salt. The idea was to show what the target over a print looks like. In fact, that’s not even how the shipping version appears (I’m still waiting on one). I simply placed the target over a print, slapped it into a GTI booth and took a quick shot with my 5DMII. So there’s all kinds of metameric failure here and the idea is NOT to show a match or mismatch, only what the two look like in the roughest manner. If you view the print behind the target, its a decent match for most of the patches. IOW, consider this a screen capture on a web page illustration, nothing to use to judge the quality of a match.
> Also, for the "smoothness" slider: I feel that you may get a different result if you test printed a black-to-white gradation instead of solid swatches. I would imagine the purpose of that slider is to improve the reproduction of smooth gradients: seeing any delta E change when messing with that slider would defeat the whole purpose!
So I can build two profiles using both options, make a print using each and you see no difference on the output. There is a spectral gradient in the test image and it t looks identical with both profiles. The differences with the two settings and profiles is simply invisible!
What I then did was take 918 color patches distributed through color space, and ran the profile on both sets. Both images with these patches was then imported into ColorThink. It was used to build two color lists so I can look at the deltaE of all such patches. The max dE for the single worst match (meaning the one color most affected) was less than 1. So to see how much the slider affects the profile (and remember this is the extreme of both ends of the slider), I applied them onto color patches so I can get a value in dE.
The bottom line was visually and numerically, the slider does next to anything.
Andrew Rodney
http://www.digitaldog.net/ _______________________________________________
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