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A few weeks ago, or months or eons, someone posted a problem he was having with an image that looked different in CS3/CS4. It turned out he didn’t explain or post the right image and it led to one of those eternal threads by the usual suspects.
Anyway, he had posted a side by side and I told him the left hand one was blue. It was actually a 10,10,10 fill.
Of course everyone told me that I was nuts and had a bad monitor profile, and since i am never wrong, I said that something else must be the problem because my grey scale test targets were fine etc etc. I went to drycreek and looked at Norman Koren’s grey scale, and whoa! the very dark step above black was blue. Here’s where it gets odd. I was looking at it in Preview or Safari and it was damn sure blue. I opened it in CS2 and it was grey. I already knew or thought I knew that ColorSync has some problems. It puzzled me, though.
G Ballard had posted the PDI target because of some other thread and i had put it in my rendering intent folder, The other day I finally felt like pursuing dumbass minor irritations and opened it in Preview. The 18,18,18 step was blue, but only that step. I copied the PDI and opened that in CS2 right next to it. Preview (ColorSync) blue. CS2 grey.
You already know I’m too broke to buy expensive stuff and I use SuperCal for monitor profiling. I don’t sell anything but my feeble brainpower on the web and my prints are just for me and family so WTF. SuperrCal has never given me any grief and i think it is an excellent product for the amateur.
My point?
Several things:
1. Don’t trust ColorSync. I.E. don’t trust Preview or Safari. I refuse to upgrade FireFox to 3 for other reasons, like my paycheck.
2. This is pretty certain to be a problem with the way ColorSync approximates gamma correction at both the high and low end, and Photoshop uses a better method.
3. People use the expression gamma when they mean gamma correction and they also don’t realize that the gamma correction is only an approximation at the low end to prevent blocking up and at the high end because of saturation.
4. I’m always right.
5. SuperCal has a method of correcting the individual color gammas which is more difficult for blue. This may be due to the typical problems with blue such as low signal to noise ratio.
Let the games begin.
Anyway, he had posted a side by side and I told him the left hand one was blue. It was actually a 10,10,10 fill.
Of course everyone told me that I was nuts and had a bad monitor profile, and since i am never wrong, I said that something else must be the problem because my grey scale test targets were fine etc etc. I went to drycreek and looked at Norman Koren’s grey scale, and whoa! the very dark step above black was blue. Here’s where it gets odd. I was looking at it in Preview or Safari and it was damn sure blue. I opened it in CS2 and it was grey. I already knew or thought I knew that ColorSync has some problems. It puzzled me, though.
G Ballard had posted the PDI target because of some other thread and i had put it in my rendering intent folder, The other day I finally felt like pursuing dumbass minor irritations and opened it in Preview. The 18,18,18 step was blue, but only that step. I copied the PDI and opened that in CS2 right next to it. Preview (ColorSync) blue. CS2 grey.
You already know I’m too broke to buy expensive stuff and I use SuperCal for monitor profiling. I don’t sell anything but my feeble brainpower on the web and my prints are just for me and family so WTF. SuperrCal has never given me any grief and i think it is an excellent product for the amateur.
My point?
Several things:
1. Don’t trust ColorSync. I.E. don’t trust Preview or Safari. I refuse to upgrade FireFox to 3 for other reasons, like my paycheck.
2. This is pretty certain to be a problem with the way ColorSync approximates gamma correction at both the high and low end, and Photoshop uses a better method.
3. People use the expression gamma when they mean gamma correction and they also don’t realize that the gamma correction is only an approximation at the low end to prevent blocking up and at the high end because of saturation.
4. I’m always right.
5. SuperCal has a method of correcting the individual color gammas which is more difficult for blue. This may be due to the typical problems with blue such as low signal to noise ratio.
Let the games begin.
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