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Post by Ted Talks Stamps on Nov 24, 2023 20:46:09 GMT
Instead of cluttering up the Bergedorf thread with scanner chatter, I thought I'd move the convo here.
I've gone down the rabbit hole, and I'm checking out all of the various settings and controls available in Vue-Scan, and making a lot of comparison scans. First thing that I noticed was that no matter what bit-depth I select 24-bit RGB, 48-bit RGB, or 64-bit RGB, the file sizes of my test scans are identical - 17.1 MB.
I though higher bit depths are supposed to create larger files. What am I missing?
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Post by Ted Talks Stamps on Nov 24, 2023 21:35:43 GMT
This is a test scan I made to see how other colors fare besides yellow. The Azores is still too ochre, the 1kr brown should be biased toward yellow-brown. So, there again, yellow is lacking. All the rest look pretty darned close, close enough for government work, as we QA-types at General Dynamics used to say , to my live samples (on MY monitor, of course; your mileage may vary). This brings up the question, again, which I asked in the other thread. Why does the yellow Bergedorf stamp scan so faithfully to the actual stamp color?
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Post by Ted Talks Stamps on Nov 24, 2023 22:35:57 GMT
I've given up on trying to adjust the scanner to provide accurate yellow. If I get a good yellow color on the stamp, the black background also ends up with a yellow cast. I'll just have to adjust yellow stamp scans on an individual basis in PaintShop Pro. I get a pretty decent result with the Hue/Saturation/Lightness control, and my black background stays black.
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angore
Junior Member
Posts: 75
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Post by angore on Nov 25, 2023 11:52:49 GMT
I had trouble with colors for a long time, then after my cataract surgery, I discovered the condition enduced a yellow cast on my sight. Whites now are very white and colors are purer.
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Post by Ted Talks Stamps on Nov 25, 2023 12:42:19 GMT
I had surgery back in June, so I can't blame this on cataracts.
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Post by ClassicPhilatelist on Nov 28, 2023 4:11:08 GMT
Ted, Have you tried looking at the unmodified image on other monitors and on a mobile phone? You may be adjusting to fit one monitor, while everyone else sees a good image... Digital color is a virtual impossibility to have uniform.
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Post by Ted Talks Stamps on Nov 28, 2023 21:34:26 GMT
I don't have any other monitors on which to compare images, only my mobile phone screen. And, while I may be adjusting to fit one monitor, everyone else may see a bad image. Who can tell?
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Post by khj on Nov 28, 2023 23:15:38 GMT
Which is why I never post a picture of my face online.
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Post by ClassicPhilatelist on Nov 30, 2023 13:33:06 GMT
While I have made this point to the extreme, generally speaking most things do show up reasonably close to as they appear. When I do notice something significant, it's usually because someone has altered the image color/hue/saturation/brightness/contrast to more accurately "represent" the stamp. It's a tricky thing, and not a perfect science. We have taken the position of painstakingly establishing an environment with our image capture, and then we take the image. There's not alteration aside from cropping and rotation for level if that is an issue in an image. It also reduces the amount of time it takes to take and post images (this is in particular related to sales, it's "less important" in a discussion threat.
But if someone asks me what shade a particular early classic US stamp like 10/11, 70, 78 the answer always has to be, "I have to have it in hand to make that determination". It's just not possible to determine from any digital imagery. (At least not without sinking huge sums into scientific instrumentation, which even then I'm not sure exists, and by that I mean for digital creation and display).
Find an environment that is 90%, and then stick with it.
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angore
Junior Member
Posts: 75
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Post by angore on Dec 1, 2023 12:21:34 GMT
In the absence of stamps in hand, I believe the next best way is is scan the stamps with known reference samples in the same scan so a comparison can be made. What ever the color shift in scanning, it would be common if all scanned at the same time. I do not like shades in part because inks are fugitive and scanners change (bulb age, calibration, etc) so a moving target.
Has anyone tried to calibrate a scanner using the T8? targets. VueScan has a color calibrate utility for these targets. Do not run it without the target!!
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