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I also have a serious interest in studying the colors of the 3 cent issue of 1851 -- 1857 -- and would like to learn more about your technique for utilizing your scanner to compare un-colorized stamps against those where the colors have been confirmed. Is that something you would be willing to share?
I am also curious which model Epson scanner you are using -- as I have been considering purchasing an Epson Perfection V600 Photo Scanner to replace my 11 year old Epson Artisan 710. Any comments you have in this regard are appreciated.
Hi, ioagoa. I use an Epson V370 scanner. The only recommendation I can make regarding buying a scanner for stamps is to buy Epson. My understanding is that they have a limited number of models for sale at any given time, but I don't know which of their models are better than others.
Since the 3-cent imperforate colors have so many subtle variations, I have been using Epson Scan's professional mode, and changing the RGB values in the Histogram Adjustment tool until the preview image on the screen looks closest to the colors that I see with direct viewing. This is mainly for my own use, although I do post some of these scans for others to view on their monitors.
Moyock13, I have tried VueScan with my Epson scanner, and was disappointed with the functionality and scan results. I could never get the clarity that I get with Epson Scan, even though I used both apps with the same scanner.
Here is an example scan of clarets and yellowish rose reds (and claret/YRR candidates) that I made to help me evaluate my colors:
Stamps 1, 2, and 3 were known clarets in the pale-to-medium range
Stamp 4 was unknown, and determined to be in the medium claret range
Stamp 6 was a known medium claret
Stamp 7 was a known deeper claret
Stamps 8 was a known YRR in the pale-and-yellowish range
Stamps 9 was a known YRR in the medium-and-deeper range
Stamp 10 was annotated "1856 yellowish rose red" on the back by Fritz, an experienced 3-cent plater and color specialist
Stamp 5 is very similar to stamp 10, but is unresolved, and I want to scan it with other colors
As most here know, current convention is to group the yellowish rose reds into a pale-and-yellowish range and a medium-and-deeper range. Stamp 10 would then be at the deeper end of the YRR medium and deeper range, explaining why it looks so much different than stamps 8 and 9.

Disclaimer: This image is provided to display variations in ink color between different stamps, all of which were scanned together. Because of variations in scanner settings, and because different display screens render colors differently, this image may not be suitable for confirming colors of stamps in hand or in other images.