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All images on this site come from contributions from collectors and dealers. If you have images you would like to contribute here are the general requirements that will help to make images more or less acceptable for display.
Yes, scanning IS confusing and it IS hard to get reliably good images. Learn much more about the process starting with Scanning Certificates.
Trick 1. Turn off automatic sharpening.
When scanners use automatic "sharpening", the software tries to increase the contrast along boundaries between light and dark areas and color differences. Unfortunately, fine lines in vignettes and borders confuse scanning software. The software cannot clearly define the "edges" of very fine lines. Certificates often become oversharpened, and consequently, become unusable. Overly sharpened vignettes end up looking "sparkly" and lack fine details.
Oversharpened. Notice the "sparkly" appearance, especially in the title.
Trick 2. Turn off automatic color adjustments.
In a similar manner, colored borders confuse the automatic color balancing of entry-level scanner software.
Trick 3. Turn off automatic exposure.
In my estimation, the worst thing is to let scanners set exposures automatically. Certificates usually end up looking too dark or too light.
Scanners set exposure by looking for a continuous gradation between black and white, or between colors and white. Certificates do NOT have gradational tones. They are either black, white, or have fine lines of solid color. Many scanners have a hard time setting good exposure with certificates. So why bother?
Trick 4. If scanning large large certificates in pieces, do
NOT change orientation.
Certificates are normally too large for ordinary, letter-size scanners. Nonetheless, you can use your scanner to get images.
The light bulb on most scanners is in front of the sensors that measure reflected light. Imagine that you scan your first piece with the top of the certificate facing the back of the scanner. The sensors would read color as if the light were coming from the bottom of your certificate.
If you flipped your certificate around to scan the remainder, then it would be like the light was hitting the top of the certificate. In other words, by flipping your certificate around, you make your sensors see a completely different quality of light. In doing so, you get different exposures and different colors.
Here is what happens when you change the orientation, and then patch the pieces back together.
This is an image from eBay. The bottom half of this bond was obviously scanned with a different orientation than the top.
Trick 5. Scan documents at full scale.
There are two reasons for this.
When you allow your scanner to make reductions, IT makes decisions about what information to discard. It reads information from several surrounding points, mathematically averages information, and creates new pixels that are not really there. The process is called "resampling."
Unfortunately, the software that comes with scanners thinks it is working with average kinds of documents. Certificates are not average documents. I have a special page that illustrates the problem of reducing certificates during scanning.
Trick 6. Scan against a WHITE background.
Certificates are not opaque. The color of the background ALWAYS shows through. Colored backgrounds are the worst, but black is almost as bad. Scan your certificates against a white surface.
I strongly recommend buying the Cox Catalog 3rd Edition from your favorite
If they do not carry, or are out of stock, you may buy directly from me. Simply click the buy button below.
Help support this free site! Please visit my eBay store called Papermental by Terry Cox. My inventory includes railroad passes, railroad ephemera, newspapers, magazines, engravings, and all sorts of paper collectibles.
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