I had recently purchased a "Canon CanoScan LiDE 210" scanner in December 2013. I wanted to archive all the CD covers of my collection. I did not realize that scanning CD covers will be one of the most tiresome, and complex chores I had ever gotten myself into. The following terms will come back to haunt me:
descreen
moire patterns
gaussian blur
despeckle
moire patterns
gaussian blur
despeckle
fourier transform
unsharp mask
The first time I scanned the CD cover of the 1996 TIPS release of "Hindustani" - the scan was horrible filled with fine dots viewed at resolution of 1200 dpi. Only later after going the Internet, I realized the "moire patterns" that will appear when we scan CD covers due to they way they are printed (i.e. half-tone prints). It was frustrating experimenting with the various methods available online to minimize the "moire patterns" from the scans of the CD covers. I actually downloaded the trial version of "Adobe Photoshop Elements 12" to try out the recommended methods.
As a rule of thumb, scan CD covers at a resolution of 300 dpi with the "descreen", and "unsharp mask" settings on the scanner enabled to reduce the effects of the "moire patterns", and save the image in "TIFF" format.
The cover of "Hindustandi" CD above was scanned at a resolution of 150 dpi for image display on the web with the "descreen" setting on the scanner enabled, and saved in "JPEG" format. It's not perfect but I will accept the scan quality for the moment.
The cover of "Hindustandi" CD above was scanned at a resolution of 150 dpi for image display on the web with the "descreen" setting on the scanner enabled, and saved in "JPEG" format. It's not perfect but I will accept the scan quality for the moment.
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