How to remove the defects of window picture Scanner
Hello
My first post over the years.
I recently bought a large dumpster scanner to scan - Mustek A3 USB 2400 PRO - newest technology.
It's probably a problem of with all scanners that use a (bar) LED light source rather than the old technology "fluorescent tube.
I noticed a regular pattern about an inch bars wide, up and down each scan. This appears ONLY if I do a severe contast stretch to almost white. The problem was that the model easily appears on 'dark backgrounds of an image', even after some minor stretching. If I lift the cover with something like a small object 1/4 "thick (for example an eraser) and do a scan of effectively the" space vacuum air "above the flat window, the same model is displayed in the 'empty space' far from the document - so that the stripes are NOT in the document, they are on the glass of the window - or a natural flaw in the way LED bars are made. I cleaned the window of the scanner with glasses drinking, Windex, cleanser and rubbed hard to Polish, in the case where new glass was "scraped" by the vibrations of the cover when shipped to me. I also tried scanning documents to several resolutions, low maximum of 2400 dpi for this model. Nothing helps.
I seems likely these, about one inch wide parallel strips, are actually the LED bar, perhaps composed of eleven segments of lighting an inch wide LED (on this great scanner model). This is similar to the way in which computer screens portable LCD would show scratches on black screens. Each LED segment may be just very slightly different in intensity, and there is a "bright streak" to some of these "bar of the edges of the segment. Which would be caused by the light segments LED "not joined is not well enough to produce a luminous tube spaced regularly. The LED light bar "discreet, segemented" is not the same quality of light, as a source of continuous fluorescent light to the old.
To prove it, I did a scanned image 'air' of full bed (cover of the scanner deleted entirely, in a dark room) as a so-called 'Flat framework'. Then, I scanned a "dark color document (the"black cover inside"surface will do as test)."
Then, I used Photoshop CS5 "Calculations" in the "DIFFERENCE" mode. It subtracts the flat frame (with just the vertical streaks and bands of an inch), in the test document. Of course, "noise from the window" has been pretty well removed from analysis. AFAIK, there is no other method in Photoshop CS5 to fix the flaw of LED technology for the scans of photos of all sizes. Cannot use "Pattern" filters since it is not a regular pattern as those of offset presses, or any other printed matter.
Everyone knows about this problem with a scanner flat LED? This does not happen with my Epson Perfection 4880 (fluorescent light)
I can ONLY use the method of DIFFERENTIATION on a flat frame, if I perform analyses flat full even for small items, since there is no way to differentiate a flat frame 'section', which would be the same size and position as a smaller document (print, etc.).
A REAL DIFFICULTY would be if TWAIN drivers had a command to run a flat frame and save it in the memory to be broken by simply applying the coordinates of all the new scans of paper. It's like the scanner with a 'default map' for the entire window, and it can then simply use the section that is the same size as the new document, until the user recalibrates the flat frame.
It is not likely to happen, then maybe a really good feature for Photoshop CS5 update would be to integrate this in the software, under the "IMPORT" of the scanner, or at least to have such an option under "calculations".
Hope that technicians Adobe read this lengthy post. -All comments and suggestions would be welcome.
Thank you
Joe
Many drivers scanner do a calibration on the flat ground (which has to do with the response from white, and they have a bunch of built-in white calibration) and a black level calibration (for the reflection of noise and glass) as they scan.
You should probably use subtract blend instead of the difference mode, and you can just use layers instead of the old calculations command (which was how you did these things before the layers).
Tags: Photoshop
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