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Old 09-28-2008, 04:38 AM   #1
scanner
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scanner problem

hello

I scan at1 TIF 600dpi at greyscale in my scanner OpticBook 3600

as you can see in this screenshot, the scanner somehow produces images with some marks, I don't know if glossy paper is responsible for this (the marks look like reflections) or the scanner or something else

this is the crop of a scanned page:


this is the same crop but with lowered brightness and contrast in photoshop:


the characters have marks around them and these can cause problems to the Finereader 9 and spot them as 'uncertain characters'

do you know what causes this?
I also wonder if there is a way to fix this

thanks
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Old 09-28-2008, 08:02 AM   #2
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Load the tiff into Photoshop and try to clean it up.
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Old 09-29-2008, 05:23 AM   #3
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Load the tiff into Photoshop and try to clean it up.
How can you do it?
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Old 09-29-2008, 06:28 AM   #4
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You can convert it to a two-level (black and white, no grey) image, or touch the "levels" so that everything above some threshold is pure white and everything below some other threshold is pure black.
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Old 09-29-2008, 07:21 AM   #5
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You can convert it to a two-level (black and white, no grey) image, or touch the "levels" so that everything above some threshold is pure white and everything below some other threshold is pure black.
I see. My PS knowledge is very scant.
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Old 09-29-2008, 08:03 AM   #6
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This is just the scanner showing you what's there -- the paper around the letters probably is a little darker. Adjust the scanner settings to increase the contrast. Come to that, if you're scanning at 600dpi, you can probably get better results scanning in black and white, not greyscale (except for images, of course). 1-bit sample attached.

Paul

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hello

I scan at1 TIF 600dpi at greyscale in my scanner OpticBook 3600

as you can see in this screenshot, the scanner somehow produces images with some marks, I don't know if glossy paper is responsible for this (the marks look like reflections) or the scanner or something else
Attached Thumbnails
Click image for larger version

Name:	1-bit.png
Views:	167
Size:	2.0 KB
ID:	16644  

Last edited by pdurrant; 09-29-2008 at 08:07 AM.
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Old 09-29-2008, 08:37 AM   #7
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One thing you can try is to go to the filters and then noise and try despeckle or dust & scratches.
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