scanner problem

scanner · 09-28-2008, 05:38 AM

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

JSWolf · 09-28-2008, 09:02 AM

Load the tiff into Photoshop and try to clean it up.

astra · 09-29-2008, 06:23 AM

Quote:

Originally Posted by JSWolf

Load the tiff into Photoshop and try to clean it up.

How can you do it?

Jellby · 09-29-2008, 07:28 AM

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.

astra · 09-29-2008, 08:21 AM

Quote:

Originally Posted by Jellby

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.

pdurrant · 09-29-2008, 09:03 AM

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

Quote:

Originally Posted by scanner

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

JSWolf · 09-29-2008, 09:37 AM

One thing you can try is to go to the filters and then noise and try despeckle or dust & scratches.

09-28-2008, 05:38 AM	#1
scanner Member Posts: 13 Karma: 10 Join Date: Jul 2008 Device: sony	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

09-28-2008, 09:02 AM	#2
JSWolf Mobile Reader Geek Posts: 16,138 Karma: 18503 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Sony Reader PRS-505	Load the tiff into Photoshop and try to clean it up. __________________ Jon If you want to listen to really good music while you surf Mobileread, here.

09-29-2008, 09:37 AM	#7
JSWolf Mobile Reader Geek Posts: 16,138 Karma: 18503 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Sony Reader PRS-505	One thing you can try is to go to the filters and then noise and try despeckle or dust & scratches. __________________ Jon If you want to listen to really good music while you surf Mobileread, here.

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09-29-2008, 07:28 AM	#4
Jellby frumious Bandersnatch Posts: 1,890 Karma: 8609 Join Date: Jan 2008 Device: Cybook Gen3	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.