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Author Topic: Scanner problem (lines/artifact/something)  (Read 1010 times)

wolfmah

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Scanner problem (lines/artifact/something)
« on: February 15, 2013, 09:14:04 PM »

Hi there,

I wanted to start scanning my old albums of pictures I have from before the digital age and stumble upon a problem that appears in all my scan, and multiple times per scan at regular interval (see attachement).

I get this kind of misalignement of pixels which, depending on the texture, can be quite jarring. Those "lines", once you have spot one, you can see it running on all the vertical axis of the scan. Also, those are found at regular interval 1300 pixels or so (at 1200 dpi).

I was wondering if anyone ever got those scanning artifact and if so, how can it be remedied. Is it just because I have a sub-par scanner?

Here's what I use to scan:
Mac OSX 10.7.5
Epson Artisan 835

Color @1200 dpi (I know it's a black and white picture, I was testing file size. And yes the same thing happen in B&W mode)
TIFF format
No correction whatsoever (though I tested with some Dust removal, Descreening and Unsharp Mask, but it's still there).

The file attach is a section of a 100% view of the picture.
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Alan Klein

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Re: Scanner problem (lines/artifact/something)
« Reply #1 on: February 16, 2013, 08:59:11 AM »

Can you post the whole photo?
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BartvanderWolf

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Re: Scanner problem (lines/artifact/something)
« Reply #2 on: February 16, 2013, 09:12:05 AM »

I wanted to start scanning my old albums of pictures I have from before the digital age and stumble upon a problem that appears in all my scan, and multiple times per scan at regular interval (see attachement).

I get this kind of misalignement of pixels which, depending on the texture, can be quite jarring. Those "lines", once you have spot one, you can see it running on all the vertical axis of the scan. Also, those are found at regular interval 1300 pixels or so (at 1200 dpi).

Hi,

That hints at a resampling issue (downsampling).

Cheers,
Bart
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