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scanner is scanning off center though the image is perfectly straight, Epson 3170

Posted on 2010-08-12
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Last Modified: 2013-12-27
I was scanning a baseball card. I put a clear piece of plastic on the surface of the scanner to keep from getting it scratched. I centered the card right in the middle of the top of the scanner which is 9 inches.

The resulting scan was tilted.

If the middle and top of the card was "12 on a clock" the scanned photo looks like the middle of the top of the card is now at 11 on the clock, as if it got moved before it was scanned. But, after scanning I opened the lid and the card was dead center like I left it.

What is causing the scanner to see this card at the wrong angle?

I have not made any adjustments to the scanner. I have used it "as is" since getting it:
for documents, coins and baseball cards and it has been working fine.
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Question by:nickg5
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Fixforyou earned 200 total points
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When a scanner scans it is dependent on the mirrors being perfectly parallel, it is possible that a bump to the device or over a period of time the mirrors got out of adjustment and caused the image to skew.  
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by:nickg5
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what ways are there to fix that?
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by:Fixforyou
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I don't want to steer you into the wrong direction, since some scanners use an "auto skew" adjustment.  And this may not even be your problem, but as a copier/scanner technician I would start with the mirrors and making sure they are perfectly parallel after of coarse using a test pattern that would verify the skew is not software related.  Your printer may have a "transportation" lock on the back of the unit, which usually does not get used when you are actually moving the device.

Did you recently move the device where it may have got handled a little rough, or could it be a software "auto-skew" issue.  What does it do on a normal page that is scanned?  

If you think the mirrors are out of wack, there are usually alignment marks on the rails for the mirrors.  I tried to find any documentation on the internet but could find nothing.
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by:nickg5
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the scanner has not been moved since first put into use. It is on my desk and stable.
Some items I scan are 3 dimensional and not flat like a document.
However, I scanned a plastic storage case of coins and it was about 1/4 inch thick. The back end of the scanner lid raises up to allow for thick items.
This scan of the coin holder was perfect.

Later I scanned a baseball card in a protector plastic holder that was at most 1/16 of an inch thick.  This image was cocked to the left, pointing northwest.

I just scanned a document with text, and it is straight as an arrow.
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by:nickg5
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my error, looking for help with my last comment, not my last two.
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by:Davis McCarn
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Your original post states that the scan was not centered; but, still straight, and that will be a function of the page margins set in the software you are scanning the image into (i.e. a "centered image" will be shifted as the program added a .75" margin)
Your newer post seems to indicate the image is skewed (i.e. rotated xxdegrees)
Which is it?
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by:aburr
aburr earned 75 total points
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IF it is ONLY the baseball card that is skewed and if that is the only time you used the plastic protector, it is possible that static electricity is moving the card when the lid is closed and returning it to the original postion when the lid is opened.. This can be checked.
Try scanning without the plastic. You can be extra careful not to scratch for the test scan.
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by:giltjr
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Scanners work using bright light, just like a copier.  It is also possible that the plastic is bending the light cause the skew.

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by:JohnBPrice
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>>I just scanned a document with text, and it is straight as an arrow.

I'm thinkin FixForYou is right in that it is an "auto skew correction" failure.  Try this:

A) Place a text document over the base ball card to give the auto skew correction something better to work with.  You can crop out the card afterword.

B) Find and turn off auto skew correction
 
 
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by:nickg5
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I moved, and no longer have the scanned image that was off so many degrees.

It was cocked to the left maybe to the 11pm hour (as if it were a clock), when I was expecting it to be straight up at 12 on the clock.

I'll try to scan another baseball card, another coin, and a baseball card that has a white 8.5 x 11 piece of paper as a background.

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by:JohnBPrice
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>>white 8.5 x 11
Maybe white will work, but it might work better if there is typical text that the auto-skew can examine.
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by:nickg5
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ok, I'll try that.
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by:nickg5
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here is a baseball card scanned and the card is in a plastic storage case about 1/4 inch thick.
http://i528.photobucket.com/albums/dd328/naeem5/File0022-sm.jpg

here is a baseball card scanned with a white background.
 http://i528.photobucket.com/albums/dd328/naeem5/File0023sm.jpg

you can see the difference.

Is this mirrors?
or?

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by:aburr
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you notice that they are BOTH tilted.
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by:nickg5
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the single card that was not in a plastic storage case, may have been off center when placed in the scanner, or moved slightly by opening and closing the scanner lid.

the card in a heavy plastic case is far more off center, and it could not have been moved by opening and closing the lid.

So, it seems the card on the white background, scanned properly, and the other one did not.
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by:nickg5
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not trying to close the question, trying to award points.

system error?
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Author Closing Comment

by:nickg5
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no clear solution or the cause, not sure about adjusting mirrors, using a background for baseball cards is a help.
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by:nickg5
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meant to award 500 points but the system did not alert me that only 425 had be awarded.
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