DeSkew or Straighten

Ideas for improvements and requests for new features in XnView Classic

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JamesGT
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DeSkew or Straighten

Post by JamesGT » Tue Sep 13, 2005 8:01 pm

I'd like to see a function where XnView will take an image and straighten it.

If you scan a page, or recieve a fax via email, sometimes the page is slightly skewed by 1 or 2 degrees, or less than a degree.

I've seen one program that does an excellent job at it, however it costs a fortune. I can do it in Photoshop but it's very time consuming. It would be nice to see XnView incorporate this into it's next version

Thanks!

JamesGT

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helmut
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Post by helmut » Tue Sep 13, 2005 8:05 pm

Thanks James, for the suggestion and welcome in the forum.

I'm a bit unclear how this DeScew or straighten should work:
Is it a simple manual rotate or should XnView actually try to interprete the image and automatically DeScew it?

JamesGT
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Post by JamesGT » Tue Sep 13, 2005 8:15 pm

XnView should try to interpret the image and then automatically straighten/deskew it. IE : Press CTRL-D and it straightens the image.

XnView already has rotate, but it doesn't give enough adjustment. It only has 1 degree increments. Sometimes I need to adjust by a half or a quarter of a degree.

I could even go for a manual rotate with adjustments to 0.01 of a degree if I had some kind of horizontal reference to be able to match it up.

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helmut
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Post by helmut » Tue Sep 13, 2005 8:39 pm

Thank you, James, for the extra info, I understand, now.

In some situations, manual rotating with less than 1 degree is really needed.

And an automatic de-skew would be helpful, even if I don't know how much effort programming this is. As you probably know, XnView supports Adobe Plugins, perhaps there is a filter somewhere available which can do this?

There's a related topic (but not similar) please see "Rotation based on the horizon line +auto-crop option".

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JohnFredC
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Post by JohnFredC » Mon Oct 03, 2005 5:16 pm

I agree with this request, but XNView will need to improve its rotation algorithm first. Rotate an image by a few degrees in XNView, then perform the same rotation in Photoshop or Paintshop Pro. Zoom into both images and compare them.

You'll see what I mean. XNView rotation creates block artifacts that look like jpeg compression blocks.

I always rotate outside of XNView.
John

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xnview
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Post by xnview » Mon Oct 03, 2005 6:16 pm

JohnFredC wrote:I agree with this request, but XNView will need to improve its rotation algorithm first. Rotate an image by a few degrees in XNView, then perform the same rotation in Photoshop or Paintshop Pro. Zoom into both images and compare them.

You'll see what I mean. XNView rotation creates block artifacts that look like jpeg compression blocks.

I always rotate outside of XNView.
Yes i'll improve rotation
Pierre.

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