Blured text after rotation

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XnRoot
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Blured text after rotation

Post by XnRoot »

Hi,

i have a lot of scanned comics here and sometimes i have to rotate the page a little bit (offen only 0.1 or 0.2 degrees). after that very offen the text is a little but blurred. when i use gimp for that i have the same problem, but here i can change the interpolation method and get better results. i can't find any option like this in xnview. anti-alias is enabled, without anti-alias i can only rotate with higher steps (1.0 or 2.0 degrees). but doing this with gimp is annoying.

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xnview
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Re: Blured text after rotation

Post by xnview »

could you post original and output from XnView & Gimp?
Pierre.
XnRoot
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Re: Blured text after rotation

Post by XnRoot »

The images? no problems with copyrights?
XnRoot
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Re: Blured text after rotation

Post by XnRoot »

Here are the three examples. i only made screenshots of the first panel and the screenshot from gimp is bigger. the difference is not very high, i couldn't find a better example. first is gimp rotate 0.2 with lohalo interpolation. second is the original and third is xnview also rotated 0.2 degrees.
Last edited by XnRoot on Thu Apr 18, 2019 3:07 pm, edited 1 time in total.
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xnview
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Re: Blured text after rotation

Post by xnview »

ok, could you send me the file by PM and i'll check
Pierre.
XnRoot
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Re: Blured text after rotation

Post by XnRoot »

What file? The whole file not only the partly screenshot?
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xnview
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Re: Blured text after rotation

Post by xnview »

i think that you use 'smooth'?
In gimp, i have the same blured text after rotation.
Pierre.
XnRoot
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Re: Blured text after rotation

Post by XnRoot »

what do you meen with 'smooth'? interpolation method in gimp? in gimp i used 'lohalo'. in xnview there is no way to change the interpolation method.
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XnTriq
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Re: Blured text after rotation

Post by XnTriq »

XnRoot wrote: Sat Feb 16, 2019 7:12 pmwhat do you meen with 'smooth'?
BildDrehenDrehen…Anti-Aliasing
XnRoot
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Re: Blured text after rotation

Post by XnRoot »

This option is activated. without it i can't rotate an image in steps smaller than 1. steps like 0.1 or 0.5 are ignored.
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XnTriq
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Re: Blured text after rotation

Post by XnTriq »

xnview wrote: Sat Feb 16, 2019 2:18 pmi think that you use 'smooth'?
In gimp, i have the same blured text after rotation.
XnRoot is referring to an option for GIMP's Transform Tools which allows the user to specify interpolation methods called LoHalo and NoHalo.

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Re: Blured text after rotation

Post by XnRoot »

yes, this works with image magick and also with gimp but not with xnview. as i said the optionanti-alias is activated.
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xnview
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Re: Blured text after rotation

Post by xnview »

XnRoot wrote: Sat Feb 16, 2019 7:12 pm what do you meen with 'smooth'? interpolation method in gimp? in gimp i used 'lohalo'. in xnview there is no way to change the interpolation method.
Ok right, with lohalo, the result is better. i'll check
Pierre.
XnRoot
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Re: Blured text after rotation

Post by XnRoot »

Is there a way to change the interpolation method at the moment or do you want to add this as a new feature?
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Re: Blured text after rotation

Post by xnview »

no, you have only no or bilinear
Pierre.
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