Blured text after rotation

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XnRoot
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Blured text after rotation

Post by XnRoot » Wed Feb 06, 2019 3:08 pm

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.

xnroot

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xnview
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Re: Blured text after rotation

Post by xnview » Wed Feb 06, 2019 3:14 pm

could you post original and output from XnView & Gimp?
Pierre.

XnRoot
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Re: Blured text after rotation

Post by XnRoot » Wed Feb 06, 2019 3:50 pm

The images? no problems with copyrights?

XnRoot
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Re: Blured text after rotation

Post by XnRoot » Wed Feb 06, 2019 3:59 pm

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 » Thu Feb 07, 2019 8:27 am

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 » Thu Feb 07, 2019 8:50 am

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 » Sat Feb 16, 2019 2:18 pm

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 » 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.

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XnTriq
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Re: Blured text after rotation

Post by XnTriq » Sat Feb 16, 2019 8:30 pm

XnRoot wrote:
Sat Feb 16, 2019 7:12 pm
what do you meen with 'smooth'?
BildDrehenDrehen…Anti-Aliasing

XnRoot
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Re: Blured text after rotation

Post by XnRoot » Sat Feb 16, 2019 9:33 pm

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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Re: Blured text after rotation

Post by XnTriq » Sun Feb 17, 2019 4:15 am

xnview wrote:
Sat Feb 16, 2019 2:18 pm
i 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.


XnRoot
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Re: Blured text after rotation

Post by XnRoot » Sun Feb 17, 2019 10:26 am

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 » Mon Feb 18, 2019 8:00 am

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.

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Re: Blured text after rotation

Post by XnRoot » Mon Feb 18, 2019 12:11 pm

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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xnview
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Re: Blured text after rotation

Post by xnview » Mon Feb 18, 2019 4:02 pm

no, you have only no or bilinear
Pierre.

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