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Blured text after rotation

Posted: Wed Feb 06, 2019 3:08 pm
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.

xnroot

Re: Blured text after rotation

Posted: Wed Feb 06, 2019 3:14 pm
by xnview
could you post original and output from XnView & Gimp?

Re: Blured text after rotation

Posted: Wed Feb 06, 2019 3:50 pm
by XnRoot
The images? no problems with copyrights?

Re: Blured text after rotation

Posted: Wed Feb 06, 2019 3:59 pm
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.

Re: Blured text after rotation

Posted: Thu Feb 07, 2019 8:27 am
by xnview
ok, could you send me the file by PM and i'll check

Re: Blured text after rotation

Posted: Thu Feb 07, 2019 8:50 am
by XnRoot
What file? The whole file not only the partly screenshot?

Re: Blured text after rotation

Posted: Sat Feb 16, 2019 2:18 pm
by xnview
i think that you use 'smooth'?
In gimp, i have the same blured text after rotation.

Re: Blured text after rotation

Posted: Sat Feb 16, 2019 7:12 pm
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.

Re: Blured text after rotation

Posted: Sat Feb 16, 2019 8:30 pm
by XnTriq
XnRoot wrote:
Sat Feb 16, 2019 7:12 pm
what do you meen with 'smooth'?
BildDrehenDrehen…Anti-Aliasing

Re: Blured text after rotation

Posted: Sat Feb 16, 2019 9:33 pm
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.

Re: Blured text after rotation

Posted: Sun Feb 17, 2019 4:15 am
by XnTriq
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.


Re: Blured text after rotation

Posted: Sun Feb 17, 2019 10:26 am
by XnRoot
yes, this works with image magick and also with gimp but not with xnview. as i said the optionanti-alias is activated.

Re: Blured text after rotation

Posted: Mon Feb 18, 2019 8:00 am
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

Re: Blured text after rotation

Posted: Mon Feb 18, 2019 12:11 pm
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?

Re: Blured text after rotation

Posted: Mon Feb 18, 2019 4:02 pm
by xnview
no, you have only no or bilinear