XnView Software

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

could you post original and output from XnView & Gimp?

The images? no problems with copyrights?

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.

ok, could you send me the file by PM and i'll check

What file? The whole file not only the partly screenshot?

i think that you use 'smooth'?
In gimp, i have the same blured text after rotation.

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.

XnRoot wrote: ↑Sat Feb 16, 2019 7:12 pmwhat do you meen with 'smooth'?

Bild → Drehen → Drehen… → Anti-Aliasing

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.

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.

• Davies Media Design @ YouTube
  • GIMP 2.10 Tutorial: Scale Images with Minimal Quality Loss
• Andy Keech
  • Gimp vs Krita: How do different resizing algorithms compare?
• ImageMagick
  • v6 Examples: Nicolas Robidoux Resampling

yes, this works with image magick and also with gimp but not with xnview. as i said the optionanti-alias is activated.

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

Is there a way to change the interpolation method at the moment or do you want to add this as a new feature?

no, you have only no or bilinear