XnView Software

Posted: **Sat Nov 08, 2025 6:27 pm**

Hello,

on Ubuntu 24.04 (x64), i7-1260P, 32 GiB RAM, image comparison stopped working maybe a half year ago. (It had been working fine before that.)

Now in 1.9.5 it partially works again for small images but after closing the program, XnView process keeps running, 100% utilizing one CPU core and must be killed manually. (It's actually two processes.)

Comparing larger images (e.g. 24 megapixel) doesn't work at all. Nothing is displayed and the process must be killed.

Please look into it if you can. It's a very useful feature. Thank you.

Code: Select all

2025-11-08T19:34:39.382869+01:00 emcmp XnView.desktop[8747]: ### CRASH ###
2025-11-08T19:34:39.388504+01:00 emcmp XnView.desktop[8747]: message repeated 3509 times: [ ### CRASH ###]
2025-11-08T19:34:39.388508+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467700: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388510+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467701: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388512+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467702: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388514+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467703: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388515+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467704: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388517+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467705: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388519+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467706: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388521+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467707: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388522+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467708: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388524+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467709: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388526+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467710: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388528+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.32 ] error    3 BadWindow    request   20 minor    0 serial 467711: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388529+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.33 ] error    3 BadWindow    request   20 minor    0 serial 467713: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388531+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1269.33 ] error    3 BadWindow    request   20 minor    0 serial 467714: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388533+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1530.70 ] error    3 BadWindow    request   20 minor    0 serial 494642: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388535+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1530.70 ] error    3 BadWindow    request   20 minor    0 serial 494643: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388537+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1597.89 ] error    3 BadWindow    request    2 minor    0 serial 525026: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.388550+01:00 emcmp XnView.desktop[8747]: ### CRASH ###
2025-11-08T19:34:39.395161+01:00 emcmp XnView.desktop[8747]: message repeated 3509 times: [ ### CRASH ###]
2025-11-08T19:34:39.395166+01:00 emcmp /usr/libexec/gdm-x-session[2105]: [  1616.14 ] error    3 BadWindow    request   20 minor    0 serial 548924: "BadWindow (invalid Window parameter)"
2025-11-08T19:34:39.395181+01:00 emcmp XnView.desktop[8747]: ### CRASH ###
2025-11-08T19:34:51.203612+01:00 emcmp XnView.desktop[8747]: message repeated 5598896 times: [ ### CRASH ###]
2025-11-08T19:34:51.203687+01:00 emcmp systemd[1]: systemd-hostnamed.service: Deactivated successfully.
2025-11-08T19:34:51.203811+01:00 emcmp XnView.desktop[8747]: ### CRASH ###

Posted: **Wed Nov 19, 2025 6:45 am**

you means comparing 2+ images side by side?

Posted: **Fri Nov 28, 2025 5:15 pm**

Yes.
But I've solved the problem by deleting

Code: Select all

~/.config/xnviewmp/

directory.
Probably there was something wrong in the configuration impairing only this side by side comparison.

Posted: **Fri Nov 28, 2025 5:43 pm**

But please wait with closing this ticket.
I've changed only a couple of things and the problem is back. I'll try to find the settings that causes the problem.

Posted: **Fri Nov 28, 2025 6:02 pm**

Found it. It's this setting causing the problem:

: xnviewbug.png (125.45 KiB) Viewed 62 times

When set to None or Bilinear (default), everything is fine.

With other options (like Bicubic, Lanczos etc.) only small images display in comparison view and XnView process must be killed afterwards. Larger images don't display at all.

I think (but I'm not 100% sure) that the side by side comparison used to work even with Lanczos3 (my preference) in older versions.

Posted: **Fri Nov 28, 2025 8:21 pm**

can confirm an issue (win11)
1. set zoom-in to Bicubic, Spline32 or Lanczos3/4
2. select 2 images (original + its copy) in Browser and press SHIFT+C
3. select A/B and zoom-in to >200%
image(s) will be black

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