Bitmap (.bmp) Thumbnails

[LeoGrun]

Maybe I am doing something weird or have not configured something correctly, however Multi Commander does not preview thumbnails for .bmp files.

If thumbnail data is already generated by windows, Multi Commander will use it.

Instead, I see the icon for my default image viewer in windows (Ifranview, in this case).

Is there a way to make Multi Commander show/generate thumbnails for bitmap images?

[Mathias (Author)]

You mean normal thumbnails when viewing the filelist in thumblist mode ? Not the hover over preview thumbnail ?

Thumbnail for filelist are created by Windows, MC just ask Windows for it. and Windows should create it if not already cached.
There should be no issue showing bmp,

Check this configuration
In Core Settings > FileSystem , under Tweaking.
Makesure Thumbnail system is set to Auto or Windows.

Also if "Log thumbnail process" is enable you should be able to see error from MC get from windows when fetching thumbnails in the log.. (Ctrl+L)

[LeoGrun]

It was originally set to 'auto'. I changed it to 'windows' just to test. It did not make a difference. I wasn't able to see anything useful in the log.

I changed the number of threads from 'auto' to '2' and it is now working as expected. I can't say conclusively why this made a difference, but I'm available for questions about my system and configuration of you would like.

[Mathias (Author)]

It was originally set to 'auto'. I changed it to 'windows' just to test. It did not make a difference. I wasn't able to see anything useful in the log.

I changed the number of threads from 'auto' to '2' and it is now working as expected. I can't say conclusively why this made a difference, but I'm available for questions about my system and configuration of you would like.

Strange., Should not matter. But maybe there is something on your Windows Setup that does not like multiple call for getting thumbnail at the same time.
Also if you got some graphic tools (not sure whitch..) they replace Windows Thumbnail engine with their own (Most to add support for more image formats),  it can also be that if you have something like that installed. They do not like multiple calls.
Default in windows should have not issue with it. I run 16 threads, so it can get 16 thumbnails at once.

[LeoGrun]

I have experimented a little bit. It seems as long as I pick a number at all it seems to work.

The actual number seems irrelevant, as long as it is not set to 'auto' the machine appears to cope and act as you would expect with increasing and decreasing the number resulting in faster or slower results, even if I try to go well above the number of threads my machine should logically support.

I do believe that Ifranview, rather than windows, is creating the thumbnails on my setup. This workaround is simple enough to suffice and addresses the issue. I have set it to 4 threads which is below the number of threads my machine can handle, but it is still quite fast for generating the thumbnails, or perhaps the slow part of my setup is between the keyboard and chair . Or perhaps, Windows is simply so slow and terrible now-- which is I why I am back to Multi Commander!-- that anything appears to be an improvement.

At any rate if there is anything you would like from me, please do ask. I do want to thank you for making the software I run screaming and crying to every time Microsoft does something stupid to explorer.