Browser not showing transparent png files correctly

[jpage4500]

Hi,

I can't figure this one out for the life of me. I have XnView on 2 Macbook's.. 1 of them works fine but the other doesn't. The issue is that I have lots of white icons in .png format with transparent backgrounds.

I'm expecting to see some background color behind the images so I can identify them - but all I get is a white block. The images display correctly in the viewer tab - so it's just the thumbnail view that's not working.

I have 'use alpha channel' option checked but that doesn't seem to do anything. I've also rebuilt the thumbnails many times so it's not that either.. and since I have another Macbook (running the same/latest version) which works fine on the same set of icons - it MUST be a setting. I just can't see if after going back and forth between them.

Any ideas? I'd really appreciate it.

Hopefully the screenshots will show this problem best

grid view:


individual image (looks fine)
https://pasteboard.co/JpoX8Yg.png

settings:
https://pasteboard.co/JpoXpxG.png

[xnview]

could you post the thumbnail view on the mac where it works?

[jpage4500]

Sorry, I guess I didn't have notifications turned on because I didn't know someone replied to this message.

Here's a picture from XNView on another Macbook. Same images and same version of XNView. This is what I'm trying to achieve:

[jpage4500]

Not sure if it helps, but here's an example .png file.. nothing special - just a white icon with transparent background.

[xnview]

which compression do you use for thumbnails/catalog?

[jpage4500]

Both computers have this set to "Lossless (ZIP)" - although I've also tried disabling the catalog and no difference

[xnview]

settings>Thumbnail>Use alpha channel?

[jpage4500]

That would be the obvious choice - I agree.. but, checked/unchecked - no difference. Including rebuilding thumbnails after each check

[xnview]

That would be the obvious choice - I agree.. but, checked/unchecked - no difference. Including rebuilding thumbnails after each check

i can't reproduce, could you send me your xnview.ini?

[jpage4500]

>> could you send me your xnview.ini?

The last post gave me an idea.. I copied the /.config/xnview folder from the working mac to the one with the issue and that did it. I guess maybe this file was corrupted somehow..

anyway, looks like it's working now!

[eliio]

Hello,
I have the same problem and tried to check "Thumbnail > Use alpha channel" on and off, rebuild thumbnails, delete the folder from the catalog. Every time the thumbnails were generated opaque. I've attached the screen and the ini file.

[eliio]

Btw, for svg files I have transparency on thumbnails, regardless "Use alpha channel" is on or off.

[xnview]

could you send me a png example?

[eliio]

Yes, sure. The files are in the attachment.

[xnview]

Yes, sure. The files are in the attachment.

the PNG thumbnails use thumbnail list view background color, do you have tried to 'rebuild thumbnail'?