XnView Software

On 1.80 and earlier - "Change Color Depth 32bits Alpha 255" used to add pure white Alpha Channel.
On 1.82+ it does nothing.

If your image has alpha, and you simply convert it to 24bits it will look cutout.
In the past, it was possible to workaround it, by simply getting rid of Alpha Channel:

Converting it into full white 255, and then flattening it with 24 bits. Receiving a nice full image.

Now it's broken.

-
On 1.80:
Change Color Depth: 32 bits Alpha 255
Resize: 3k
ICC Convert
Canvas Resize: 3k x 3k , Alpha 255, Keep Ratio
Change Color Depth: 24 bits

Produces:


On 1.85:
Same settings produce:

Change Color Depth is broken in 1.85.1.

But for my intended use, I managed to delete Alpha Channel by:

1. Create a full white image in any image editor and save it as GIF in XnConvert Mask directory:
On Mac: /Users/XXXXX/Desktop/XnConvert.app/Contents/Resources/AddOn/Masks/white.gif
2. In XnConvert Add action: "Add mask"
3. Navigate to the image you have created in the previous step:
e.g.: /Users/XXXXX/Desktop/XnConvert.app/Contents/Resources/AddOn/Masks/white.gif
2. Check "Use mask as Alpha"
4. Add "Change color depth"
5. Select "24 bits"

How do I invert the alpha channel of an image?

could you send me the original file?

xnview wrote: Mon Jul 20, 2020 1:20 pm could you send me the original file?

https://we.tl/t-ZrxYx0NkW0

I've included 3 files:

• 1x Original

• 1x generated with XnConvert 1.80:
  Change Color Depth: 32 bits Alpha 255
  Resize: 3k
  ICC Convert
  Canvas Resize: 3k x 3k , Alpha 255, Keep Ratio
  Change Color Depth: 24 bits
  

• 1x generated with the same settings on XnConvert 1.85.1
  Change Color Depth: 32 bits Alpha 255
  Resize: 3k
  ICC Convert
  Canvas Resize: 3k x 3k , Alpha 255, Keep Ratio
  Change Color Depth: 24 bits
  

crazydaz wrote: Tue Jul 28, 2020 1:20 pm

xnview wrote: Mon Jul 20, 2020 1:20 pm could you send me the original file?

https://we.tl/t-ZrxYx0NkW0

Sorry but the link has expired, could you post it again?

Sorry for the delay.

https://we.tl/t-qaWu9DsCMY

All exported with the same settings:
Change Color Depth: 32 bits Alpha 255
Resize: 3k
ICC Convert
Canvas Resize: 3k x 3k , Alpha 255, Keep Ratio
Change Color Depth: 24 bits

Thanks to your detailed description I can reproduce the problem.

This problem is supposed to be fixed in XnView MP 0.98.0. Please check and confirm the bug fix here.

xnview wrote: Mon Dec 14, 2020 2:45 pm This problem is supposed to be fixed in XnView MP 0.98.0. Please check and confirm the bug fix here.

Sorry for the late reply.

Can confirm it is fixed in XnConvert 1.90! Many thanks!