XnView Software

BUG: Image transparency display is not consistent. Example: This logo's background is transparent...

http://s27.postimg.org/p7h058in7/logo.png

...but in XnView, the transparency is displayed only for thumbnail--not for preview or image view. Can this be fixed to be consistent so that transparency is either always displayed or not?

XnView 2.22

do you have 'use alpha channel'?

where do i find the setting 'use alpha channel' ?

ghost zero wrote:where do i find the setting 'use alpha channel' ?

There's a setting: Tools > Options > General > Operations -- Ignore alpha channel

So I guess that should be unchecked...

i do currently have that unchecked, which means alpha channels should show. so it's a bug that the alpha channel is not displaying in preview and image view?

3 ways:

Ctrl+h
right click on preview > use alpha channel (shortcut ctrl+h)
Menu: View > preview > use alpha channel (shortcut ctrl+h)

thibaud wrote:3 ways:

Ctrl+h
right click on preview > use alpha channel (shortcut ctrl+h)
Menu: View > preview > use alpha channel (shortcut ctrl+h)

do i have to set that separately for each?

- thumbnails
- preview
- image view

shouldn't there be just a single universal setting to keep this consistent throughout the program?

Recommended settings:

• Tools » Options...
  • General » Operations » Ignore alpha channel = Off (Thanks, cday!)
  • Read/Write » Read » PNG » Parameters » Compose image with transparency = Off
  • Read/Write » Read » PNG » Parameters » Compose image with alpha (32bits) = Off
  • View » View » Background colour = R128/G128/B128 (optional)
  • View » View » Use checkerboard pattern as background = On (optional)
  • Fullscreen » Background colour = R128/G128/B128 (optional)
• Browser mode: View » Preview
  • Use transparent index (<=8bits) or alpha channel = On
  • Use alpha channel = On
  • Show Mask = Off
• Viewer mode: View
  • Use transparent index (<=8bits) or alpha channel = On
  • Use alpha channel = On
  • Show Mask = Off

[color=green]xnview.ini[/color] (optional) wrote:

Code: Select all

[View]
CheckerColor1=8947848
CheckerColor2=8421504
CheckerSize=8

XnView Wiki (UI-less Settings » [url=http://www.xnview.com/wiki/index.php?title=UI-less_Settings#View]View[/url]) wrote:
CheckerColor1

• Changes the first color of the checkerboard pattern background.
  Value: Raw color (integer) or formatted color string

CheckerColor2

• Changes the second color of the checkerboard pattern background.
  Value: Raw color (integer) or formatted color string

CheckerSize

• Changes the size of squares in the checkerboard pattern background.
  Value: Integer, default value is 8

• PNG view/thumb/convert confliction
• PNG with transparency not showing
• PNG Transparency white background=Possible
• black color issue for PNG)
• PNG 32 BPP wrongly displayed…
• Transparency in PNGs is shown as white
• Issue with PNG/compose with alpha

thanks, i just needed to set these to get the transparency working in preview and image view...

Tools » Options...
◦Read/Write » Read » PNG » Parameters » Compose image with transparency = Off
◦Read/Write » Read » PNG » Parameters » Compose image with alpha (32bits) = Off

i didn't want the checkboard and i already have a custom background color.

NOTE: you mean "view > preview".

but it seems counter intuitive. i would expect the opposite behavior with these settings...

Tools » Options...
◦Read/Write » Read » PNG » Parameters » Compose image with transparency = Off
◦Read/Write » Read » PNG » Parameters » Compose image with alpha (32bits) = Off

...shouldn't composing an image with transparency/alpha make them used? why do we have to turn these off to make them used?

ghost zero wrote:NOTE: you mean "view > preview".

You're right, I forgot about browser mode. Thanks for the hint! I've edited my previous post accordingly.