BUG: Image transparency display is not consistent...

[ghost zero]

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

[xnview]

do you have 'use alpha channel'?

[ghost zero]

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

[cday]

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...

[ghost zero]

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?

[thibaud]

3 ways:

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

[ghost zero]

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?

[XnTriq]

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

Code: Select all

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

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

[ghost zero]

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".

[ghost zero]

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?

[XnTriq]

NOTE: you mean "view > preview".

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