1.0: Checking or unchecking "Use alpha channel" "Show alpha" has no effect when using "High zoom quality"

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lffs
Posts: 8
Joined: Mon Jun 06, 2022 4:41 pm

1.0: Checking or unchecking "Use alpha channel" "Show alpha" has no effect when using "High zoom quality"

Post by lffs »

Subject: 1.0: Checking or unchecking (Menu: View->Use alpha channel), (Menu: View->Show alpha) has no effect when using "High zoom quality".

XnView: MP 1.0 64 bit
OS: Windows 10 21H2 64bit

When viewing a png with transparency and using "High zoom quality", checking or unchecking (Menu: View->Use alpha channel), (Menu: View->Show alpha) has no effect. (This happens sometimes, not on every image. I will upload a sample image)

Effect: When using "High zoom quality", checking or unchecking (Menu: View->Use alpha channel), (Menu: View->Show alpha) has no effect. Please see the attached image.

To reproduce:
1. open a png image with transparency
2. Turn on "High zoom quality", check or uncheck (Menu: View->Use alpha channel), (Menu: View->Show alpha)
3. Problem may occur: The display may change.

Actual behaviour (bug): When using "High zoom quality", checking or unchecking (Menu: View->Use alpha channel), (Menu: View->Show alpha) has no effect.

Expected behaviour: When using "High zoom quality", (Menu: View->Use alpha channel), (Menu: View->Show alpha) options work fine.

Screenshot 1: High zoom quality (ON), Show alpha (ON)
high_zoom_quality_on.jpg
Screenshot 2: High zoom quality (OFF), Show alpha (ON)
high_zoom_quality_off.jpg
Sample images:
sample1.png
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XnTriq
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Joined: Sun Sep 25, 2005 3:00 am
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Re: 1.0: Checking or unchecking "Use alpha channel" "Show alpha" has no effect when using "High zoom quality"

Post by XnTriq »

Confirmed :bugconfirmed:

Only if Bilinear is chosen as the algorithm for High zoom quality in ToolsSettings…ViewView, everything works as expected.