Some gifs changes their background when zoomed in/out

[zencd]

Synopsys: some gifs changes their background when zoomed in/out

Reproduction:

1) Open this GIF in xnview 1.90.2 windows xp p2: http://i18.tinypic.com/34ezy9f.gif (it's 100% of size at my PC)

2) It has unexpected black background (while the background is true "white" in windows std viewer)

3) zoom out (eg 70%) -- the background gets white

4) zoom to 100% or more -- it get black again

[xnview]

Synopsys: some gifs changes their background when zoomed in/out

Reproduction:

1) Open this GIF in xnview 1.90.2 windows xp p2: http://i18.tinypic.com/34ezy9f.gif (it's 100% of size at my PC)

2) It has unexpected black background (while the background is true "white" in windows std viewer)

3) zoom out (eg 70%) -- the background gets white

4) zoom to 100% or more -- it get black again

Try the 1.90.3

[zencd]

the same result with 1.90.3

btw, 1.90.2 didn't found that update

[XnTriq]

This seems to be related to the preference settings in View » View » Auto Image Size.
If the image isn't “shrunk” upon opening (No fit or Fit window to image) everything works just fine.

[XnTriq]

Fixed in v1.91!

[zencd]

not fixed for me, the things get even worse a bit with 1.91

1) just opened picture has the same unexpected black background as it was before

2) pressing zooming out, background stays the same black (new behaviour)

[XnTriq]

Hello zencd,

would you please tell us what your settings are for Auto Image Size and High quality zoom (both options are located in Tools » Options... » View » View).

Fixed:

[...]

* Display problem with trasnparent (index) picture and high zoom quality - - http://newsgroup.xnview.com/viewtopic.php?t=12215

[zencd]

"Auto Image Size" == fit to desktop, large only
cannot locate "High quality zoom"

[Clo]

—> zencd

Hello !

• I tested your sample at this moment in 1.91, it's displayed OK !

- I can zoom in - out - restore 1:1 scale - fit to window, the transparency remains perfectly,
I have always the BG colour of my “View” window…

• Same in the browser, as well as the thumb nail as for the preview, I can change the preview size at will, all is right…
- “High quality” is totally disabled here.
- “Use Transparency Index” is enabled.

KR
Claude
Clo

[zencd]

okay; it's a very rare case anyway

[XnTriq]

cannot locate "High quality zoom"

You can see it on your screenshot. It's the field with the two checkboxes (“Reduce”/“Enlarge”).

I was able to reproduce this with Version 1.90.3, but no matter what I try, in v1.91 the bug doesn't occur anymore.

[marsh]

not fixed for me, the things get even worse a bit with 1.91

1) just opened picture has the same unexpected black background as it was before

2) pressing zooming out, background stays the same black (new behaviour)

The problem is fixed for me also- the following option is needed for sample:
Options... View>[x]Use transparent index (<=8 bits) or alpha channel
Hmm... you show that in picture.

[zencd]

yes, the bug has gone when I unchecked that "strange" checkbox ("Use transparent index...")

[Drahken]

I can't reproduce this bug on 1.91, the background always remains white.
Are you certain your upgrade was successful? Have you checked info->about to make sure it says 1.91? Have you tried reinstalling 1.91 to a new folder, make sure you're not getting some sort of holdover bug from some old files?