Flicker in Fullscreen zoom

Bugs found in XnView Classic. Please report only one bug per topic!

Moderators: XnTriq, xnview

cumulus31
Posts: 2
Joined: Sun Nov 23, 2008 8:10 pm

Flicker in Fullscreen zoom

Post by cumulus31 » Sun Nov 23, 2008 8:31 pm

Hello,

If I zoom through many steps in normal windows than i'ts a smooth picture changeover between zoom steps. It looks nearly like a camera-zoom. But in fullscreen mode, there are black flashs between steps, this is a bit disturbing. (Perhaps it's only with my computer configuration. XP with monitor 2560x1600 pixels).

Greetings Werner

karol_blazewicz

fullscreen zoom behavior

Post by karol_blazewicz » Sun Jan 04, 2009 5:14 am

I experience the same annoying behaviour as cumulus31. The image is "flickering" for a split-second before it zooms - you can reproduce the bug by blinking every time you zoom in/out an image ;-)
I've just upgraded to 1.95.4 from an old version (1.80 if I remember correctly) that didn't exhibit this kind of fullscreen zoom-related problems.
I have WinXP Pro SP3.

[case analysis]
I get it only when I move to Fullscreen from Viewer. If I pick an image in the Browser mode and hit F11 or click on the pretty picture on the taskbar, I can zoom in, out and around just fine.
Zooming in Viewer and preview in Browser works fine.

I've tried different settings in General > Keyboard/Mouse > Switching modes

B - Browser
F - Fullscreen
V - Viewer

B > F > V
B > V > F

produce the unwanted behaviour.

B <> F | V <F> F transitions are broken.
Yes, I also think that B > F > V should be working fine, but it somehow isn't.
If you push Num1 in Fullscreen a couple times you get pretty ugly flickering (I think this is the easiest way to check which setting produce this unwelcome behaviour).


[suggested fix] / not really a fix :( /
For me choosing starting mode as Fullscreen - Browser avoids the problem, but it still exists. You can find this setting in General at the very bottom.
It also takes a bit longer to show the image this way.


[the rest]
I don't know if it can be mitigated by some change in the options, I think I tried everything, but I might be wrong. Setting the background (in Fullscreen) to white helped a bit - especially if the image you're zooming is mostly white - but the problem didn't go away.

Using hq zoom makes matters worse because it takes longer for the image to be zoomed, and the flashes across the picture are more pronounced.

I work with jpg, gif (still and animation) and png files - all of them exhibit such behaviour (so this isn't file-type related I guess). The bigger the files, the worse it looks (it's not a technical point, just the perceived change from bad to worse as the files are bigger or more zoomed in i.e. cover more screen).

Renamed xnview.ini to .bak - default settings are of no help, the problem still lives.
I even uninstalled XnView, restarted cpu and installed again - didn't help.
Rebuild thumbnail cache - done that, still nothing.
Zooming w/ mousewheel doesn't help.


[the end]
If you have any questions, need more info or have any suggestions - you are all welcome.
And the usual excuse for misspellings etc.: it's the middle of the night where I live, so please, point them out, but bear in mind that I'm old, my eyes are weak an so on ;-)

Karol Blazewicz

User avatar
xnview
Author of XnView
Posts: 31121
Joined: Mon Oct 13, 2003 7:31 am
Location: France
Contact:

Re: fullscreen zoom behavior

Post by xnview » Sun Jan 04, 2009 2:55 pm

Do you have tried to disabled option/Fullscreen/Use delayed...?
Pierre.

karol_blazewicz

Re: fullscreen zoom behavior

Post by karol_blazewicz » Sun Jan 04, 2009 3:43 pm

I've tried it and still nothing.
The only thing that solves the problem (not by fixing, but by avoiding) is starting in Fullscreen - Browser and setting B <> F | V <> F as the only way to go from Browser to Fullscreen.


[errata]
Seems that (with a little help of the software running the forum) I managed to mangle my previous post, it should read
B <> F | V <> F
works fine for the first part. Seems that V > F transitions are broken.
not
B <> F | V <F> F transitions are broken.
Remember kids to use "Disable HTML in this post" when necessary :)

Eve

Post by Eve » Sat Mar 07, 2009 11:47 pm

Same problem here with 1.96 (and previous), option/Fullscreen/Use delayed option disabled.
Thanks.

Eve

Post by Eve » Sun Mar 08, 2009 12:23 am

 
I forgot to mention that i've tested it on 4 different Pc. Thanks again.
 

roi
Posts: 5
Joined: Fri Jan 15, 2010 5:37 am

Re: different fullscreen zoom behavior

Post by roi » Fri Jan 15, 2010 5:44 am

 
This issue still exist on 1.97, may you fix it ? . Thank you very much .

User avatar
JohnFredC
XnThusiast
Posts: 2010
Joined: Wed Mar 17, 2004 8:33 pm
Location: Sarasota Florida

Re: different fullscreen zoom behavior

Post by JohnFredC » Fri Jan 15, 2010 4:53 pm

Confirmed... (ATI 9600XT) exactly as described.

No flicker seen if full-screen from Browser.

Flicker very obvious if full-screen from View.

Funny, I never noticed that before. :(
John

User avatar
helmut
Posts: 8153
Joined: Sun Oct 12, 2003 6:47 pm
Location: Frankfurt, Germany

Re: different fullscreen zoom behavior

Post by helmut » Sun Jan 24, 2010 2:03 pm

Confirmed, too. NVIDIA GeForce 9400 GT on Windows XP SP3. Well spotted!

roi
Posts: 5
Joined: Fri Jan 15, 2010 5:37 am

Re: Flicker in Fullscreen zoom

Post by roi » Fri Jun 11, 2010 5:47 pm

 
This issue exist on 1.97.5, may you fix it ? . Thank you very much .
 

User avatar
xnview
Author of XnView
Posts: 31121
Joined: Mon Oct 13, 2003 7:31 am
Location: France
Contact:

Re: Flicker in Fullscreen zoom

Post by xnview » Wed Apr 13, 2011 1:26 pm

Please try 1.98 beta3
Pierre.

roi
Posts: 5
Joined: Fri Jan 15, 2010 5:37 am

Re: Flicker in Fullscreen zoom

Post by roi » Thu Apr 14, 2011 1:10 pm

 
Fixed, thanks :!: :!:
 

marsh
XnThusiast
Posts: 2443
Joined: Sun May 15, 2005 6:31 am

Re: Flicker in Fullscreen zoom

Post by marsh » Thu Apr 14, 2011 3:32 pm

I think beta3 change makes redrawing of screen considerably slower.

User avatar
xnview
Author of XnView
Posts: 31121
Joined: Mon Oct 13, 2003 7:31 am
Location: France
Contact:

Re: Flicker in Fullscreen zoom

Post by xnview » Thu Apr 14, 2011 3:57 pm

marsh wrote:I think beta3 change makes redrawing of screen considerably slower.
??? How that, only a change in the zoom function...
Pierre.

marsh
XnThusiast
Posts: 2443
Joined: Sun May 15, 2005 6:31 am

Re: Flicker in Fullscreen zoom

Post by marsh » Thu Apr 14, 2011 4:08 pm

xnview wrote:
marsh wrote:I think beta3 change makes redrawing of screen considerably slower.
??? How that, only a change in the zoom function...
Yes, I see b3 difference only when using zoom keys. My first impression was probably mistaken. I don't notice any speed difference in presentation after trying it again. :? Zoom steps: fixed at 10%, pressing key a dozen times or so.

Post Reply