[Qgis-developer] Bug in rendering Rasters in QGIS 2.4 2.6 and 2.8 in Windows

[Frank Sokolic]

I can confirm this behaviour. I am getting it when displaying a 
georeferenced jpg using QGIS 2.8.1 64 bit (standalone installer) running 
on Windows 8.1.

When zooming in or out the raster image sometimes doesn't display. I've 
tried it with OTF both on and off and the bug still occurs.

I've also tried changing the rendering behaviour in the Options > 
Rendering dialogue. The bug occurs irrespective of whether "User render 
caching" and "Render layers in parallel" are on or off.

Regards, Frank.



On 01/04/2015 13:04, SBP wrote:
> Dear All,
> I had posted this in QGIS users list but I did not get any feedback. While
> using the latest QGIS 2.8 ( 64 bit ) in Windows XP/7/8/8.1 in 6 laptops, I
> found that large ( 300+ mb Landsat with 6 band image )raster images failed
> to redraw while I zoomed in/out or while panning. This behaviour was so
> random that I was forced to recommend 2.2 to all the users who are supported
> by my team.
>
> It is not possible to use raster images for interpretation as the images do
> not appear when we zooming or panning. I have placed a video where I have
> compared the behaviour in 2.8 vs 2.2. A raster and a vector are shown. You
> will be able to see that the raster disappears randomly and does not redraw
> even if we pan or zoom. It reappears randomly.
>
> Video Link : https://www.youtube.com/watch?v=Wjly6C445uE&feature=youtu.be
>
> I tested this in Macbook Pro with Qgis2.6 and I did not see this problem so
> it might be only seen in windows systems.
>
> I hope this will be looked into at the earliest.
>
> Thank you for your time.
> Regards,
> Sitansu Pattnaik
> kCube Consultancy Services
>
>
>
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