Re: [matplotlib-devel] zooming related bug? fades to white.

[Eric F. <ef...@ha...>]

I have verified this behavior briefly on a Linux machine.  In addition, 
the redraw after zoom gets extremely slow.  I have never worked with the 
image internals and I don't have any idea where the problem is coming from.

Eric

Tim Hirzel wrote:
> To the fantastic matplotlib developers,
> I am having a strange behavior when using zooming.  I have tried it with 
> WX, Wxagg, and TKagg, and with Numeric and numpy.  It occurs in multiple 
> interpolation types as well.   The best way to see this behavior is to 
> use the image_interp.py example.  If you zoom in enough, the image 
> starts to fade to white, and then turn completely white.  If you zoom in 
> to about where the zoom the axes area spans 0.1 units, it should still 
> look fine, but then a span of 0.01 unit will be all white.  If you zoom 
> in slowly to where the color is starting to wash out to white, then 
> resize the window, you will see more strange whitening behavior (the 
> color fluctuates between white and the correct color as you change the 
> window size).   This is on a windows machine with Python 2.4.
> Another clue.  if I save the white appearing axes to a png, it looks fine.
> the way it fades out almost seems like something going wrong with an 
> alpha value somewhere...
> any thoughts?
> 
> thanks,
> Tim