Re: [Openexr-devel] tips for maximizing write speed?

[Paul Miller]

On 10/30/2012 4:29 PM, Paul Miller wrote:
> On 10/30/2012 3:57 PM, Piotr Stanczyk wrote:
> > Hey - I've not seen that before ... I'll see if I can replicate that
> > at our end.
> >
> > Are you writing scanlines or tiles?
>
> Scanlines. Seems to be in the ZIP compression. When I turn off
> compression it runs nearly as fast as 1.4. I haven't fiddled with the
> other compression options.
>
> I'm not sure if enabling threads will make a difference. I'm pretty much
> using the default constructors for everything.
>
> Thinking I may have built the library with the wrong optimization
> settings, I went back and kicked everything up a notch, but it's still
> quite a bit slower. Checked on both Linux and Windows.
>
> Thanks for checking, Piotr.

Ok I nailed it down. My new exporter is converting the alpha to 4 
channels and saving all 4 channels. 4x slower, duh. Sorry for the false 
alarm.