On Tue, 2010-04-13 at 21:05 -0700, Andreas Raab wrote:
> Hi Ross -
> 
> Profiling is your friend. In most cases, 95% of the time are spent in 5% 
> of the code. From what you're saying below it sounds that you're using 
> one of the 'special' PNG modes (black and white, or gray-scale) that 
> probably have seen less attention for optimization than others. Any 
> chance you can post a sample image for profiling it?

I've attached a test image, which takes about 30 seconds for me.  It is
a 1 bit depth image.  Not sure if the attachment will make it
through....

Ross
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