OK. That turned out to be the problem.

The original scan resulted in a 3MB file measuring 7312x4467 at 96dpi.

When I reduced it to 50%, it still did not work, but at 10% it original size, it did display.

I suppose I could experiment to find the largest workable resolution.

Thanks,
Kevin

Yeah, that was probably a 3MB TIFF file?

The size of a black and white TIFF file can be kind of misleading, it is able to compress white areas a whole lot, like instead of storing 3000 white pixels in a row, it is able to store just one marker that says "next come 3000 of the same color".

But the texture sent to the video card is not able to handle this kind of compression, it has to expanded to full pixel size. Also right now it is expanded to full 32-bit color depth as well.

So that multiplies the size of the raw data quite considerably - 7312x4467 at 32-bit color depth adds up to 124MB fully expanded.


I should be able to tune this up a bit - instead of just trying to use the maximum theoretical texture size supported by the card, I can probably figure out some way to look at how much memory is available and resize it to fit within a more reasonable amount of memory. I'll make a note to take a look at this later.

- Michael