Warp wrote:

>   Note that many image formats have a limit of 65536x65536 pixels. (I don't
> know if PNG has such a limit.)

According to the official PNG specification [which I just happen to have 
on my work PC], the size of the image is specified by the IHDR chunk. 
The maximum value for the width and height in pixels is explicitly 
specified to be  2^31 - 1 (even though the fields are 4-byte unsigned 
integers). It is plausible that some programs might incorrectly support 
2^32 - 1 though.

>   As for POV-Ray itself, I bet the limit is 2147483648x2147483648 pixels
> (or maybe even 4294967296x4294967296 pixels).

Any theories on how many GB of RAM would be required to render that? 
(Assuming you turn off the display preview - apparently some people 
don't know you can do this...)

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