Re: [RFC] Reading images

[Pete French]

> When is a screen device ever assumed to be 72 dpi? I don't assume that

Next black hardware ? Plus I thought 72 points per inch was the assumed
default resolution for PostScript. e.g. the following file should always
produce a 1inch black square should it not ?

%!PS-Adobe-3.0
0 setgray
72 72 moveto  0 72 rlineto 72 0 rlineto 0 -72 rlineto closepath fill
showpage

...thats probably where the screen assumption comes from thinking about
it, assuming the DPS engine also fires up with that assumption.

> Depends. If you just want to use it to render back to the device, it's a
> good thing that the image is in device resolution. If you want an image
> with a specific size in pixels, you'll need to figure out the
> transformation between user space and image space (that's the 'Matrix'
> entry) so you know what size the original rectangle you draw in should
> be.

O.K., I'm convinced my code is wrong :-) Will go back and take a look
at it and see if I can find a nice easy way round it.

-bat.