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Re: [RFC] Reading images
From: |
Pete French |
Subject: |
Re: [RFC] Reading images |
Date: |
Mon, 22 Sep 2003 12:29:05 +0100 |
> 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.
- Re: [RFC] Reading images, (continued)
- Re: [RFC] Reading images, Adam Fedor, 2003/09/15
- Re: [RFC] Reading images, Alexander Malmberg, 2003/09/21
- Re: [RFC] Reading images, Pete French, 2003/09/21
- Re: [RFC] Reading images, Alexander Malmberg, 2003/09/21
- Re: [RFC] Reading images, Pete French, 2003/09/21
- Re: [RFC] Reading images, Alexander Malmberg, 2003/09/21
- Re: [RFC] Reading images, Pete French, 2003/09/21
- Re: [RFC] Reading images, Alexander Malmberg, 2003/09/21
- Re: [RFC] Reading images, Pascal J . Bourguignon, 2003/09/22
- Re: [RFC] Reading images, Pete French, 2003/09/22
- Re: [RFC] Reading images,
Pete French <=
- Re: [RFC] Reading images, Pascal J . Bourguignon, 2003/09/21
- Re: [RFC] Reading images, Pete French, 2003/09/21
Re: [RFC] Reading images, Adam Fedor, 2003/09/22