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Re: Ridiculously Enormous PDFs and Printing

On Thursday, July 17, 2003, at 07:07 AM, Robert Clair wrote:

I have an application that does a lot of instancing - essentially the
user can stamp little bits of hi-res bitmap around at various positions,
scales and orientations. Of course I only keep one copy of each bitmap
and draw it where ever it is required. The problem comes when you print -
the printing architecture makes 1 copy of the bitmap each time you draw it.
It doesn't know from Form Xobjects or anything like that.

This can lead to absurd situations - I have one test file whose spool file
was heading past 4 Gig when I killed it, three hours into the process. From
previous experiments it would have taken days to print on my dumpy little
HP 842C. This for a design that stores in about 5 Meg in the app's file format
and draws on the screen in less than a second.

Hi Bob,

I haven't actually verified this myself, but I've been told that if you do your drawing using CoreGraphics and use the same CGImage instance to do all of your 'stamping' into a CG PDF context, that it will generate PDF that contains the bitmap data only once. Apparently higher level APIs (Cocoa and Carbon) tend to create new CGImage wrappers around the bitmap data each time they draw, so CoreGraphics doesn't realize it is the same image repeated.

Like I said, I haven't tested this myself, but it might be an approach to try first, rather than jumping directly into generating PS or PDF manually.

Hope this helps,
- Greg
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 >Ridiculously Enormous PDFs and Printing (From: Robert Clair <email@hidden>)



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