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REPOST: Lossless PDF scaling
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REPOST: Lossless PDF scaling


  • Subject: REPOST: Lossless PDF scaling
  • From: Kirk Kerekes <email@hidden>
  • Date: Mon, 6 May 2002 09:59:30 -0500

Subject: Lossless PDF scaling

Explanation by example:

I have a pdf image composed as a 11x17 inch page, in an NSData, say.

I want to convert it into a pdf image that is internally scaled losslessly to a 8.5x11 page.

"Losslessly" means that a 72dpi bitmap embedded in the original 11x17 image will draw as a 144dpi bitmap in the 8.5x11 image. It means that all of the non-bitmap drawing operations in the pdf will be appropriately scaled to fit in the new page size, and will continue to be "resolution independent"
.

I have tried every juggle with NSImage and NSImageRep and NSPDFImageRep et al that I can think of. I currently get (relative to the above example) one of the following results:

1) a 72dpi bitmap of the entire page, scaled or unscaled.
2) a 144dpi bitmap of the entire page, scaled.
3) The original pdf, at the original size.
4) Various interesting reports from the Console crash log.

I have tried many things that, based on the documentation, ought to work. But if they did, you wouldn't be reading this now.

I know it can be done, because I can take the 11x17 pdf, drop it onto Preview, do a print-to-Preview, and what comes out is exactly what I want to get.

Wisdom, anyone?
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