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Asymmetrical DPI Rendering
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Eric24 View Drop Down
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    Posted: 23 Sep 12 at 10:18PM
Anything on the horizon for asymmetrical DPI rendering?
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AndrewC View Drop Down
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Points: 841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewC Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 12 at 8:46AM
I am wondering why you you need asymmetrical DPI rendering for ?  Fax images ?

Andrew.
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tfrost View Drop Down
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Points: 437 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tfrost Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 12 at 11:58AM
I would be interested in this feature also.  For fax images.  204x196 can be approximated with 200x200, but to create a low-resolution 204x98 you can usually get better quality going direct than converting high to low.
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Eric24 View Drop Down
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Points: 29 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric24 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Oct 12 at 2:25PM
Yes, that's correct. It's subtle, but rendering a fax at 200x200 or 200x100 causes just enough distortion to cause problems. I've experimented with things like rendering at very high resolution (i.e. 400x400 or 600x600) and then resizing the resulting image to 204x196. That actually works reasonably well, but the overhead of rendering such a large file makes it unusably slow.

As-is, the RenderPageToFile or RenderDocumentToFile functions are ideal for my purpose, with the one exception of the single DPI parameter. If it had DPIX and DPIY, I'd be golden!

PS - I'm assuming that using the RenderPageToFile function on a multi-page document that's already been loaded into memory doesn't have to "re parse" the entire PDF file for each call to RenderPageToFile?
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