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Topic: Re: Setting dpi attribute when adding an image to PDF
Conf: (P-PDF) Developers, Msg: 58506
From: LeonardR
Date: 5/29/2002 05:32 PM

At 09:01 PM 11/8/2001 +1100, p-pdf-developer Listmanager wrote:
>I am using the PDFLibrary to insert images (currently JPEG) into a PDF
>file, I am creating.


>When I insert an image which has a resolution other than 72dpi, I get bad
>result in the PDF file (disorted image). Is there a way to pass the dpi
>information on image creation (using PDE, of COS level methods).

You don't pass dpi - you pass the image's size (height and width
in pixels!) and bit depth, and that information is then used to determine
dpi. Unless you are changing the CTM for the image, you should always
adjust image sizes to 72dpi before placing into PDF.

So if you have an image that is 2x2 at 144 dpi - it's really 4x4
at 72dpi. AND if you want it to fit in a 3x3 area, you have to either rely
on Acrobat to scale OR you do it yourself before placement.

>Another question is, that I get a bad image also when the image I am
>inserting was resized (from original image). What information I need, for
>the image to be right.

It really sounds like you are passing potentially wrong info to
PDEImage, or that PDEImage is doing the wrong thing. I don't use PDEdit
myself - I prefer the old fashioned way of CosObj's and stream writing...


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