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#1 Posted : Tuesday, June 27, 2006 1:02:43 PM(UTC)

MrWayne  
MrWayne

Groups: Registered
Posts: 14


We have recently modified our code to include anti-aliasing of image files through use of

SetDisplayMode( DISPLAYMODE_SCALETOGRAY, DISPLAYMODE_SCALETOGRAY );

This works for TIF images. 

We also unlocked support for reading and writing PDF files and this works.  For our PDF images, however, the anti-aliasing is not working.  The code that reads the PDF image modifies the resolution from 72x72 to 300x300.

I have attached a (zipped) sample PDF document.  I would appreciate any suggestions you might have to get the anti-aliasing working.

Thanks.

File Attachment(s):
pdf0000029.zip (227kb) downloaded 24 time(s).
 

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#2 Posted : Wednesday, June 28, 2006 4:20:38 AM(UTC)

Bashar  
Guest

Groups: Guests
Posts: 3,034

Was thanked: 2 time(s) in 2 post(s)

This is a 24-bit file.  The DISPLAYMODE_SCALETOGRAY
mode works for 1-bit images only.  Load the file as a 1-bit file and with a high DPI (e.g. 300) and it should work.

 
#3 Posted : Wednesday, June 28, 2006 4:43:25 AM(UTC)

MrWayne  
MrWayne

Groups: Registered
Posts: 14


Thank you.  Adding nDisplayDepth = 1 to the FILEPDFOPTIONS settings fixes the problem.
 
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