Anti-Aliasing works for TIF but not for PDF

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

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

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 32 time(s).


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

Bashar

Groups: Guests
Posts: 3,022

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

Groups: Registered
Posts: 14

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

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