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Date Posted: 07:40:21 10/17/00 Tue
Author: Michel
Subject: Re: JPEG Quality TiffImage
In reply to: Paul Mead 's message, "JPEG Quality TiffImage" on 15:19:45 10/16/00 Mon

Hi Paul,

I am aware about this. Envision uses the popular libtiff library (www.libtiff.org) for tiff

support. It interacts with the Independent Jpeg Group library for JPEG support within tiff

files. Unfornately, it does not provice and easy way to control the JPEG compression/quality

factor. I have added this to the todo list.

For the compression type, there are tiff variations on the jpeg format in tiff files.

Libtiff (thus Envision) uses the most recent specification while some programs don't support

it. I cannot do anything about this.

Best regards,

> Scanning and saving a document as 24bit color bmp file
> Test.bmp 2,466Kb
> Saving JPG at 75%
> Test.jpg 116Kb
> Saving TIFF w jpeg
> Test.tif 340Kb
> There appears to be no easy way to set JPEG Quality
> for Tiff images. Your C file appears to default to
> 75% and if so why the large difference in files, I
> assume some overhead for TIFF.
> Both images appear about the same quality, but thats
> just a quess.
> Also I cannot get Kodak Imaging ( inc with Win98 ) or
> Corel 7 to recognize this compression. It's not
> necessary but it would be nice.
> Paul

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