TIFF images size can be smaller if you use CCITT group4 for black/white, and compression (zip) in grayscale/color.
I somehow remember that you can generate PDF/A with these compressed TIFFs.
Yan Han
-----Original Message-----
From: etd-l Discussion List [mailto:[log in to unmask]] On Behalf Of Thomas Dowling
Sent: Thursday, September 10, 2009 8:02 AM
To: [log in to unmask]
Subject: Re: Image Formats in ETD PDF Files
I can't imagine any reason to use GIF for any images*. PNG can do everything
GIF can and more, with smaller file sizes and no necessary restriction to 256
colors (state o' the art in 1989...). As John already pointed out, the PDF/A
standard doesn't restrict file formats, but thinking a few decades down the
line, it might matter that PNG and JPEG are open standards while GIF is a
proprietary format.
To reduce file sizes, you might include relatively small JPEGs in the PDF, with
archival quality TIFF, PNG, or JPEG kept as separate files.
(*OK, maybe one: there are relatively simple code libraries to generate images
on the fly - real-time charts and graphs, for example - and they've tended to
favor GIF output. But that doesn't seem like a common need in an ETD.)
Thomas Dowling
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On 09/10/2009 10:10 AM, Martin Courtois wrote:
> Is there any reason students should not insert JPG, GIF, or PNG files in their ETDs? I'm thinking in terms of ETDs that will be archived in PDF/A. Is there any reason one or more of these formats should not be used in a PDF/A document?
>
> We've encouraged students not to insert TIFF files in their ETDs, mainly because of file size issues. If there's a strong need to provide TIFF images, we suggest the student submit these as separate files. We haven't set any restrictions on the use of JPG, GIF, or PNG formats, and I just want to make sure we're not missing something.
>
> Thanks for your help,
>
> Marty
>
> Martin Courtois
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