RE: PDF graphics bewilderment

[Dov Isaacs <isaacs@xxxxxxxxx>]

Acrobat 4.0x has a known problem in that indexed color (i.e. GIF and
grayscale TIFF under Windows) images don't downsample or compress.
This is fixed in Distiller 5.

        - Dov


At 7/26/2001 01:16 AM, Thomas Michanek wrote:
>> It's the downsampling that's killing your screenshots. Bitmap formats just
>> don't survive that sampling. Stick with 8-bit Zip compression.
>
>I assume you know the difference between downsampling and compression.
>I failed to mention that I have also tried 8-bit ZIP compression,
>and the results are exactly the same, i.e. the problems with my
>images are not the effect of any lossy compression (like JPEG).
>
>We prefer to downsample to keep the PDF file size smaller. It's
>not a general problem with downsampling, as it only affects some
>of the images (see my original message). We can of course settle
>with no downsampling if there's no other way, but I'd like to know
>why apparently some images are downsampled and others are not.
>
>I've been told there are bugs in Acrobat 4 with downsampling
>and/or compression. Can anyone elaborate?
>
>
>- - - - - - - - - - - - - - - - - - - - - -
>Thomas Michanek, Technical Writer
>IAR Systems AB, Sweden: http://www.iar.com
>mailto:Thomas.Michanek@iar.se
>Tel: +46 18 167800, Fax: +46 18 167838
>- - - - - - - - - - - - - - - - - - - - - -
>
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