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Date Posted: 07:18:03 10/15/02 Tue
Author: Michel
Subject: Re: What TIF is used to save?
In reply to: Rob 's message, "What TIF is used to save?" on 09:52:15 10/12/02 Sat


Hi Rob,

It depends what compression you use. Many tiff viewers support different compression. Envision uses libtiff, www.libtiff.org and has a fairly complete compression support.

JPG compression in TIFF has been quite confusing. There was the original spec which had problems, and was then revised. Envision uses the revised spec (latest), but some viewers like Imaging for Windows uses the previous version.

When using JPG compression in TIFF, it is not possible to change the compression level.

Best regards,

Michel

>I just checked the demo out, and am wondering what
>format is a color image saved when selecting TIF?
>
>I opened a JPG image in the demo.exe file, saved as
>TIF. Then I tried to open in other software, and it
>would not open in many! eg Microsoft Windows Picture
>and Fax Viewer that usually opens TIF files on my
>system. I did get it to open in Photoshop, but not
>other "lesser" graphics systems.
>
>It has to be storing TIF image files in some weird
>format to be so hard to recognize. Also, the file size
>is SMALLER than the jpg image file, yet it states the
>library does not support LZW compression, so if this
>is not being used, something has to be thrown out as
>jpg does indeed use compression!
>
>What tif format is used to save, and can you adjust
>the jpg compression when saving using the components?

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