Question on the handling of GIF’s

R
Posted By
Rene
Feb 8, 2007
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328
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Is there any good or pratical reason why the possibilities for the manipulation of GIF-files are so hugely limited within Photoshop??

I understand the indexed color brings some limitations, but even the most basic of transformations like rotate or mirror are unavailable for a GIF-file. It’s pretty annoying……..

R.
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J
jaSPAMc
Feb 8, 2007
On Thu, 8 Feb 2007 22:13:21 +0100, "Rene" found these unused words floating about:

Is there any good or pratical reason why the possibilities for the manipulation of GIF-files are so hugely limited within Photoshop??
I understand the indexed color brings some limitations, but even the most basic of transformations like rotate or mirror are unavailable for a GIF-file. It’s pretty annoying……..
Convert in MODE to RGB, then save back …
T
Tacit
Feb 9, 2007
In article ,
"Rene" wrote:

Is there any good or pratical reason why the possibilities for the manipulation of GIF-files are so hugely limited within Photoshop??

Yes. Because they are indexed color, they have a maximum of 256 colors. When you rotate an image, Photoshop must interpolate the image, and doing this requires more than 256 colors.

Were you to rotate or perform other image manipulations on a GIF, the result would look like crap, and then you’d go into a Photoshop newsgroup and say "Hey, what’s wrong with Photoshop? Every time I try to rotate a GIF, the image quality degrades dramatically!"

Convert to RGB. Always keep an RGB copy of your original working file; you should not have an image whose only format is GIF.

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N
nomail
Feb 9, 2007
tacit wrote:

In article ,
"Rene" wrote:

Is there any good or pratical reason why the possibilities for the manipulation of GIF-files are so hugely limited within Photoshop??

Yes. Because they are indexed color, they have a maximum of 256 colors. When you rotate an image, Photoshop must interpolate the image, and doing this requires more than 256 colors.

Photoshop lets you rotate an indexed color image without any limitation. Yes, the result may be poor (unless you rotate +/- 90° or 180°), but Photoshop certainly does not prevent you doing it anyway.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.com
E
edjh
Feb 9, 2007
Rene wrote:
Is there any good or pratical reason why the possibilities for the manipulation of GIF-files are so hugely limited within Photoshop??
I understand the indexed color brings some limitations, but even the most basic of transformations like rotate or mirror are unavailable for a GIF-file.

Umm. That’s not true. Select All and Transform allows you to do those things without changing color mode.

It’s pretty annoying……..
R.

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