Re: resizing gifs

Subject: Re: resizing gifs
From: c -dot- sharp -at- meridio -dot- com
To: techwr-l -at- lists -dot- raycomm -dot- com
Date: Wed, 11 Feb 2004 08:14:45 -0700

I've read through the other answers to this, and there's something
no-one's mentioned, but I've found beneficial when resizing.

GIFS are 256-colour (8 bit images). If, in whatever application you're
using (I'm a PaintShop user), boost this up to 16 million colours (16 bit)
before resizing, you'll get a better quality image, even though it's
reduced back down to 256 colours when you save it as a GIF.

I can't think how to technically explain why this works (fine tech writer
/I/ am!) but it's basically due to the way any blurred parts of the image
change in colour when they're resized. Using 16 million colours allows for
smaller differences in colour between area.

Keeping the horizontal:vertical ratio the same as in the original is only
important if that's the way the outcome is needed.

Catherine Sharp
Technical Writer, Meridio Ltd, Belfast, Northern Ireland

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