RE: TIF or GIF?

Subject: RE: TIF or GIF?
From: "Susan W. Gallagher" <sgallagher -at- kinzan -dot- com>
To: "TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com>
Date: Wed, 17 Jan 2001 12:39:28 -0800

> Sean Brierley observes <<I did not think GIF was lossy... As for
> limitations, GIF is limited to 256 colors. If that matters.
> TIFF supports
> CMYK values.>>
>
Geoff Hart answers:
> Because the original image may have many more than 256 ...

And Dick Margulis said something similar...

Just wait a minute, there, guys. Let's not go redefining our terms
in mid-conversation here! ;-) GIFs are not lossy; JPGs are. Here's
why.

Whether you lose color or resolution during the original conversion
is immaterial. You can create a GIF with a specific resolution and
number of colors, then edit it and resave it without losing resolution
or color depth. That's not lossy. You cannot pick up a JPG, edit it and
resave it, and wind up with the same quality file you started with.
Each time you run the compression algorithim, you lose resolution.
That's what lossy means.

<hrumph!> ;-)

Sue Gallagher
sgallagher -at- kinzan -dot- com

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