Re: Gifs and Jpegs on a IIgs?

[spec@vax2.concordia.ca (Mitchell Spector)]

In article gberigan@cse.unl.edu (Greg Berigan) writes...
>
>There was an old program called IIGIF that would create GIFs.

	This is incorrect. IIGIF can only view GIF images (in either
Single or Double Hi-Res), not create them. Although it's author, Jason 
Harper, did later write another program that would view and create GIF 
format on the IIgs (SHRConvert, which later grew into SuperConvert).

>There was another that would turn GS graphics to GIFs (even supported all
>16 palettes) but I don't remember its name.

	I can think of three such programs for the IIgs, which would
be SuperConvert, The Graphic Exchange and GIFfy-Save. I wrote details
on each in the original follow-up to the thread.

>I don't think there are any programs out there that create JPGs on a
>IIgs.  The only type of commonly used GS graphic file that would need
>JPG encoding would be 3200-color images.  Anything else can be encoded
>as a GIF.  (Does the Second Sight card create new GS graphic file
>formats resulting in more that 256 possible colors?)

	I think there may be a shell utility (requires Orca or GNO)
which can create JPEG from other existing image files, although there's
little point in doing so. Most multi palette Super-Hi-Res images
are 8-bit color at most, even the majority of 3200 color images rarely
exceed a total of 256 distinct colors (there may be 200 separate palettes,
but often colors are repeated more than once in each 16-color palette).
The only advantage then would be the higher compression used by JPEG.

	The Second Sight has no software to create images, just view
them (unfortunately, thus far graphic viewers are all that basically
exist for the card).

Mitchell Spector
spec@vax2.concordia.ca