Re: .jpg viewer for IIGS?

[zelix@drift.winternet.com (Peter Handel)]

In article <17FEB199511120393@vax2.concordia.ca>,
Mitchell Spector <spector@vax2.concordia.ca> wrote:

>	Don't forget Prism's TrueColor function. It allows you to view
>a small portion of any GIF/TIFF/IFF/etc as if you were viewing it on a
>Macintosh or IBM with _real_ 8-bit+ color support. R-G-B info is not
>separated as it is in SuperConvert, you actually see the image as-is,
>the only drawback is only a small window area. 

That's a pretty severe drawback :)  

>I'm not sure how this
>is accomplished, but my guess is a 3200 image flipped sideways (200
>colors per scanline) and then mirrored back. This would explain why
>it's 16 pixels wide, 200 pixels long. It also uses a kind of HAM
>mode to do 32 pixels across in "wide" mode (thus the flicker). This 
>is all guessing of course... :) 

What I think it does is simply use one 16 color palette per line.
The wide is probably done with the same technique, but places these
next to each other and switches them on and off really fast so that
our eyes are tricked into believing that it's two wide.

>>screen size limitation such as SuperConvert.  The only nice thing
>>about SuperConvert is its ability to save files as GIFs (only 16
>>colors tho) and load _a lot_ of formats.                 ^^^^^^^
> ^^^^^^
>
>	That's incorrect, SuperConvert v3.00 and v3.01 allow you to
>create GIF images in 16 or 256 colors. I've loaded in multi-palette
>Super-Hi-Res images and exported them as 256 color GIFs. I know the
>resulting output GIF files come out okay as I've converted them on
>IBMs and Macintosh systems. All IIgs palette data is preserved.

I think the multi-palette modes are pretty useless imho.  It takes
an extremely long time to work (ie djpeg :)  ) and often produces
a picture that is one pixel wide or something messed up like that.

>Mitchell Spector
>m_spect@pavo.concordia.ca / spector@vax2.concordia.ca


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