Re: .jpg viewer for IIGS?

[jamesb@ecst.csuchico.edu (James L Brookes)]

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. 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 

I don't exactly understand your explanation above; it's actually really
simple.  If you only display 16 pixels horizontally of an image, you can
use the 3200 technique to display any of 4096 colors with those 16 pixels.
Therefore, you could actually view something in 12 bit color (although
most things will, of course, be 8 bit color).  "Wide" mode just displays
strips alternately, so the flickering you're seeing is an artifact of the
slow draw/erase cycle....

>Mitchell Spector
>m_spect@pavo.concordia.ca / spector@vax2.concordia.ca
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|          James Brookes                    jamesb@ecst.csuchico.edu       |
| "I *used* to think that 90% of everything is crap - then I found USENET" |
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