Path: utzoo!attcan!uunet!lll-winken!lll-tis!mordor!joyce!ames!mailrus!tut.cis.ohio-state.edu!mdf
From: mdf@tut.cis.ohio-state.edu (Mark D. Freeman)
Newsgroups: comp.sys.ibm.pc
Subject: Re: vga to ega conversion
Message-ID: <21665@tut.cis.ohio-state.edu>
Date: 13 Sep 88 01:42:56 GMT
References: <2777@jpl-devvax.JPL.NASA.GOV> <21324@tut.cis.ohio-state.edu> <2811@jpl-devvax.JPL.NASA.GOV>
Reply-To: mdf@tut.cis.osu-state.edu (Mark D. Freeman)
Organization: CompuServe; Columbus, OH. (personal guest account) at Ohio State U.)
Lines: 25

In <2811@jpl-devvax.JPL.NASA.GOV> carlos@beowulf.JPL.NASA.GOV (Carlos Carrion) writes:
>I write:
>>>if I take a vga .GIF picture, how can I get an ega .GIF reader
>>>to display the pix?  I understand that the resolutions and # of bit planes
>>>are different.  can it be done?

>	I just realized what the problem is.  It's not a conversion problem I
>have; the problem is that I don't have a vga graphics card, so naturally my
>gif reader reading a vga pix tries to enable a graphics mode that is
>non-existent on my ega card.

No!!!!!

All you need is a GIF reader that works with the EGA.  EGAGIF, PICEM,
or FASTGIF are good examples.  Nothing in the GIF file has any effect
on what video mode the reader program uses.  You are probably using
VGIF or another VGA-specific reader program.  At the most basic level,
there is no such thing as a VGA GIF picture.  It may be 320x200x256,
but if you display it on an EGA you will see 320x200x16 or 640x200x16
or whatever mode you tell your reader program to use.  It'll probably
default to 640x350x16, but many have options.
-- 
Mark D. Freeman						  (614) 262-1418
Applications Programmer, CompuServe	      mdf@tut.cis.ohio-state.edu
[70003,4277]			      ...!att!tut.cis.ohio-state.edu!mdf
Columbus, OH		      Guest account at The Ohio State University