Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mephisto!ncar!ico!ism780c!randvax!ucla-an!stb!gendep!craig
Newsgroups: comp.sys.ibm.pc
Subject: Re: Converting MAC to IBMPC format
Keywords: graphics
Message-ID: <64JsD1w160w@gendep>
Date: 30 Jan 90 03:12:52 GMT
References: <484464f0.144c9@byzantine.UUCP>
Organization: General Depravity 1 213 447 1543
Lines: 19

fraserr@byzantine.UUCP (Ross Fraser) writes:

> I recently downloaded VPIC.ARC from the SIMTEL archives, and it works great.
> According to the documentation, it will allow viewing of Mac-Paint files.
> My question is..How do you convert a Mac file to IBM format? Is disk format a
> operating system the only differences, such that I could download MAC files
> using a modem to my PC, or is it more complicated than that? Does an EGA
> monitor have enough resolution for displaying MAC pictures?

I believe the Macintosh screen is organized as a simple linear bitmap,
with 1 bit per pixel (we're talking black-and-white Macs here).  So the
top left-corner pixel would be the high bit of the first byte of the
image data, and the bottom right-hand pixel would be the low bit of the
last byte.  So to view this on an EGA, some translation of the image
would be required, and your viewing utility has to know how to handle
whatever header data or compression scheme may be involved.

The original Mac display was 592 x 350 (?) pixels, so EGA in 640 x 350
ought to be able to handle it once you've converted the image.