Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!agate!eos!barry From: barry@eos.UUCP (Kenn Barry) Newsgroups: comp.sys.amiga Subject: Re: Amiga-->Mac graphics conv. Summary: It can be done, period. Message-ID: <1493@eos.UUCP> Date: 10 Sep 88 06:05:44 GMT References: <45600049@uxe.cso.uiuc.edu> <462@dcdwest.UUCP> Reply-To: barry@eos.UUCP (Kenn Barry) Organization: QQQCLC Lines: 62 In article <462@dcdwest.UUCP> steve@dcdwest.UUCP (Steve Meloche) writes: >Yes, it can be done, but there are some holes left in the process. There >is nothing as yet (that I have seen) that deals with HAM (or halfbright) >IFF pictures. Gee, am I the only Usenetter that still has a Compuserve account? Actually, the situation is better than that. There is a HAM to GIF converter called 'amgif', which I downloaded from Compuserve (it's in the 'PICS' forum). It works fine. I've included an excerpt from the doc file for this program below. It won't handle halfbright mode, but are there even any pictures *in* halfbright mode? >Actually, there is one other problem. All picture conversion utilities >suffer from one oversight - they don't handle 320x400 IFF pics >correctly. You must convert to another resolution to use Macview (and >IFFGIF) if you want a picture that isn't stretched. 'amgif' doesn't have this problem. I just converted a 320x400 HAM picture to GIF, and then viewed it on my Amiga. It has the same aspect ratio as the original IFF picture. >Maybe >someone out there could write the ULTIMATE conversion utility? >P-p-p-pleeeeeeeze? I really would like a (fast) HAM -> 256 color GIF >converter!! Well, it ain't all that fast (8-15 minutes for large HAM pics), but it certainly works. Here's the excerpt from the docfile I promised: ------------------------------------------------------------------------ AMGIF vn 0.5 - Amiga IFF to GIF converter Converts Amiga IFF pictures to GIF. Supports 320x200 & 320x400 in up to 32 colors or HAM mode, and 640x200 & 640x400 in up to 16 colors. HAM mode pictures are reduced to 256 colors. [...] HAM images can take a significant amount of time to encode, mainly due to the calculations required to sort and remap the colors. HAM images are reduced to a 256 color map, choosing the most frequently used colors for the color map, and remapping all the other used colors to the nearest match in that color map. Many HAM images will not suffer much from this. Others may suffer significantly. It depends on the image. Note that AMGIF doesn't do Extra-Halfbrite pics currently, mainly because I don't know the format for them and have none to test with. I suspect that they will be incorrectly identified as HAM pics. This may be added later. [...] -->Steve Bennett Compuserve:[70046,441] 01/03/88 ------------------------------------------------------------------------ Until this recent discussion, I'd assumed that this program, and the Amiga GIF viewer that displays GIF files with >32 colors in HAM mode, were widely available. Perhaps I was wrong. Should I consider posting these programs here? I only have the binaries, but I can post uuencoded versions of them if there is sufficient interest. If you think I should, send me email. Also, where should I post 'em, if I do? The delay factor on comp.binaries.amiga is infamous, but posting programs to comp.sys.amiga is still a no-no, yes? - From the Crow's Nest - Kenn Barry QQQCLC NASA-Ames Research Center Moffett Field, CA ----------------------------------------------------------------------------- ELECTRIC AVENUE: {most major sites}!ames!eos!barry