The program has not been tested with IFF files from the IBM PC version of Deluxe Paint II.
It won't convert Hi-res (interlaced) pictures, if it finds a picture with a resolution greater than 256, it skips every other line to produce a lo-res picture.
It won't work with the Amiga's 64colour Xtra-half brite mode (brite is NOT a spelling mistake - thats how Commodore spell it!). If it does come across a 6 bit-plane picture (64colours) it assumes its a HAM picture(4096colours)
It won't Multi-task under RISC-OS, however there are two good reasons for this :-
1. When the AmigaLoad program is constructing the picture it requires the whole screen so that it can ScreenSave the finished screen.
2. The programming of RISC-OS windows is beyond me!
With the amiga's 32 and 4096 colour modes, certain sacrifices have to be made as the Arc hasn't got any equivalent modes. Hence for both modes I convert to 256 colours. Converting to 256 colours poses more problems however, so with 320 resolution pictures the program uses 640 resolution and dithers colours to try to achieve a better result. Sometimes however the pictures come out better without this dithering so you can choose to switch it off. This is done when the program asks - 'Perform 3bit dithering (Y/N)', all you have to do is reply 'N'.
How to transfer IFF files between the Amiga and the Arc.
This could be done with a serial lead, however that sounds like too much hard work for me. What we did was to transfer the AmigaDOS files to MS-DOS using DOS-2-DOS and then convert them to ADFS using the PC-Emulator's putfile command. However to demonstrate the program I have put some sample IFF pics in the IFF directory. Some of the more astute of you will have noticed that one of the pictures is used as the loaders Icon!
The other way around???
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For those of you out there who are interested in sending Arc pictures to the Amiga, a friend of mine has written a 16 colour Arc loader for the Amiga. Contact me if you're interested.(NB. I can't guarantee his program will be PD.)
Help wanted !!!!
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When the program converts to 256 colours with dithering it uses the best algorithm I could work out - However I am sure there is a much better way of doing it, If anybody has worked out a good way to simulate more colours in 256 colours modes I would be glad to hear from you. Ideally what I need is a routine that will take R,G,B in 4bits(16levels) and return the colour (or colours) needed to reproduce the colour.
Contact
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Tom Simpson
15 Parkland Road
Norman Hill
Dursley
Glos. GL11 5RP.
PS. Although this program is PD if anybody feels it is good enough to warrant a small cash contribution I won't say no!
PPS. Clares new Armadeus software claims to load Amiga Format Samples - If they are saved on the Amiga as straight dumps (not IFF) the conversion is relatively easy. The Amiga stores 8bit samples without a sign bit (ie. 0 to 255) whereas the Arc does (-128 to 127) once you know that, converting them requires only a simple 10 line BASIC program.