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iffcnv.doc
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1995-11-25
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IFFCNV by Bruce Holloway
Copyright (c) 1987,1988 by Bruce Holloway
This program and documentation may be copied freely so long as this message
and the title screen are left unchanged. By freely copied, I mean without
charge or profit.
Plink: ATARI*TROS
Delphi: ALBATROSS
Usenet: holloway@drivax.UUCP
When I started on this program, there was no way to display IFF files on
the ST. Now there are, but I've gradually been adding to this program, and
it's well on its way to becoming a powerful image processing tool, as well
as an omni-format picture converter similar to PICSWITCH.
You can choose any one of a number of input and output formats...
Input format Output Format
Neochrome (.NEO) Neochrome (.NEO)
DEGAS (.PI?) DEGAS (.PI?)
Tiny (.TN?) IFF (.IFF)
IFF (.???)
Spec512 (.SP?)
And more to be added...
GIF (.GIF) GIF (.GIF)
GEM bitmap(.IMG) Tiny (.TNY)
Spec512 (.SP?)
DIFFERENCES FROM PICSWITCH:
IFFCNV can handle _any_ IFF file - HAM mode, high resolution, interlaced,
monochrome, color - doesn't matter. IFFCNV can read Spec512 files and
convert them to any of the output formats. And IFFCNV will soon handle
GIF files - Compuserve's new graphics standard.
USING IFFCNV
Screen 1: Title Screen
Screen 2: File selector - Select the file to display/convert. Press "Okay"
to continue, or "Cancel" to exit the program.
Screen 3: Conversion parameters
Dither - No Dither - use only the colors available; no blending.
Shade - do normal dithering.
Diamond - on color screens, do another type of dither.
on monochrome screens, do a cumulative error
shading - often produces striking results.
Will port to color screens soon.
Palette - Color - Use all colors.
Monochrome - Use only shades of gray.
Spectrum 512 - Use up to 48 different colors per scanline.
Resolution - Low Res - Convert to ST low resolution (320x200x4)
Medium Res - Convert to ST medium res (640x200x2)
High Res - Convert to ST high res (640x400x1)
Compression - Average - When squashing pictures to fit on a smaller
display, average the pixels.
Dropout - Ignore every other pixel.
Convert - Display picture, converting it first to
indicated resolution.
Display - Display picture in resolution closest to
the original.
Cancel - Return to Screen 2.
Screen 4: "Converting" - Messages displayed while converting the
"IFF Color Pass" picture. This could be anywhere from a
"IFF Display Pass" second to a minute or so.
Screen 5: The Picture. - The picture you've loaded/converted. If
the destination resolution was mono and
you have a color monitor or vice versa,
the display will look a bit munged, but it
will save correctly. Hit any key to proceed
to the next screen.
Screen 6: Output - Select output type, if any.
Amiga .IFF - Output to Interchange File Format.
DEGAS .PI? - Output to DEGAS file format.
Neochrome .NEO - Output to Neochrome. LOW RES ONLY.
View - Look at the picture again.
Save - Save under current name and indicated
extension.
Save As... - Choose a new name.
Cancel - Return to screen 2.
Init Printer - Load a DEGAS printer driver.
Print - Print screen on printer. Must have done an
"Init Printer" first.
NOTES: Most HAM mode pictures use well over a hundred colors. Pictures that
use more than about forty to fifty go beyond IFFCNV's ability to blend them
from the available sixteen colors, so it is usually better to convert them
to monochrome. Try it both ways, of course... 32 color pictures usually
turn out very nicely.
Color during IFF and Spectrum 512 conversions is not supported in medium
resolution; you must use low resolution for color.