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Crawly Crypt Collection 1
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graphics
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tgatospc
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tgatospc.txt
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1992-04-06
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Targa to Spectrum Converter V0.5
Copyright (c) 1992 John Stanford
Developed for:
Lexicor Software Corp.
58 Redwood Rd.
Fairfax, CA 94930
(518)-453-0271
◆
◆
◆
This program is FREEWARE.
A FREEWARE program is one which you may freely distribute, but
you cannot charge for it or alter the program or contents of the
documentation in any manner.
==================================================================
This program is designed to allow ST users of Lexicor's Prism
Render to view their rendered images with as high a color
resolution as a standard Atari ST will allow. It will load a targa
file created by Prism Render into memory and display it on the
Screen as a Spectrum image. The image may then be saved as a SPC
compressed Spectrum file.
Minimum Hardware Requirements:
- Atari ST, STe or Mega STe with color monitor.
- 1/2 meg or more memory.
Spectrum images will not display properly on an accelerated ST or
a TT.
----------------------------------------------------------------
To run the program double click on the file TGATOSPC.PRG while in
ST medium resolution. The main screen will appear with options to
convert a targa file or exit the program.
Selecting CONVERT TARGA will display an alert box asking for the
color palette to use in the Spectrum image, 512 colors or 4096
colors. Standard Spectrum images use the 512 color palette. When
used on an STe or Mega STe it is possible to use the extended
4096 color hardware palette in a Spectrum image. 4096 color
Spectrum images can be viewed with most Spectrum slide show
viewers, though they cannot be viewed with SPECTRUM 512 or
UNISPEC. 4096 color Spectrum images will still display normally on
a 512 color ST.
After the color palette is selected the file selector is displayed
to choose a targa TGA file. Double click on the name of the file
to convert. The program will then begin converting the image.
The screen will blank and the picture will begin drawing from
bottom to top. The image will look awfull! This is because of the
way Spectrum images are stored in memory. When the conversion
process has finished the image will then be displayed with the
appropriate colors.
Once the Spectrum image is displayed pressing the space bar will
clear the screen and display a file selector to save the SPC
spectrum file. Type in the name of the file desired and press
enter to save the image.
After saveing the spectrum image the main screen will reappear and
another targa file may be converted, or one may exit the program.
-----------------------------------------------------------------
CAVEATS
----------------------------------------------------------------
The converter will only handle a small subset of the legal targa
file formats. It will only convert 24bit uncompressed unmapped
images saved in bottom to top format. It will handle any targa
file Prism Render generates, but will probably fail with TGA files
created by other packages. An alert box will be displayed if the
converter doesn't handle the selected TGA file.
All Targa images are scaled to a 320x200 resolution. Targa images
created in 320x200 and 512x384 resolution will display properly,
but other resolutions may exhibit aspect ratio errors. No anti-
aliasing or pixel blending is performed when converting images
with resolutions larger than 320x200.
Spectrum images created with the 4096 color palette will
frequently exhibit color streaks or patches that are improperly
colored. The Spectrum format only allows a limited number of
colors (14) on each segement of a scan line. Using the 4096 color
palette greatly increases the probability that this color limit
will be exceeded and color fitting errors will result.
In spite of these limitations it is hoped that this program will
increase the enjoyment and use of Prism Render by ST users.
Any and all comments and suggestions are welcome! I can be reached
on Genie as J.STANFORD2, or c/o Lexicor through the address
above.
John Stanford 4-6-92
====================================================================
This program is supplied in the belief that it operates as
specified, neither the author nor Lexicor shall not be liable in
any circumstance whatsoever for any direct or indirect loss or
damage to property incurred or suffered by the customer or any
other person as a result of any fault or defect in the goods or
services supplied by the author and in no circumstances shall the
author or Lexicor liable against consequential damage or loss of
profits (whether or not the possibility thereof was separately
advised to it or reasonably forseeable) arising from the use or
performance of such goods or services.