NAME

rletorla - convert a Utah RLE image file into a Wavefront "rla" or "rlb" image file.

SYNOPSIS

rletorla [ -b ] [ -h ] [ -v ] [ -o outfile ] [ infile ]

DESCRIPTION

This program converts Utah RLE(5) image files into Wavefront "rla" or "rlb" image files. Rletorla will handle four types of RLE files: Grayscale (8 bit data, no color map), Pseudocolor (8 bit data with a color map), Truecolor (24 bit data with color map), and Directcolor (24 bit data, no color map). In each case the resulting Wavefront image file will contain RGB data as well as a matte channel. If no alpha channel is found in the RLE file, the Wavefront matte channel will be computed using the RGB or mapped data. The entire area of the Wavefront image will be run length encoded. The size of the Wavefront "bounding box" data structure will be set to that of the total image area.

NOTE: Even though images of any size can be converted, Wavefront is very fussy about image dimensions. Normally, the converted image must be one of the following sizes or Wavefront will complain with "ERROR, cannot open image file filename, error -8":

646x485 (0-645x0-484) ntsc_4d
720x486 (0-719x0-485) qtl_ntsc
636x484 (0-635x0-483) iris_ntsc
1024x1024 (0-1023x0-1023) 1k_square

To get around this problem, the aspect ratio field in the Wavefront "rla" file will be "faked" with "ntsc_4d" for all formats that do not match one of those shown above. This way, Wavefront will find a valid format string, and any image size will be readable. "rlb" image file do not have this limitation.

OPTIONS

-b: This option will cause rletorla to create a Wavefront "rlb" image file instead of using the default "rla" conversion.
-v: This option will cause rletorla to operate in verbose mode. Header information is printed to "stderr".
-h: This option allows the header of the RLE file to be dumped to "stderr" without converting the file. It is equivalent to using the -v option except that no file conversion takes place.
-o outfile: This option allows the name of the output file to be specified. Re-directing standard output as is done with most all other toolkit utilities is not permitted here because the resulting "rla" or "rlb" file is not written sequentially.
infile: The name of the RLE image data file to be converted. The name of the resulting Wavefront file will be derived from the name of the input file (unless the -o option is used) -- the extension will be changed from "rle" to "rla" or "rlb". (Note: if you use the extended input file names described in urt(1), this will result in a very strange filename for the Wavefront file.)

EXAMPLES

rletorla -v lenna.rle: While running in verbose mode, convert lenna.rle to Wavefront rla format and store resulting data in lenna.rla.
rletorla -h test.0001.rle: Dump the header information of the RLE file called test.0001.rle.
rletorla -b -o junk.rlb test.rle: Convert test.rle into a Wavefront "rlb" file called junk.rlb.

AUTHOR