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Name

lut - GIPSY 256 color lookup table

Description

lut files are simple ASCII tables with 3 columns, representing the colors Red, Green and Blue resp, scaled between 0.0 and 1.0, for 256 responses between a datamin and datamax (normally taken as 0 to 255.

Format

An example of reading the Red, Green and Blue responses:
  real *coldat[3], *r, *g, *b;
  int ncolors, colnum[3];
  stream instr = stropen(fn,"r");
  colnum[0] = 1;    coldat[0] = r = (real *) allocate(256*sizeof(real));
  colnum[1] = 2;    coldat[1] = g = (real *) allocate(256*sizeof(real));
  colnum[2] = 3;    coldat[2] = b = (real *) allocate(256*sizeof(real));
  ncolors = get_atable(instr,3,colnum,coldat,256);
  if (ncolors != 256) error("Problem %d reading %s",ncolors,fn);

Examples

The ds9 image display server can read the GIPSY lut

See Also

ccdppm(1NEMO)

Author

Peter Teuben

Files


NEMODAT/lut    data files, mirrored from GIPSY’s $gip_dat/lut

Update History


17-dec-03    documentation written (100 years Wright flight)        PJT


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