CLR2GRAY

Section: User Commands (1)
Updated: 25-Jun-90
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NAME

clr2gray - Convert color images to grayscale

SYNOPSIS

clr2gray [ -r<red> -g<grn> -b<blu> ] [ -<type> ] < color > gray

DESCRIPTION

Converts a color image (8bit or 24bit) to an 8 bit grayscale image. It works for both mapped and unmapped color inputs.

OPTIONS

-r<num>,-g<num>,-b<num>: weights, used to convert the triple <red,green,blue> to a scalar intensity value. If one or more weights are specified, those not specified default to zero. If no weights are specified, NTSC weights (29.9% red, 58.7% green, 11.4% blue) are used.
-B: face format, as used by Bennet Yee's face program at CMU.
-F: FBM, format (by default, the default). You are guaranteed not to lose information by specifying FBM as the default.
-G: GIF, Compuserve GIF format.
-I: IFF format, interleaved bitmaps (ILBM), used by Amigas.
-P: PBM, Jef Poskanzer's bitmap format.
-S: sun, Sun rasterfiles (not run length encoded).

EXAMPLE

To convert a mapped color image in FBM format to a Sun format grayscale image:

% clr2gray -S < foo.fbm > foo.8bit

To extract the red color plane from an image and write the result in FBM format:

% clr2gray -r1 -F < foo.fbm > red.fbm

Note that since the green and blue weights were not specified, they defaulted to 0, and the result is that only the red plane is used.

BUGS

None known.

HISTORY

Copyright (C) 1989,1990 by Michael Mauldin. Permission is granted to use this file in whole or in part for any purpose, educational, recreational or commercial, provided that this copyright notice is retained unchanged. This software is available to all free of charge by anonymous FTP and in the UUNET archives.

25-Jun-90 Michael Mauldin at Carnegie Mellon University: Release 1.0 mlm@cs.cmu.edu
07-Mar-89 Michael L. Mauldin at Carnegie Mellon University: Beta release (version 0.9) mlm@cs.cmu.edu

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