TH LUM 9.1
SH NAME
lum \- compute luminance
SH SYNOPSIS
B fb/lum
[
I input
]
SH DESCRIPTION
I Lum
computes the luminance of the input picture using the NTSC formula
IR L =.299 R +.587 G +.114\f2B\f1.
Pixel values are mapped through the input image's color map, if any.
The resulting image is written to standard output.
SH SOURCE
B /sys/src/fb/lum.c
SH "SEE ALSO
IR picfile (9.6)

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