NAME

card, ramp - create simple color fields

SYNOPSIS

fb/card [ -crgba ] [ -wx0 y0 x1 y1 ] red [ green blue ] [ alpha ]

fb/ramp [ -v ] [ -wx0 y0 x1 y1 ] [ [ leftcolor ] rightcolor ]

DESCRIPTION

Card writes a constant (all pixels equal) picture on standard output. The red, green blue and alpha arguments are numbers between 0 and 255. Green and blue default equal to red. Alpha defaults to 255. Option -c specifies the CHAN= attribute of the picture file. The default is CHAN=m, CHAN=ma, CHAN=rgb, or CHAN=rgba depending on which of red, green blue and alpha are specified.

Ramp creates a picture file whose pixel values range from leftcolor to rightcolor across each scan line, writing on standard output. Leftcolor defaults to 0; rightcolor defaults to 255. If three arguments are given for leftcolor and rightcolor the output will have CHAN=rgb. Otherwise, it will have CHAN=m.

Option -v causes ramp to make a vertical ramp (leftcolor at the top, rightcolor at the bottom).

For both commands, option -w specifies the size of the picture. The default gives WINDOW=0 0 1280 1024.

SOURCE

/sys/src/fb/card.c
/sys/src/fb/ramp.c

SEE ALSO

picfile(9.6)