LAM(9.1) LAM(9.1)
NAME
lam, posit, piccat, picjoin - combine several images
SYNOPSIS
fb/lam input ...
fb/posit input ...
fb/piccat input ...
fb/picjoin input ...
DESCRIPTION
Lam overlays (laminates) several picture files, writing the resulting picture file to standard output. The output WINDOW= attribute is the
smallest rectangle that contains all of the input rectangles. Each pixel of the output image takes its value from the last-mentioned input
image that covers that pixel. Output pixels not covered by any input image are set to zero.
Posit performs similarly, except that output pixels are computed by compositing the corresponding input pixels, with later input pictures
over earlier ones. If the input images have no a channel, posit has the same effect as lam.
Piccat concatenates a list of picture files, each above the next, writing the result to standard output. The width of the output file will
be that of the widest input picture. If any of the input pictures are more narrow than that, the space to their right will be zero in the
output picture.
Picjoin is similar, but joins the pictures left-to right.
SOURCE
/sys/src/fb/lam.c
/sys/src/fb/posit.c
/sys/src/fb/piccat.c
/sys/src/fb/picjoin.c
SEE ALSO
picfile(9.6), Thomas Porter and Tom Duff, ``Compositing Digital Images,'' Computer Graphics, Vol 18, No. 3 (1984), pp. 253-259
BUGS
All pictures must have identical CHAN= attributes.
LAM(9.1)
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PCP(9.1) PCP(9.1)
NAME
pcp - copy pictures
SYNOPSIS
fb/pcp [ -wx0 y0 x1 y1 ] [ -ox y ] [ -ttype ] [ -cchannels ] [ -Cchannels ] [ -mcolormap ] [ -M ] [ input [ output ] ]
DESCRIPTION
Pcp copies the input picture (default standard input) to the output file (default standard output). Options control the attributes and
content of the output picture.
-w x0 y0 x1 y1
causes only the given window of the input picture to be copied. By default the whole picture is copied.
-o x y causes the output picture's WINDOW= attribute to be translated by adding (x,y) to the input window coordinates.
-t type
sets the TYPE= attribute of the output file. The default is to use the input file's type.
-c channels
causes only the given channels of the input picture to be copied. The default is to copy all channels. If channels not present in
the input picture are specified, they are computed in the ``most plausible'' way. For example, a missing alpha channel is set to
255, and an m channel will be synthesized from rgb channels by computing NTSC luminance. A 0 in channels causes a zero channel to
be written.
-C channels
sets the output CHAN= attribute. Channels must be the same length as the selected channels of the input picture.
-m colormap
attaches the given color map to the output.
-M elides the color map from the output.
SOURCE
/sys/src/fb/pcp.c
SEE ALSO
picfile(9.6), cmap(9.6)
PCP(9.1)
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