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Plan 9 - man page for lam (plan9 section 9)

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LAM(9.1)										 LAM(9.1)

       lam, posit, piccat, picjoin - combine several images

       fb/lam input ...

       fb/posit input ...

       fb/piccat input ...

       fb/picjoin input ...

       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 corre-
       sponding 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.


       picfile(9.6), Thomas Porter and Tom Duff, ``Compositing Digital Images,'' Computer  Graph-
       ics, Vol 18, No. 3 (1984), pp. 253-259

       All pictures must have identical CHAN= attributes.

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