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PYRMASK(1)		    General Commands Manual		    PYRMASK(1)

NAME
       pyrmask - Blend two images together using Gaussian pyramids.

SYNOPSIS
       pyrmask [ -l levels ] [ -o outfile ] inmask outmask maskfile

DESCRIPTION
       Pyrmask	blends	two  images together by	first breaking the images down
       into separate bandpass images, combining	 these	separate  images,  and
       then  adding  the  new bandpass images back into	a single output	image.
       This can	produce	very seamless blends of	digital	images.	 The  two  im-
       ages  are combined on the basis of a third "mask" image.	 The resulting
       image will contain the inmask image where the mask contains  a  maximum
       value  (255) and	the outmask image where	the mask contains zeros.  This
       is done on a channel by channel basis, i.e. the	maskfile  should  have
       data  in	each channel describing	how to combine each channel of the in-
       mask and	outmask	images.	 All three images must have exactly  the  same
       dimensions (both	image size and number of channels).  For best results,
       it's often useful to filter the	mask  image  a	little	with  smush(1)
       first.

OPTIONS
       -l levels
	      How  many	 pyramid  levels  to  use  (maximum is log(2) of image
	      size).

       -o outfile
	      If specified, output will	be written to this file, otherwise  it
	      will go to stdout.

SEE ALSO
       smush(1), rleswap(1), urt(1), RLE(5),
       Burt  and Adelson, "A Multiresolution Spline With Applications to Image
       Mosaics", ACM Transactions on Graphics, October 1983, V2	#4, p. 217.
       Ogden, Adelson, Bergen and Burt,	"Pyramid-based Computer	Graphics", RCA
       Engineer, Sept/Oct 1985,	p. 4.

AUTHOR
       Rod Bogart

BUGS
       The current implementation has very strict requirements for image sizes
       and dimensions.	The extensive use of floating point computation	 makes
       it  very	 slow for normal sized images.	It also	keeps all of the band-
       pass images in core at once, which  requires  considerable  amounts  of
       memory.

       Pyrmask	is  built  on  top  of a library of functions for working with
       Gaussian	pyramids.  This	library	has yet	 to  be	 documented  or	 fully
       tested.

4th Berkeley Distribution	  Nov 8, 1987			    PYRMASK(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | AUTHOR | BUGS

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