PYRMASK(1)PYRMASK(1)NAMEpyrmask - Blend two images together using Gaussian pyramids.
SYNOPSISpyrmask [ -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
images are combined on the basis of a third "mask" image. The result‐
ing image will contain the inmask image where the mask contains a maxi‐
mum 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
inmask 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 ALSOsmush(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)