pixshrink — shrink a color pix file
pixshrink
[-s squareinsize
] [-w in_width
] [-n in_height
] [-f shrink_factor
] [-h ] [-u ] [infile.pix
] >
outfile.pix
Pixshrink
will take a color
pix(5)
format file of given dimensions and produce a smaller
scaled version.
The
-w
and
-n
flags specify the input file width and number of scan lines in pixels.
They can both be set to the same value via
-s.
Defaults of 512 are assumed for unspecified dimensions.
The integer scaling factor is set with the
-w
flag. By default, the factor is 2. Thus, pixshrink forms the logical
opposite of the
pixinterp2x (1)
program.
The program reads the entire image into memory, and then scales the image down to 1/factor the original size in both dimensions.
By default, pixshrink uses boxcar averaging to produce the output pixels from
the input. The
-u
option causes pixshrink to use image undersampling instead.
The
-h
flag causes the frame buffer to be
used in high resolution mode (1024x1024).
This is important for frame buffers such as the Adage which operate
differently depending on the display size. Without this flag
the default size for the selected device will be used (usually
the entire screen).
If the dimensions of the input image are not evenly divisible by the shrink factor, incorrect and bizarre output is generated.