IZOOM(6D)IZOOM(6D)NAMEizoom - magnify or shrink an image
SYNOPSIS
/usr/sbin/izoom inimage outimage xscale yscale [-i -b -t -q -m or -g]
[-w blurfactor]
DESCRIPTIONizoom magnifies or shrinks an image with or without filtering. xscale
and yscale are floating point scale factors. The filtering method is one
pass, uses 2-d convolution, and is optimized by integer arithmetic and
precomputation of filter coefficients. Normally izoom uses a triangle
filter kernel in both x and y directions.
The -i (impulse) option causes izoom to do no filtering as the image is
resized. The -b (box) option causes izoom to use a box as the filter
kernel. The -t (triangle) option is the default. The -q (quadratic)
option indicates that a quadratic function should be used as the filter
kernel. The -m option uses a Mitchell kernel and the -g option uses a
Gaussian kernel. The -w blurfactor option specifies the width of the
reconstruction filter. This will effect how blurry the resulting image
is. If you want more blur use a larger number. The default value is
1.0.
NOTE: izoom does not work on dithered images which are nothing more than
color look-up table indices. To perform any such image processing one
must first use something like fromdi (in the moregltools subsystem, and
also can be found in /usr/people/4Dgifts/iristools/imgtools/fromdi.c),
which converts the dithered image into an RGB image.
Page 1
