izoom(6D)

NAME
     izoom - magnify or shrink an image

SYNOPSIS
      /usr/sbin/izoom inimage outimage xscale yscale [-i -b -t -q -m or -g]
                                                     [-w blurfactor]

DESCRIPTION
     izoom 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.