NAME
Algorithm::Scale2x - Generic implementation of the Scale2x algorithm
SYNOPSIS
use Algorithm::Scale2x;
# optionally exported
# use Algorithm::Scale2x qw( scale2x scale3x );
# To start, you must grab a pixel plus all 8 surrounding pixels
my @pixels = $image->get_pixels( $x, $y );
# scale2x - returns a 2x2 grid of scaled pixels
my @result2x = Algorithm::Scale2x::scale2x( @pixels );
# scale3x - returns a 3x3 grid of scaled pixels
my @result3x = Algorithm::Scale2x::scale3x( @pixels );
DESCRIPTION
This module provides a generic implementation of the Scale2x and Scale3x
algorithms. Scale2x is described as:
...[a] real-time graphics effect able to increase the size of small bitmaps
guessing the missing pixels without interpolating pixels and blurring the images.
METHODS
scale2x( @pixels )
Given a 3x3 grid of pixels (i.e color index numbers), it will expand the
centre pixel into 4 new pixels (i.e. 2x scale).
+---+---+---+
| 0 | 1 | 2 | +----+----+
+---+---+---+ | 4A | 4B |
| 3 | 4 | 5 | => +----+----+
+---+---+---+ | 4C | 4D |
| 6 | 7 | 8 | +----+----+
+---+---+---+
scale3x( @pixels )
Given a 3x3 grid of pixels (i.e color index numbers), it will expand the
centre pixel into 9 new pixels (i.e. 3x scale).
+---+---+---+ +----+----+----+
| 0 | 1 | 2 | | 4A | 4B | 4C |
+---+---+---+ +----+----+----+
| 3 | 4 | 5 | => | 4D | 4E | 4F |
+---+---+---+ +----+----+----+
| 6 | 7 | 8 | | 4G | 4H | 4I |
+---+---+---+ +----+----+----+
SEE ALSO
*
http://scale2x.sourceforge.net/
*
http://scale2x.sourceforge.net/algorithm.html
AUTHOR
Brian Cassidy <
[email protected]>
COPYRIGHT AND LICENSE
Copyright 2007-2009 by Brian Cassidy
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
