<?PHP
/**
*
* imageFiltersIndex
*
* A set of filters that works around the image index, changing it.
*
* It requires GD library.
*
* If you want to add a new filter (like redizer or greenizer) in this class,
* please sent it to Roberto Berto <darkelder@php.net>
*
*
* Main methods:
* - resource Should be used to set a GD image resource to work
*
*
* Currently Filters:
* - grayscale Turn an image grayscale [since 1.0]
* - sepia Turn an image older than it is [since 1.0]
* - yellowize Add a yellow layer in the front of image (transparent or solid) [since 1.0]
*
*
* Usage:
*
* $img_src = ImageCreateFromJpeg("image.jpg");
* $imageFiltersIndex = new imageFiltersIndex;
* $imageFiltersIndex->resource($img_src);
* $imageFiltersIndex->filter([$options1],[$options2,...]);
*
* Where filter is the filter name and $options is a filter option.
* All imageFilterIndex should have some defaults filters options, so you do not need to
* use options if you do not want to.
*
*
* Example:
*
* $img_src_file = "file.jpg";
*
* $img_src=ImageCreateFromJpeg($img_src_file);
*
* $imageFiltersIndex = new imageFiltersIndex;
* $imageFiltersIndex->resource($img_src);
* $imageFiltersIndex->sepia();
*
* header("Content-type: image/jpeg");
* imagejpeg($img_src,"",50);
*
*
* Resources:
* - more filters algorithms at http://www.thecodeproject.com/cs/media/csharpgraphicfilters11.asp (I found
* sepia there. You can get some nice ideas there and submit the filters you wrote here)
* - a nice color class at http://darkelder.users.phpclasses.org/browse.html/package/479.html
*
* @author Roberto Berto <darkelder@php.net>
* @colaborators ??
* @date 2002-11-29
* @license LGPL (http://www.gnu.org/licenses/lgpl.html)
* @changes 1.0 first version
*
*
* Copyright (C) 2002 Roberto Berto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
class imageFiltersIndex
{
var $resource_image = 0;
var $numColors = 0;
/**
* Register the Image Resource (from gd)
*
* Each new image to be filtred must call this register
*
* What it does is set a link to $this->resource_image and
* get the number of colors and set it to $this->numColors
*
* @param int $resource_image GD image resource
*/
function resource($resource_image)
{
$this->resource_image =& $resource_image;
$this->numColors = imagecolorstotal($this->resource_image);
}
/**
* Turn image to Grayscale
*
* The basic of grayscale is that we must turn 3 colors into 1 color.
*
* So, if you sum R+B+G and / 3 you will get just one color and you
* should use this new color in R, B and G.
*
* But, I found on the http://www.thecodeproject.com/cs/media/csharpgraphicfilters11.asp
* that if I multiple, instead of multiple by 1/3, each color by .229, .587 and .114
* and add +3 on the color index, we will get a better image. I have not sure the why.
*
* @param float $rateR the rate of Red in the new color ($rateR/1000)
* @param float $rateG the rate of Green in the new color ($rateG/1000)
* @param float $rateB the rate of Blue in the new color ($rateB/1000)
* @param int $whiteness add more some int on the new color ($newcolor += $whiteness)
*/
function grayscale($rateR = .229,$rateG = .587,$rateB = .114,$whiteness = 3)
{
for ($x = 0; $x < $this->numColors; $x++)
{
$src_colors = imagecolorsforindex($this->resource_image,$x);
$new_color = min(255,abs($src_colors["red"] * $rateR + $src_colors["green"] * $rateG + $src_colors["blue"] * $rateB) + $whiteness);
imagecolorset($this->resource_image,$x,$new_color,$new_color,$new_color);
}
}
/**
* Sepia - make image pretends to be older than it really is
*
* It basicly turn the image grayscale and add some defined
* tint on it: R += 30, G += 43, B += -23, so it will appear a very old picture.
*
* @param int $tintR how much Red to add
* @param int $tintG how much Green to add
* @param int $tintB how much Blue to add
* @param float $rateR the rate of Red in the new color ($rateR/1000)
* @param float $rateG the rate of Green in the new color ($rateG/1000)
* @param float $rateB the rate of Blue in the new color ($rateB/1000)
* @param int $whiteness add more some int on the new color ($newcolor += $whiteness)
*/
function sepia($tintR = 80,$tintG = 43,$tingB = -23,$rateR = .229,$rateG = .587,$rateB = .114,$whiteness = 3)
{
for ($x = 0; $x < $this->numColors; $x++)
{
$src_colors = imagecolorsforindex($this->resource_image,$x);
$new_color = min(255,abs($src_colors["red"] * $rateR + $src_colors["green"] * $rateG + $src_colors["blue"] * $rateB) + $whiteness);
$r = min(255,$new_color + $tintR);
$g = min(255,$new_color + $tintG);
$b = min(255,$new_color + $tintB);
imagecolorset($this->resource_image,$x,$r,$g,$b);
}
}
/**
* Add more yellow
*
* It adds a layout of yellow that can be transparent or solid
* If $intensityA is 255 the image will be 0% transparent (solid).
*
* @param int $intensityA how much strong it will be the yellow (Red and Green) (Something between 0-255)
* @param int $intensityB how much weak will be the Blue (>= 2, in the positive limit it will be make BLUE be 0)
*/
function yelloize($intensityA = 50,$intensityB = 3)
{
for ($x = 0; $x < $this->numColors; $x++)
{
$src_colors = imagecolorsforindex($this->resource_image,$x);
$r = min($src_colors["red"] + $intensityA,255);
$g = min($src_colors["green"] + $intensityA,255);
$b = max(($r + $g) / max($intensityB,2),0);
imagecolorset($this->resource_image,$x,$r,$g,$b);
}
}
}
?>
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