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Digg  imagecolorset
Set the color for the specified palette index
(PHP 4, PHP 5)
Code Examples / Notes » imagecolorsetdade dot c
this is helpful if you would like to implement a color theme system in your website... try it out Davide Candiloro Italy function colorize ($pngpath, $r, $g, $b) /* REQUIRES: $pngpath to be a valid path of a greyscale PNG-8 image with 64 colors palette $r, $g, $b to be integers in the range 0..255 EFFECTS: returns the png image colorized with the color represented by $r, $g, $b. */ { header("Content-type: image/png"); $im = imagecreatefrompng("images/table.png"); imagetruecolortopalette($im, FALSE, 256); for ($c = 0; $c < 64; $c++){ /*64 is the number of colors in the PNG-8 palette*/ $col = imagecolorsforindex($im, $c); imagecolorset ( $im, $c, $r*$col['red']/256, $g*$col['green']/256, $b*$col['blue']/256); /*replaces original greyscale palette with a colorized one*/ } imagepng($im); imagedestroy($im); } olivier
This function change colors of an image with ranges 0>100 for each primary color: int ImageSelectiveColor (int im, int red, int green, int blue) im is image pointer red, green and blue are ranges 0->100 function ImageSelectiveColor($im,$red,$green,$blue) { for($i=0;$i<imagecolorstotal($im);$i++) { $col=ImageColorsForIndex($im,$i); $red_set=$red/100*$col['red']; $green_set=$green/100*$col['green']; $blue_set=$blue/100*$col['blue']; if($red_set>255)$red_set=255; if($green_set>255)$green_set=255; if($blue_set>255)$blue_set=255; imagecolorset($im,$i,$red_set,$green_set,$blue_set); } return $im; } moxleystratton.com
If you want to convert a Color image to Grayscale without creating a blotchy image, use this color calculation: <?php function imagetograyscale($im) { if (imageistruecolor($im)) { imagetruecolortopalette($im, false, 256); } for ($c = 0; $c < imagecolorstotal($im); $c++) { $col = imagecolorsforindex($im, $c); $gray = round(0.299 * $col['red'] + 0.587 * $col['green'] + 0.114 * $col['blue']); imagecolorset($im, $c, $gray, $gray, $gray); } } ?> info
here's a simple function to greyscale an image... function imagecolorgrey( &$img ) { for( $i=0; $i<imagecolorstotal( $img ); $i++ ) { $c = ImageColorsForIndex( $img, $i ); $t = ($c["red"]+$c["green"]+$c["blue"])/3; imagecolorset( $img, $i, $t, $t, $t ); } } m4551
here's a function to greyscale an image even from a truecolor source (jpeg or png). slightly poor quality, but very fast... function imagegreyscale(&$img, $dither=1) { if (!($t = imagecolorstotal($img))) { $t = 256; imagetruecolortopalette($img, $dither, $t); } for ($c = 0; $c < $t; $c++) { $col = imagecolorsforindex($img, $c); $min = min($col['red'],$col['green'],$col['blue']); $max = max($col['red'],$col['green'],$col['blue']); $i = ($max+$min)/2; imagecolorset($img, $c, $i, $i, $i); } } admin
Here is a function to turn an image into pure black and white <?php function imagepurebw( $img, $amount = 383 ) { $total = imagecolorstotal( $img ); for ( $i = 0; $i < $total; $i++ ) { $index = imagecolorsforindex( $img, $i ); array_pop( $index ); $color = ( array_sum( $index ) > $amount ) ? 255 : 0; imagecolorset( $img, $i, $color, $color, $color ); } } ?> |
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