imagecolorset

(PHP 4, PHP 5, PHP 7, PHP 8)

imagecolorset — Establecer el color para el índice de paleta especificada

Descripción

imagecolorset(
    resource $image,
    int $index,
    int $red,
    int $green,
    int $blue,
    int $alpha = 0
): void

Establece el índice especificado en la paleta para el color especificado. Esto es útil para crear efectos parecidos al relleno en imágenes con paleta sin el overhead de la ejecución del relleno actual.

Parámetros

image: Un recurso image, es devuelto por una de las funciones de creación de imágenes, como imagecreatetruecolor().
index: Un índice en la paleta.
red: Valor del componente rojo.
green: Valor del componente verde.
blue: Valor del componente azul.
alpha: Valor del componente alfa.

Valores devueltos

No devuelve ningún valor.

Historial de cambios

Versión	Descripción
5.4.0	Se añadió el parámetro `alpha`.

Ejemplos

Ejemplo #1 Ejemplo de imagecolorset()

<?php
// Crear una imagen de 300x100
$im = imagecreate(300, 100);

// Establecer el fondo a rojo
imagecolorallocate($im, 255, 0, 0);

// Obtener el índice de color del fondo
$fondo = imagecolorat($im, 0, 0);

// Establecer el fondo a azul
imagecolorset($im, $fondo, 0, 0, 255);

// Imprimir la imagen en el navegador
header('Content-Type: image/png');

imagepng($im);
imagedestroy($im);
?>

Ver también

imagecolorat() - Obtener el índice del color de un píxel

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User Contributed Notes 10 notes

down

moxleystratton.com ¶

18 years ago


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);
    }
}
?>

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heavyraptor2 at hotmail dot com ¶

16 years ago


I've been looking for a simple function which "colorizes" an image, without any success ... it looks like a lot of people mean something different with "colorizing" an image, because actually colorzing means multiplying the old color's grayscale with the new color. So a white pixel would become 100% of the colorize-to-color and a black pixel would stay black (I know I can't explain well ... I hope you understood, otherwise take a look at the example below the functions' code).

<?php
function image_colorize(&$img,$rgb) {
  imageTrueColorToPalette($img,true,256);
  $numColors = imageColorsTotal($img);

  for ($x = 0; $x < $numColors; $x++) {
    list($r,$g,$b) = array_values(imageColorsForIndex($img,$x));

    // calculate grayscale in percent
    $grayscale = ($r + $g + $b) / 3 / 0xff;

    imageColorSet($img,$x,
      $grayscale * $rgb[0],
      $grayscale * $rgb[1],
      $grayscale * $rgb[2]
    );
  }

  return true;
}
?>

Example of usage:
<?php
$color = array(0xff,0xaa,0x2a); // color to convert to
$url = 'http://sundog.net/images/uploads/1_google_logo.jpg';
$img = imageCreateFromJpeg($url);

image_colorize($img,$color);

header('Content-type: image/gif');
imageGif($img);
exit;
?>

Enjoy

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m4551 at abasoft dot it ¶

20 years ago


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);
    }
}

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Thomas Mueller ¶

16 years ago


Here is a function to colorize a picture gradient style.

All you have to do is to pass an img-object and an array of colors.

e.g.

$arr = array('#000000', '#990000', '#00FFFF', '#FFFFDD');
colorize ($img, $arr);

<?php
function colorize($imgdata, $palette)
{
    imageTrueColorToPalette($imgdata,false,0xFF);
    $l = count($palette)-1;
    $i = imagecolorstotal($imgdata);
    while ($i--)
    {
        list($r,$g,$b) = array_values(imageColorsForIndex($imgdata,$i));
        
        $grayscale = ($r*.3 + $g*.59 +$b*.11) / 0xFF;
        
        $pos = $l*$grayscale;
        
        $perc = $pos-floor($pos);
        
        $tbase = str_replace("#", '', $palette[$pos]);
        $baseR = hexdec(substr($tbase,0,2));
        $baseG = hexdec(substr($tbase,2,2));
        $baseB = hexdec(substr($tbase,4,2));
        
        $tmix = str_replace("#", '', $palette[$pos+1]);
        $mixR = hexdec(substr($tmix,0,2));
        $mixG = hexdec(substr($tmix,2,2));
        $mixB = hexdec(substr($tmix,4,2));
        
        $resR = $baseR+($mixR-$baseR)*$perc;
        $resG = $baseG+($mixG-$baseG)*$perc;
        $resB = $baseB+($mixB-$baseB)*$perc;
        
        imagecolorset($imgdata, $i, $resR, $resG, $resB);
    }
}
?>

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dade dot c at email dot it ¶

20 years ago


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);
}

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Daniel Klein ¶

9 years ago


If you are creating a palette image from scratch you have to use imagecolorallocate() for each index before you can use imagecolorset() on it.

down

-1

olivier at moostik dot net ¶

23 years ago


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;

 

 }

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-1

Bartman ¶

15 years ago


I had the same problem as heavyraptor2 so i made this function...
<?php
function imagecolorize($im,$endcolor){
    //funcion takes image and turns black into $endcolor, white to white and
    //everything in between in corresponding gradient
    //$endcolor should be 6 char html color

    //make sure it has usable palette
    if (imageistruecolor($im)) {
        imagetruecolortopalette($im, false, 256);
    }

    //first make it gray to be sure of even results (thanks moxleystratton.com)
    //comment this loop if you want the output based on, for example, 
    //the red channel (for this take a look at the $gray-var in the last loop)
    for ($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);
    }

    //determine end-colors in hexdec
    $EndcolorRGB['r'] = hexdec( substr($endcolor, 0, 2));
    $EndcolorRGB['g'] = hexdec( substr($endcolor, 2, 2));
    $EndcolorRGB['b'] = hexdec( substr($endcolor, 4, 2));

    //determine gradient-delta's
    $stepR = (255-$EndcolorRGB['r'])/255.0;
    $stepG = (255-$EndcolorRGB['g'])/255.0;
    $stepB = (255-$EndcolorRGB['b'])/255.0;

    //aColor contains the 256 gradations between endcolor(i=0) and white(i=255)
    $aColor = array();
    for ($i = 0; $i<=255; $i++){
        $aColor[$i]['r'] = $EndcolorRGB['r'] + ($i*$stepR);
        $aColor[$i]['g'] = $EndcolorRGB['g'] + ($i*$stepG);
        $aColor[$i]['b'] = $EndcolorRGB['b'] + ($i*$stepB);
    }

    //for every color-index we now replace $gray-values for $aColor
    for ($c = 0; $c < imagecolorstotal($im); $c++){
        $currentColorRGB = imagecolorsforindex($im, $c);
        $gray = $currentColorRGB['red'];//image is grayscale, so red,green and blue
        // should be equal. We use this number as key of aColor
        imagecolorset($im,$c,(int)$aColor[$gray]['r'], (int)$aColor[$gray]['g'], (int)$aColor[$gray]['b']);
    }
}?>

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-1

admin at phpgfx dot com ¶

17 years ago


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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-2

info at devking dot com ¶

22 years ago


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 );    
 }
}

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