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imagecolorset

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

imagecolorsetBir palet indisi için renk tanımlar

Açıklama

imagecolorset(
    GdImage $görüntü,
    int $indis,
    int $kırmızı,
    int $yeşil,
    int $mavi,
    int $alfa = 0
): ?false

Belirtilen palet indisine belirtilen rengi tanımlar. Bir paletli görüntünün renklerini boyama işlevlerini kullanmadan değiştirmek için yararlıdır.

Bağımsız Değişkenler

görüntü

imagecreatetruecolor() gibi bir görüntü oluşturma işlevinden dönen bir GdImage nesnesi.

indis

Palet içinde bir indis.

kırmızı

Kırmızı bileşenin değeri.

yeşil

Yeşil bileşenin değeri.

mavi

Mavi bileşenin değeri.

alpha

Alfa bileşeninin değeri.

Dönen Değerler

Başarı durumunda null, başarısızlık durumunda false döner.

Sürüm Bilgisi

Sürüm: Açıklama
8.0.0 görüntü bağımsız değişkeninde artık bir GdImage nesnesi aktarmak gerekiyor; evvelce resource türünde geçerli bir gd değeri gerekirdi.

Örnekler

Örnek 1 - imagecolorset() örneği

<?php
// 300x100 bir görüntü oluşturalım
$im = imagecreate(300, 100);

// Artalan rengi kırmızı olsun
imagecolorallocate($im, 255, 0, 0);

// Artalan renginin indisini alalım
$bg = imagecolorat($im, 0, 0);

// Artalan rengini mavi yapalım
imagecolorset($im, $bg, 0, 0, 255);

// Görüntüyü tarayıcıya gönderelim
header('Content-Type: image/png');

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

Ayrıca Bakınız

add a note

User Contributed Notes 10 notes

up
4
moxleystratton.com
17 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);
}
}
?>
up
3
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
up
2
dade dot c at email dot it
19 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);
}
up
2
m4551 at abasoft dot it
19 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);
}
}
up
1
Thomas Mueller
15 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, $resB);
}
}
?>
up
1
Daniel Klein
8 years ago
If you are creating a palette image from scratch you have to use imagecolorallocate() for each index before you can use imagecolorset() on it.
up
0
Bartman
14 years ago
I had the same problem as heavyraptor2 so i made this function...
<?php
function imagecolorize($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']);
}
}
?>
up
-1
olivier at moostik dot net
22 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;

}
up
-2
admin at phpgfx dot com
16 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 );
}
}

?>
up
-2
info at devking dot com
21 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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