Imagick::colorizeImage

If you're looking for a solution to fill the image with a solid color, preserving background transparency, here is one way:<?php$im = new Imagick('image.png');$im->setImageAlphaChannel(Imagick::ALPHACHANNEL_EXTRACT);$im->setImageBackgroundColor('color');$im->setImageAlphaChannel(Imagick::ALPHACHANNEL_SHAPE);$im->writeImage('output.png');$im->destroy();?>

To improve upon "php at lfbittencourt dot com"'s solution, this one blends the composited color, and takes opacity into account as well.<?phpclass YourImagick extends Imagick{    public function colorize($color, $alpha = 1, $composite_flag = Imagick::COMPOSITE_COLORIZE)    {        $draw = new ImagickDraw();        $draw->setFillColor($color);        $geometry = $this->getImageGeometry();        $width = $geometry['width'];        $height = $geometry['height'];        $draw->rectangle(0, 0, $width, $height);        $temporary = new Imagick();        $temporary->setBackgroundColor(new ImagickPixel('transparent'));        $temporary->newImage($width, $height, new ImagickPixel('transparent'));        $temporary->setImageFormat('png32');        $temporary->drawImage($draw);        $alphaChannel = $this->clone();        $alphaChannel->setImageAlphaChannel(Imagick::ALPHACHANNEL_EXTRACT);        $alphaChannel->negateImage(false, Imagick::CHANNEL_ALL);        $this->setImageClipMask($alphaChannel);        $clone = $this->clone();        $clone->compositeImage($temporary, $composite_flag, 0, 0);        $clone->setImageOpacity($alpha);        $this->compositeImage($clone, Imagick::COMPOSITE_DEFAULT, 0, 0);    }}?>

Do you want a color overlay with TRUE opacity control? Try this:<?phpclass YourImagick extends Imagick{    public function colorize($color, $alpha = 1)    {        $draw = new ImagickDraw();        $draw->setFillColor($color);        if (is_float($alpha)) {            $draw->setFillAlpha($alpha);        }        $geometry = $this->getImageGeometry();        $width = $geometry['width'];        $height = $geometry['height'];        $draw->rectangle(0, 0, $width, $height);        $this->drawImage($draw);    }}?>How to use:<?php$imagick = new YourImagick('example.png');$imagick->colorize('#ffcc00', 0.35);header('Content-type: image/png');echo $source;?>

The solution published by "olav at redwall dot ee " was adding a black surround outside each non-transparent shape.Here is my improved version :<?phppublic function colorize($color, $alpha = 1){    $geometry = $this->getImageGeometry();    $width = $geometry['width'];    $height = $geometry['height'];            $draw = new ImagickDraw;    $draw->setFillColor($color);    $draw->rectangle(0, 0, $width, $height);    $temporary = new Imagick;    $temporary->setBackgroundColor(new ImagickPixel('transparent'));    $temporary->newImage($width, $height, new ImagickPixel('transparent'));    $temporary->setImageFormat('png32');    $temporary->drawImage($draw);    $temporary->compositeImage($this, Imagick::COMPOSITE_COPYOPACITY, 0, 0);            $this->setImageArtifact('compose:args', ($alpha * 100) . '%,100%');    $this->compositeImage($temporary, Imagick::COMPOSITE_DISSOLVE, 0, 0);}?>

When you're using an image with an alpha channel (for example a transparent png), a value of 1.0 will return a completely transparent image, but a value of 1 works just fine.

simplest example<?php$nombre = '001-4-0043.jpg';$img = new Imagick($nombre);$img->negateImage(false);//$pixblu = new ImagickPixel('#000040');$img->colorizeImage('#0000b0',1.0);header('content-type: image/jpeg');echo $img;?>