Add colorize logic.

src/Drivers/Gd/GdDriver.php

@@ -289,6 +289,21 @@ public function contrast(float $level): self
         return $this;
     }
 
+    public function colorize(int $red, int $green, int $blue): ImageDriver
+    {
+        $this->ensureNumberBetween($red, -100, 100, 'red');
+        $this->ensureNumberBetween($green, -100, 100, 'green');
+        $this->ensureNumberBetween($blue, -100, 100, 'blue');
+
+        $red = round($red * 2.55);
+        $green = round($green * 2.55);
+        $blue = round($blue * 2.55);
+
+        imagefilter($this->image, IMG_FILTER_COLORIZE, $red, $green, $blue);
+
+        return $this;
+    }
+
     public function manualCrop(int $width, int $height, int $x = null, int $y = null): self
     {
         $cropped = new Size($width, $height);
@@ -341,4 +356,9 @@ public function focalCrop(int $width, int $height, $cropCenterX = null, $cropCen
 
         return $this;
     }
+
+    public function sepia(): ImageDriver
+    {
+        // TODO: Implement sepia() method.
+    }
 }

src/Drivers/ImageDriver.php

@@ -36,6 +36,10 @@ public function contrast(float $level): self;
      */
     public function blur(int $blur): self;
 
+    public function  colorize(int $red, int $green, int $blue): self;
+
+    public function sepia(): self;
+
     public function getSize(): Size;
 
     public function fit(Fit $fit, int $desiredWidth = null, int $desiredHeight = null): self;

src/Drivers/Imagick/Helpers.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Spatie\Image\Drivers\Imagick;
+
+class Helpers
+{
+    public static function normalizeColorizeLevel(float $level): float
+    {
+        if ($level > 0) {
+            return $level/5;
+        } else {
+            return ($level+100)/100;
+        }
+    }
+}

src/Drivers/Imagick/ImagickDriver.php

@@ -4,6 +4,7 @@
 
 use Imagick;
 use ImagickDraw;
+use ImagickPixel;
 use Spatie\Image\Drivers\Concerns\CalculatesCropOffsets;
 use Spatie\Image\Drivers\Concerns\CalculatesFocalCropCoordinates;
 use Spatie\Image\Drivers\Concerns\ValidatesArguments;
@@ -224,6 +225,25 @@ public function contrast(float $level): self
         return $this;
     }
 
+    public function colorize(int $red, int $green, int $blue): ImageDriver
+    {
+        $this->ensureNumberBetween($red, -100, 100, 'red');
+        $this->ensureNumberBetween($green, -100, 100, 'green');
+        $this->ensureNumberBetween($blue, -100, 100, 'blue');
+
+        $quantumRange = $this->image->getQuantumRange();
+
+        $red = Helpers::normalizeColorizeLevel($red);
+        $green = Helpers::normalizeColorizeLevel($green);
+        $blue = Helpers::normalizeColorizeLevel($blue);
+
+        $this->image->levelImage(0, $red, $quantumRange['quantumRangeLong'], Imagick::CHANNEL_RED);
+        $this->image->levelImage(0, $green, $quantumRange['quantumRangeLong'], Imagick::CHANNEL_GREEN);
+        $this->image->levelImage(0, $blue, $quantumRange['quantumRangeLong'], Imagick::CHANNEL_BLUE);
+
+        return $this;
+    }
+
     public function manualCrop(int $width, int $height, int $x = null, int $y = null): self
     {
         $cropped = new Size($width, $height);
@@ -262,4 +282,9 @@ public function focalCrop(int $width, int $height, $cropCenterX = null, $cropCen
 
         return $this;
     }
+
+    public function sepia(): ImageDriver
+    {
+        // TODO: Implement sepia() method.
+    }
 }

tests/Manipulations/ColorizeTest.php

@@ -0,0 +1,16 @@
+<?php
+
+use Spatie\Image\Drivers\ImageDriver;
+use Spatie\Image\Exceptions\InvalidManipulation;
+
+it('can blur an image', function (ImageDriver $driver) {
+    $targetFile = $this->tempDir->path("{$driver->driverName()}/blur.jpg");
+
+    $driver->load(getTestJpg())->colorize(10, 70, 10)->save($targetFile);
+
+    expect($targetFile)->toBeFile();
+})->with('drivers');
+
+it('will throw an exception when passing an invalid blur value', function (ImageDriver $driver) {
+    $driver->load(getTestJpg())->colorize(101, 100, 100);
+})->with('drivers')->throws(InvalidManipulation::class);