Add ColorizeModifiers

src/Drivers/Abstract/AbstractImage.php

@@ -138,6 +138,13 @@ public function gamma(float $gamma): ImageInterface
         );
     }
 
+    public function colorize(int $red = 0, int $green = 0, int $blue = 0): ImageInterface
+    {
+        return $this->modify(
+            $this->resolveDriverClass('Modifiers\ColorizeModifier', $red, $green, $blue)
+        );
+    }
+
     public function blur(int $amount = 5): ImageInterface
     {
         return $this->modify(

src/Drivers/Gd/Modifiers/ColorizeModifier.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Intervention\Image\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+class ColorizeModifier implements ModifierInterface
+{
+    public function __construct(
+        protected int $red = 0,
+        protected int $green = 0,
+        protected int $blue = 0
+    ) {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        // normalize colorize levels
+        $red = round($this->red * 2.55);
+        $green = round($this->green * 2.55);
+        $blue = round($this->blue * 2.55);
+
+        foreach ($image as $frame) {
+            imagefilter($frame->core(), IMG_FILTER_COLORIZE, $red, $green, $blue);
+        }
+
+        return $image;
+    }
+}

src/Drivers/Imagick/Modifiers/ColorizeModifier.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Intervention\Image\Drivers\Imagick\Modifiers;
+
+use Imagick;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+class ColorizeModifier implements ModifierInterface
+{
+    public function __construct(
+        protected int $red = 0,
+        protected int $green = 0,
+        protected int $blue = 0
+    ) {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        // normalize colorize levels
+        $red = $this->normalizeLevel($this->red);
+        $green = $this->normalizeLevel($this->green);
+        $blue = $this->normalizeLevel($this->blue);
+
+        foreach ($image as $frame) {
+            $qrange = $frame->core()->getQuantumRange();
+            $frame->core()->levelImage(0, $red, $qrange['quantumRangeLong'], Imagick::CHANNEL_RED);
+            $frame->core()->levelImage(0, $green, $qrange['quantumRangeLong'], Imagick::CHANNEL_GREEN);
+            $frame->core()->levelImage(0, $blue, $qrange['quantumRangeLong'], Imagick::CHANNEL_BLUE);
+        }
+
+        return $image;
+    }
+
+    private function normalizeLevel(int $level): int
+    {
+        return $level > 0 ? $level / 5 : ($level + 100) / 100;
+    }
+}

src/Interfaces/ImageInterface.php

@@ -218,6 +218,46 @@ public function text(string $text, int $x, int $y, ?callable $init = null): Imag
      */
     public function greyscale(): ImageInterface;
 
+    /**
+     * Invert the colors of the current image
+     *
+     * @return ImageInterface
+     */
+    public function invert(): ImageInterface;
+
+    /**
+     * Adjust brightness of the current image
+     *
+     * @param  int $level
+     * @return ImageInterface
+     */
+    public function brightness(int $level): ImageInterface;
+
+    /**
+     * Adjust contrast of the current image
+     *
+     * @param  int $level
+     * @return ImageInterface
+     */
+    public function contrast(int $level): ImageInterface;
+
+    /**
+     * Apply gamma correction on the current image
+     *
+     * @param  float $gamma
+     * @return ImageInterface
+     */
+    public function gamma(float $gamma): ImageInterface;
+
+    /**
+     * Adjust the intensity of the RGB color channels
+     *
+     * @param  int $red
+     * @param  int $green
+     * @param  int $blue
+     * @return ImageInterface
+     */
+    public function colorize(int $red = 0, int $green = 0, int $blue = 0): ImageInterface;
 
     /**
      * Blur current image by given strength

tests/Drivers/Gd/Modifiers/ColorizeModifierTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Drivers\Gd\Modifiers\ColorizeModifier;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateGdTestImage;
+
+/**
+ * @requires extension gd
+ * @covers \Intervention\Image\Drivers\Gd\Modifiers\ColorizeModifier
+ */
+class ColorizeModifierTest extends TestCase
+{
+    use CanCreateGdTestImage;
+
+    public function testModify(): void
+    {
+        $image = $this->createTestImage('tile.png');
+        $image = $image->modify(new ColorizeModifier(100, -100, -100));
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(5, 5));
+        $this->assertColor(255, 0, 0, 255, $image->pickColor(15, 15));
+    }
+}

tests/Drivers/Imagick/Modifiers/ColorizeModifierTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Imagick\Modifiers;
+
+use Intervention\Image\Drivers\Imagick\Modifiers\ColorizeModifier;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateImagickTestImage;
+
+/**
+ * @requires extension gd
+ * @covers \Intervention\Image\Drivers\Imagick\Modifiers\ColorizeModifier
+ */
+class ColorizeModifierTest extends TestCase
+{
+    use CanCreateImagickTestImage;
+
+    public function testModify(): void
+    {
+        $image = $this->createTestImage('tile.png');
+        $image = $image->modify(new ColorizeModifier(100, -100, -100));
+        $this->assertColor(251, 0, 0, 255, $image->pickColor(5, 5));
+        $this->assertColor(239, 0, 0, 255, $image->pickColor(15, 15));
+    }
+}