Brightness, Contrast & Colors

Changing the Brightness

public Image::brightness(int $level): ImageInterface

Change the brightness of the current image by a given level. Use values between -100 for min. brightness 0 for no change and +100 for max. brightness.

Parameters

Name Type Description
level integer Level of brightness change

Examples

use Intervention\Image\ImageManager;
use Intervention\Image\Drivers\Imagick\Driver;

// create new manager instance with desired driver
$manager = new ImageManager(new Driver());

// reading an image
$image = $manager->read('images/example.png');

// increase brightness
$image = $image->brightness(35);

Changing the Contrast

public Image::contrast(int $level): ImageInterface

Change the contrast of the current image by a given level. Use values between -100 for min. contrast 0 for no change and +100 for max. contrast.

Parameters

Name Type Description
level integer Level of contrast change

Examples

use Intervention\Image\ImageManager;
use Intervention\Image\Drivers\Gd\Driver;

// create new manager instance with desired driver
$manager = new ImageManager(Driver::class);

// reading an image
$image = $manager->read('images/example.png');

// decreasing the contrast
$image = $image->contrast(-10);

Gamma Correction

public Image::gamma(float $gamma): ImageInterface

Apply a gamma correction operation on the current image.

Parameters

Name Type Description
gamma float Gamma compensation value

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::gd();

// reading an image
$image = $manager->read('images/example.jpg');

// apply gamma correction
$image = $image->gamma(1.7);

Color Correction

public Image::colorize(int $red = 0, int $green = 0, int $blue = 0): ImageInterface

Change the intensity level of the given color values of red, green and blue. The input values are normalized so you have to include parameters from 100 for maximum color intesity to 0 for no change and -100 to remove all the certain color on the image.

Parameters

Name Type Description
red int Intesity correction of all red colors in image
green int Intesity correction of all green colors in image
blue int Intesity correction of all blue colors in image

Examples

use Intervention\Image\ImageManager;
use Intervention\Image\Drivers\Gd\Driver;

// create new manager instance with desired driver
$manager = ImageManager::withDriver(Driver::class);

// reading an image
$image = $manager->read('images/example.jpg');

// change colors to a blue & green tone
$image = $image->gamma(blue: 15, green: 10);

Convert image to a greyscale version

public Image::greyscale(): ImageInterface

Converts the current image into a greyscale version.

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::imagick();

// read a colored image
$image = $manager->read('images/example.jpg');

// turn image into a greyscale version
$image = $image->greyscale();

Various Effects

Mirror Image Horizontally

public Image::flop(): ImageInterface

Mirror the current image horizontally.

Examples

use Intervention\Image\ImageManager;
use Intervention\Image\Drivers\Imagick\Driver;

// create new manager instance with desired driver
$manager = new ImageManager(new Driver());

// reading an image
$image = $manager->read('images/example.png');

// mirror image
$image = $image->flop();

Mirror Image Vertically

public Image::flip(): ImageInterface

Mirror the current image vertically.

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::imagick();

// reading an image
$image = $manager->read('images/example.png');

// flood fill image with color
$image = $image->flip();

Image Rotation

public Image::rotate(float $angle, mixed $background = 'ffffff'): ImageInterface

Rotates the current image counterclockwise by the specified angle. Optionally, specify a background color to fill the newly created uncovered areas after the rotation.

Parameters

Name Type Description
angle float The rotation angle in degrees to rotate the image counterclockwise
background mixed A color to fill the newly created areas after rotation

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::gd();

// reading an image
$image = $manager->read('images/example.png');

// rotate image 45 degrees clockwise 
$image = $image->rotate(-45);

Blur Effect

public Image::blur(int $amount = 5): ImageInterface

Apply a gaussian blur effect on the current image. Use the optional amount argument to define the effect strenght with values between 0 and 100.

With GD driver this method is performance intensive on larger amounts of blur. Use with care.

Parameters

Name Type Description
amount integer Effect strength value (0 - 100)

Examples

use Intervention\Image\ImageManager;
use Intervention\Image\Drivers\Gd\Driver;

// create new manager instance with desired driver
$manager = new ImageManager(Driver::class);

// reading an image
$image = $manager->read('images/example.png');

// apply blurring effect
$image = $image->blur(3);

Sharpening Effect

public Image::sharpen(int $amount = 10): ImageInterface

Sharpen the current image instance with an optional amount.

Parameters

Name Type Description
amount integer The amount of the sharpening strength. (0 - 100)

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::imagick();

// reading an image
$image = $manager->read('images/example.png');

// apply blurring effect
$image = $image->blur(3);

Invert Colors

public Image::invert(): ImageInterface

Invert all colors of the current image.

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::gd();

// reading an image
$image = $manager->read('images/example.png');

// invert colors
$image = $image->invert();

Pixelation Effect

public Image::pixelate(int $size): ImageInterface

Applies a pixelation effect on the current image with a given pixel size.

Parameters

Name Type Description
size integer Size of the pixels.

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::withDriver(new Driver());

// reading an image
$image = $manager->read('images/example.png');

// apply the pixelation effect
$image = $image->pixelate(12);

Reduce Colors

public Image::reduceColors(int $limit, mixed $background = 'transparent'): ImageInterface

Apply color quantization to the current image by reducing the numbers of distinct colors in the current image to the given limit. The number of colors is lowered in a way that the new image should be as visually similar as possible.

With GD driver (semi-)transparent colors that lose their transparency as a result of the reduction process are blended against the given background color.

Parameters

Name Type Description
limit integer Allowed number of distinct colors
mixed background Color formerly semi-transparent colors are blended against

Examples

use Intervention\Image\ImageManager;

// create new manager instance with desired driver
$manager = ImageManager::imagick();

// reading an image
$image = $manager->read('images/example.png');

// quantize colors to a maximum of 16
$image = $image->reduceColors(16);
Edit