Grayscale

grayscale() removes colour while preserving luminance.

Example

Source	Grayscale

<?php

use Alto\Image\Image;

Image::open('source-landscape.png')
    ->grayscale()
    ->save('grayscale.png');

Options

No options.

Edge cases

• Dimensions and alpha do not change.

Driver support

GD and Imagick support grayscale() exactly.