PHP ImageMagick - Enhancing & Equalizing

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Enhancing Images

Image enhancement is the process of improving the visual appearance or quality of an image. This can be achieved through a variety of techniques, such as adjusting brightness and contrast, color balancing, sharpening or blurring edges, changing resolution and noise removal.

There is a function provided by Imagemagick which is ‘enhanceImage()’. It takes the image as input and enhances the image by improving its quality and produces the enhanced image as output.

Syntax

public Imagick::enhanceImage(): bool

This function has no parameters.

Example

This example represents the PHP code to implement the function ‘enhanceImage()’. The new imagick is created at first, then ‘enhanceImage()’, function is applied and output is obtained in the format ‘enhanceImage.png’.

<?php
   $image=new Imagick($_SERVER['DOCUMENT_ROOT']."/test/image.jpeg");
   $image->enhanceImage();
   $image->writeImage($_SERVER['DOCUMENT_ROOT']."/test/enhanceImage.png");
?>

Assume that the following is the input image (image.jpg) in the program −

Output

Equalizing images

Equalizing images is a process of adjusting the contrast and brightness in an image to make it look more balanced. Equalizing can help bring out details in shadows and highlights, as well as improve color accuracy and reduce noise.

In this process, the contrast can either be increased or decreased based on the histogram equalization which is a computer image processing technique. In this section, you will be learning to equalize an image using the ‘equalizeImage()’ function provided by Imagemagick.

Syntax

public Imagick::equalizeImage(): bool

This function has no parameters. It takes an image as input and produces the equalized image as output.

Example

This example shows the implementation of ‘equalizeImage()’ function in PHP. The input image is read after creation of imagick object and then ‘equalizeImage()’ function is applied on that input image. The final output image is obtained in the format ‘equalizeImage.png’.

<?php
   $image=new Imagick($_SERVER['DOCUMENT_ROOT']."/test/image.jpeg");
   $image->equalizeImage();
   $image->writeImage($_SERVER['DOCUMENT_ROOT']."/test/equalizeImage.png");
?>

Assume that the following is the input image (image.jpeg) in the program −

Output