PHP | Imagick contrastStretchImage() Function Last Updated : 31 Oct, 2019 Comments Improve Suggest changes Like Article Like Report The Imagick::contrastStretchImage() function is an inbuilt function in PHP which is used to enhance the contrast of the image. This function the enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available. Syntax: bool Imagick::contrastStretchImage( float $black_point, float $white_point, int $channel = Imagick::CHANNEL_DEFAULT) Parameters: This function accepts three parameters as mentioned above and described below: $black_point: This parameter holds the black point. $white_point: This parameter holds the white point. $channel: This parameter holds the Imagick channel constants that provide any channel constant which is valid for channel mode. More than one channel can be combined using bitwise operators. The default value of channel constant is CHANNEL_DEFAULT. Return Value: This function returns TRUE on success. Below programs illustrate the Imagick::contrastStretchImage() function in PHP: Program 1: php <?php // Create new Imagick object $imagick = new Imagick( 'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png'); // Apply the contrastStretchImage() function $imagick->contrastStretchImage(10, 20); header("Content-Type: image/png"); // Display the output image echo $imagick->getImageBlob(); ?> Output: Program 2: php <?php // Create new Imagick object $imagick = new Imagick( 'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png'); // Apply the contrastStretchImage() function $imagick->contrastStretchImage(100, 50); header("Content-Type: image/png"); // Display the output image echo $imagick->getImageBlob(); ?> Output: Program 3: php <?php // Create new Imagick object $imagick = new Imagick( 'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png'); // Apply the contrastStretchImage() function $imagick->contrastStretchImage(5000, 100); header("Content-Type: image/png"); // Display the output image echo $imagick->getImageBlob(); ?> Output: Reference: https://www.php.net/manual/en/imagick.contraststretchimage.php Comment More infoAdvertise with us Next Article Software Developer (SDE) Interview/Placement Preparation Guide gurrrung Follow Improve Article Tags : Web Technologies PHP PHP-function PHP-Imagick Similar Reads Interview Preparation Interview Preparation For Software Developers Must Coding Questions - Company-wise Must Do Coding Questions - Topic-wise Company-wise Practice Problems Company Preparation Competitive Programming Software Design-Patterns Company-wise Interview Experience Experienced - Interview Experiences Internship - Interview Experiences Practice @Geeksforgeeks Problem of the Day Topic-wise Practice Difficulty Level - School Difficulty Level - Basic Difficulty Level - Easy Difficulty Level - Medium Difficulty Level - Hard Leaderboard !! Explore More... Data Structures Arrays Linked List Stack Queue Binary Tree Binary Search Tree Heap Hashing Graph Advance Data Structures Matrix String All Data Structures Algorithms Analysis of Algorithms Searching Algorithms Sorting Algorithms Pattern Searching Geometric Algorithms Mathematical Algorithms Randomized Algorithms Greedy Algorithms Dynamic Programming Divide & Conquer Backtracking Branch & Bound All Algorithms Programming Languages C C++ Java Python C# Go Lang SQL PHP Scala Perl Kotlin Web Technologies HTML CSS JavaScript Bootstrap Tailwind CSS AngularJS ReactJS jQuery NodeJS PHP Web Design Web Browser File Formats Computer Science Subjects Operating Systems DBMS Computer Network Computer Organization & Architecture TOC Compiler Design Digital Elec. & Logic Design Software Engineering Engineering Mathematics Data Science & ML Complete Data Science Course Data Science Tutorial Machine Learning Tutorial Deep Learning Tutorial NLP Tutorial Machine Learning Projects Data Analysis Tutorial Tutorial Library Python Tutorial Django Tutorial Pandas Tutorial Kivy Tutorial Tkinter Tutorial OpenCV Tutorial Selenium Tutorial GATE CS GATE CS Notes Gate Corner Previous Year GATE Papers Last Minute Notes (LMNs) Important Topic For GATE CS GATE Course Previous Year Paper: CS exams Like