Home Backend Development PHP Tutorial Improve PHP drawing effects: eliminate image blur problems

Improve PHP drawing effects: eliminate image blur problems

Feb 27, 2024 pm 05:39 PM
php Drawing Remove blur

Improve PHP drawing effects: eliminate image blur problems

Improve PHP drawing effect: eliminate image blur problem, need specific code examples

In web development, PHP is often used to process images, such as generating verification codes, Crop pictures, add watermarks, and more. However, sometimes we find that the generated images have blur problems, which affects the visual effect. This article will introduce some methods to eliminate image blur problems during PHP drawing and provide specific code examples.

1. Use the GD library

The GD library is an extension library used to process images in PHP and provides a wealth of functions to operate images. To eliminate the image blur problem, you first need to ensure that the GD library has been installed on the server. Open the GD library in php.ini, search for extension=gd, and delete the preceding comment symbol ";". Then restart the server to ensure that the GD library has taken effect.

2. Adjust image quality

In PHP, the quality of the image can be set when generating the image. By adjusting the quality parameters, the image blur problem can be effectively eliminated. When using imagepng, imagejpeg and other functions to generate images, you can pass in the third parameter as the quality parameter, with a value ranging from 0 to 100, where 0 represents the worst quality and 100 represents the highest quality. It is generally recommended to set the quality parameter above 80 to ensure image clarity.

// 生成JPEG图像
$image = imagecreatefromjpeg('input.jpg');
imagejpeg($image, 'output.jpg', 90); // 质量参数设置为90

// 生成PNG图像
$image = imagecreatefrompng('input.png');
imagepng($image, 'output.png', 9); // 质量参数设置为9
Copy after login

3. Avoid repeated compression

When processing images in PHP, avoid compressing the same image multiple times, because each compression will lose a certain amount of image quality and lead to blurring. If you need to process the image multiple times, it is recommended to save the original image in a temporary file and use the original image for each processing.

4. Adjust the image size

Sometimes the image blur problem may also be caused by the size of the image display not matching the size of the original image. When using functions such as imagecopyresampled to draw an image, you can adjust the size of the target image to ensure that it is consistent with the proportion of the original image, thereby avoiding blur problems caused by image stretching or compression.

// 调整图像大小
$width = imagesx($image);
$height = imagesy($image);
$newWidth = 500;
$newHeight = $height * ($newWidth / $width);
$newImage = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
Copy after login

5. Choose the correct image format

Different image formats have different effects on image quality. Generally speaking, JPEG is a lossy compression format that is suitable for complex images such as photos, but may result in blurry details. PNG is a lossless format suitable for simple images such as icons and lines, and can retain more details. Choosing the appropriate image format according to actual needs will help improve image quality.

Through the above methods, we can effectively eliminate image blur problems in the PHP drawing process, improve image quality, and make the generated images clearer and more delicate. Hope the above content is helpful to you!

The above is the detailed content of Improve PHP drawing effects: eliminate image blur problems. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

See all articles