Tutorial on generating PSD file thumbnails with PHP

This article mainly introduces how to use PHP to generate PSD file thumbnails, mainly using imagick. This article explains how to install ImageMagick, install imagick, check whether the installation is successful, generate PSD file thumbnails, etc. I hope it will be helpful to everyone.

First step, install ImageMagick

First you need to install ImageMagick http://imagemagick.org/script/binary-releases.php#windows, because imagick is a A PHP extension that allows PHP to call ImageMagick functions. (The latest version is: ImageMagick-6.8.9-5-Q16-x64-dll.exe)

The installation directory cannot have spaces. I personally installed it in the root directory of drive C:

C:\ImageMagick

It can be installed by default all the way. After the installation is completed, open the CMD command line interface, enter: convert, and press Enter. If you can see a lot of content, the installation is successful.

If you are prompted " convert is not an internal or external command, operable program or batch file" or "Please enter the drive letter to convert" ( convert is a default system for converting FAT32 to NTFS command) then you need to add the ImageMagick installation path to the system path yourself.

　My Computer-> Right-click-> Properties-> Advanced-> Environment Variables-> System Variables-> Find "Path"-> Select and click to edit-> ; Add your installation path to it.

Second step, install imagick

Click here to download, please note that when downloading, you need to download the corresponding PHP version, and pay attention to whether the system is 32-bit or 64-bit, and Is PHP the NTS version or the TS version (the latest stable version is 3.1.2. Regarding how to determine whether PHP is the NTS version or the TS version, you can check the Thread Safety item through phpinfo. If it is enabled, it means it is the TS version, otherwise It is the NTS version)

Unzip the downloaded compressed package, find the php_imagick.dll file, put it in the PHP extension directory, then open the php.ini file and add the following line to the corresponding location:

extension=php_imagick.dll

Save and exit and restart the computer to ensure it takes effect.

The third step, check

If everything is normal, you should be able to see the imagick item in phpinfo after restarting, such as:

If it cannot be found, return to the first step, change to a different version of ImageMagick, reinstall and re-debug.

The fourth step, test

OK, at this step you can start writing code. I won’t go into details about the process, just go to the code

error_reporting(E_ERROR | E_WARNING);
 
$im = new Imagick('1.psd');
$im->setImageIndex(0);
$im->setIteratorIndex(0);
$im->stripImage(); //去除图片信息
$im->setImageCompressionQuality(80); //图片质量
$im->writeImage('1.jpg');

The above code has been tested and can correctly generate a 1.jpg picture.

It is recommended that the thumbnails be in jpg format, because the png format does not support compression. When I tested, I used a 30M PSD file. The generated png thumbnail was more than 3M, while the jpg was only about 200KB, and the generated The speed of png images is obviously very slow, taking about 3 or 4 seconds.

In addition, we did an extreme test and used a PSD file of nearly 600M to generate jpg thumbnails. The speed was basically within 2 seconds and the file size was less than 2.5M. Since the size of the image was not modified, Therefore, the size of the final generated file can be reduced according to the actual situation.

Step 5, other formats

In addition to PSD files, I also tried some other formats, such as MP4, AVI and other video formats, but the generation speed is super slow . Finally, I found that the more practical thing is to generate thumbnails of PDF files, but before processing PDF files, you need to install Ghostscript, and then the overall code is basically the same as the code to generate PSD

$im = new Imagick();
$im->readImage('D:/soft/wamp/www/test/1.pdf[0]');
//echo $im->getNumberImages();
$im->writeImages('D:/soft/wamp/www/test/1.jpg', false);

Related recommendations:

What is the GD library? Detailed introduction to loading GD library in PHP

(Advanced) PHP image processing technology-GD library

In-depth analysis of ImageMagick command execution vulnerability

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