使用PHP通过压缩将PNG转换为JPG? [英] Use PHP to convert PNG to JPG with compression?

问题描述

我有一堆高质量的PNG文件.我想使用PHP将它们转换为JPG，因为它在保持质量的同时较小的文件大小.我想在网上显示JPG文件.

I have a bunch of high quality PNG files. I want to use PHP to convert them to JPG because of it's smaller file sizes while maintaining quality. I want to display the JPG files on the web.

PHP是否具有执行此功能的函数/库?质量/压缩效果好吗?

Does PHP have functions/libraries to do this? Is the quality/compression any good?

推荐答案

执行此操作可将PNG安全地转换为具有白色透明性的JPG.

Do this to convert safely a PNG to JPG with the transparency in white.

$image = imagecreatefrompng($filePath);
$bg = imagecreatetruecolor(imagesx($image), imagesy($image));
imagefill($bg, 0, 0, imagecolorallocate($bg, 255, 255, 255));
imagealphablending($bg, TRUE);
imagecopy($bg, $image, 0, 0, 0, 0, imagesx($image), imagesy($image));
imagedestroy($image);
$quality = 50; // 0 = worst / smaller file, 100 = better / bigger file 
imagejpeg($bg, $filePath . ".jpg", $quality);
imagedestroy($bg);

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