php imagick将PNG转换为jpg [英] php imagick convert PNG to jpg

问题描述

$image = "[...]"; //binary string containing PNG image
$file = fopen('image.tmp', 'wb');
fputs($file, $image);
fclose($file);
$image = new Imagick('PNG:image.tmp');
$image->thumbnailImage($width, $height);
$image->setImageFormat('jpg');
$image->setCompressionQuality(97);
$image->writeImage('image.jpg');

以上操作无效，并给我

The above doesn't work and gives me a black image for this image. When doing instead

[...]
$image->setImageFormat('png');
$image->setCompressionQuality(97);
$image->writeImage('image.png');

一切都很好.我认为它必须在透明背景下做某事，而该背景在JPG格式中不可用.任何人都可以帮助解决此问题(imagick的文档记录非常不好，所以我不知道该如何帮助自己).

all is fine again. I think it has to do something with transparent background, which isn't available in JPG format. Can anyone help to solve this (imagick isn't documented very well, so I don't know how to help myself).

推荐答案

找到了解决方案:

$white=new Imagick();
$white->newImage($width, $height, "white");
$white->compositeimage($image, Imagick::COMPOSITE_OVER, 0, 0);
$white->setImageFormat('jpg');
$white->writeImage('image.jpg');

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