CODEWITHSUNDEEP
phppngjpegimagick
rabudde
rabudde

Reputation: 7722

php imagick convert PNG to jpg

$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');

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');

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).

Upvotes: 14

Views: 37362

Answers (4)

Bastien
Bastien

Reputation: 119

Another way to convert transparent png to jpg, as mentioned in Imagick::flattenImages:

$im = new Imagick('image.png');
$im->setImageBackgroundColor('white');

$im->flattenImages(); // This does not do anything.
$im = $im->flattenImages(); // Use this instead.

$im->setImageFormat('jpg');
$im->writeImage('image.jpg');

As time moves on, flattenImages() has been deprecated.
Instead of the line above use: 

$im->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);

Upvotes: 11

rabudde
rabudde

Reputation: 7722

Found a solution:

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

Upvotes: 26

Sander Marechal
Sander Marechal

Reputation: 23216

You can use setBackgroundColor to set the default background color to something else than black. The PNG transparency will be replaced by the background color when saving to JPG.

Edit: Use it like so:

$img->setBackgroundColor(new ImagickPixel('#FFFFFF'));

Upvotes: 2

binaryLV
binaryLV

Reputation: 9122

Try adding $image->setBackgroundColor(0xFFFFFF); after $image = new Imagick('PNG:image.tmp');

Upvotes: 0

Related Questions