[PHP-NOTES] note 130530 added to imagick.setimagecompression

Note that the behaviour of this function seems to have changed since extension version 3.6.0 which updated the imagemagick version which this is compiled against from 7.0.7-11 to 7.1.0-13.

Previously, you could do the following:

<?php

$im = new Imagick();
$im->readImage('rose:');
$im->setImageCompression(Imagick::COMPRESSION_LZW);
$im->writeImage('rose_compressed_lzw.tiff');

?>

And you would get a compressed TIFF.

Now, you have to use:

<?php

$im = new Imagick();
$im->readImage('rose:');
$im->setCompression(Imagick::COMPRESSION_LZW);
$im->writeImage('rose_compressed_lzw.tiff');

?>

As such, I'm not 100% sure what the setImageCompression actually does anymore.
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