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Bug #59390 Opacity fails
Submitted: 2010-08-30 09:59 UTC Modified: 2010-08-30 12:24 UTC
From: junkboypaul at hotmail dot com Assigned:
Status: Not a bug Package: imagick (PECL)
PHP Version: 5.2.11 OS: Linux
Private report: No CVE-ID: None
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 [2010-08-30 09:59 UTC] junkboypaul at hotmail dot com 
Description:
------------
When using opacity, it seems to work ok, until I use roundCorners, once I do this, what should be transparent, goes black

Reproduce code:
---------------
<?php
	$im = new Imagick();
	$im->newImage(400,400,new ImagickPixel('green'), 'png');
	$im->roundCorners(50,50);
	$im->setImageOpacity(0.5);
	header('Content-Type: image/' . $im->getImageFormat());
	echo $im->getImageBlob();

Expected result:
----------------
Outside of the green section should be transparent

Actual result:
--------------
Outside of the green has gone black

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 [2010-08-30 12:23 UTC] mkoppanen@php.net 
Hi,

setImageOpacity _sets_ the opacity of the whole image. So in your case when you have fully opaque parts in the image setImageOpacity(0.5) changes those parts to 50% opaque.
 [2010-08-30 12:24 UTC] mkoppanen@php.net 
If you actually want to reduce opacity on whole image use:

$im->evaluateImage(Imagick::EVALUATE_DIVIDE, 2, Imagick::CHANNEL_ALPHA);
 
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