Rotate Changes Transparency to Black

[jman]

I'm really sorry if this is a stupid mistake on my part but I swear I read about this and tried every combo of commands I could. First off....the command in shell and exec works perfectly....

Code: Select all

convert -verbose ".$input." -background none -rotate 45 ".$ouput

however attempting it with imagick with various versions of the following code produces a rotated image with the transparency turned black (see before/after images attached).

Code: Select all

$temp_user_image = new Imagick();
$temp_user_image->readImage(config::PUBLIC_HTML."sketch/sketchDefault3/maskBelly.png");
$temp_user_image->setBackgroundColor(new ImagickPixel('transparent'));
$temp_user_image->setImageAlphaChannel(imagick::ALPHACHANNEL_TRANSPARENT);
$temp_user_image->setImageMatte(1); 
$temp_user_image->rotateImage(new ImagickPixel('transparent'), 30);
$temp_user_image->setImageFormat("png32");  	
$temp_user_image->writeImage(config::PUBLIC_HTML."sketch/sketchDefault3/maskBelly2.png");

I'd really appreciate any help you could provide.

Versions:
ImageMagick 6.7.7-6 2012-06-07 Q16
PEAR Version: 1.9.4
PHP Version : 5.2.17
imagick: 3.0.1

[fmw42]

I am not an expert on Imagick, but try

$temp_user_image = new Imagick();
$temp_user_image->readImage(config::PUBLIC_HTML."sketch/sketchDefault3/maskBelly.png");
$temp_user_image->rotateImage(new ImagickPixel('none'), 30);
$temp_user_image->setImageFormat("png32");
$temp_user_image->writeImage(config::PUBLIC_HTML."sketch/sketchDefault3/maskBelly2.png");

[Bonzo]

This works OK for me - although needs triming and repaging.

Code: Select all

$im = new Imagick('before.png');
$im->rotateImage(new ImagickPixel('none'), 30); 
$im->writeImage('rotated.png'); 
$im->destroy();

There could be something wrong with your version; you could be confusing imagick with to much code?

I used Imagick API version 1608 on a linux server

[jman]

I tried both of your suggestions and both are producing the same situation...

If it matters I am running Centos 6.2 and pecl info imagick returns....

Code: Select all

ABOUT PECL.PHP.NET/IMAGICK-3.0.1
================================
Release Type          PECL-style PHP extension (source code)
Name                  imagick
Channel               pecl.php.net
Summary               Provides a wrapper to the ImageMagick library.
Description           Imagick is a native php extension to create and
                      modify images using the ImageMagick API.
                      This extension requires ImageMagick version
                      6.2.4+ and PHP 5.1.3+.

                      IMPORTANT: Version 2.x API is not compatible
                      with earlier versions.
Maintainers           Mikko Koppanen <mkoppanen@php.net> (lead)
                      Scott MacVicar <scottmac@php.net> (lead)
Release Date          2010-11-18 21:16:01
Release Version       3.0.1 (stable)
API Version           3.0.1 (stable)
License               PHP License (http://www.php.net/license)
Release Notes         - Fixed PECL bug #17244
Required Dependencies PHP version 5.1.3
                      PEAR installer version 1.4.0 or newer
package.xml version   2.0
Last Modified         2012-06-08 18:48
Previous Installed    - None -

[fmw42]

You are not running the latest version of Imagick. It is 3.1.x (but has not been upgraded in a while). Not sure where you can get it but try a google search. Or check with your ISP.

P.S.

see
http://pecl.php.net/package/imagick/3.1.0RC1

[magick]

See http://pecl.php.net/package/imagick/3.1.0RC2, updated 2012-05-30.

[jman]

I installed 3.1.0RC2, ran the image test with all above suggestions and my own code and still producing black background.

[Bonzo]

It is not something daft like the image was changed in some way when uploading it? Have you tried the image in this thread? Have you tried any other images?

[fmw42]

You are not using JPG for output are you? If so, it does not support transparency. Just checking.

[DJ Mike]

In your test you use:

$temp_user_image->setImageFormat("png32");

I used

$image->setimageformat("gif");

and didn't need to set BGcolor or alpha

Maybe try

$temp_user_image->setImageFormat("png");

Code: Select all

<?php
$image = new Imagick("opossum.jpg"); 
$image->rotateimage("transparent",30);
# make it a gif for transparency
$image->setimageformat("gif");
header("Content-type: image/gif");
echo $image;
?>

Imagick::rotateImage
http://eclecticdjs.com/mike/tutorials/p ... rotate.php