PHP imagick gif to jpg - background

Question

I've this gif:

https://dl.dropboxusercontent.com/u/76885657/stackoverflow/2.gif

(transparent background)

And with this code:

$im = new Imagick();    
$im->readimage("example.gif");     
$im->setImageAlphaChannel(11);    
$im->setImageBackgroundColor('white');    
$im->setImageFormat("jpg");    
$im->stripImage();    
$im->writeImage("example.jpg");    
$im->clear();    
$im->destroy();

Results:

https*://dl.dropboxusercontent.com/u/76885657/stackoverflow/3.jpg(without *)

(gold background)

But want this:

https://dl.dropboxusercontent.com/u/76885657/stackoverflow/2.jpg

(white background)

Ok, just to clarify... You want to rename your rendered jpg as `2.jpg`, is that? — Dimas Pante, Jan 26 '15 at 16:29
Take a look here: http://stackoverflow.com/questions/6610739/php-imagick-convert-png-to-jpg — Dimas Pante, Jan 26 '15 at 16:36
Trying only $im->setBackgroundColor('white') results the same, The link is for png... in gif doesn't work. With $im->setImageAlphaChannel(11); only, returns black — lucasgabmoreno, Jan 26 '15 at 16:40

lucasgabmoreno · Accepted Answer · 2015-01-30T19:08:16.263

1

I've found it. Was the order!:

$im = new Imagick();    
$im->readimage("example.gif");

// Wrong

$im->setImageBackgroundColor('white');  
$im->setImageAlphaChannel(11);

// Write!!!

$im->setImageAlphaChannel(11);    
$im->setImageBackgroundColor('white');

// Rest of code...

$im->setImageFormat("jpg");    
$im->stripImage();    
$im->writeImage("example.jpg");    
$im->clear();    
$im->destroy();

edited Jan 30 '15 at 19:08

answered Jan 26 '15 at 17:35

lucasgabmoreno

1,001
1
10
18

Could you explain why you used `11` instead of [Imagick constants](http://php.net/manual/en/imagick.constants.php#imagick.constants.alphachannel)? And especially, what does 11 mean? – aross Mar 26 '15 at 09:02
I used 11 instead of constants because is a channel, not a color. 11 is the number of channel to change. – lucasgabmoreno Mar 26 '15 at 11:27
I'm not sure I understand... there are constants like `Imagick::ALPHACHANNEL_SET`. – aross Mar 26 '15 at 12:34
1

Actually I believe 11 is the value of `Imagick::ALPHACHANNEL_REMOVE`, see: http://php.net/manual/en/imagick.flattenimages.php#116956 – aross Mar 26 '15 at 17:29
You are right, maybe 11 is the number of the constant used in the imagick class to reduce the class code. I don't really know – lucasgabmoreno Mar 26 '15 at 17:56

PHP imagick gif to jpg - background

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