Comments on: Smart Image Resizing while Preserving Transparency With PHP and GD Library

By: David

David — Mon, 23 Jan 2012 02:20:38 +0000

Are you getting black background? I was getting it for like 3 hours before I found solution. I had this problem just with some images. Some were good, some had black background. I tried to dump $trnprt_indx variable with these bad images and I was getting values less than zero! Condition if ($trnprt_indx >= 0) is meaningless. Note: I was dealing just with PNGs. Don’t know if it affects GIFs.

By: Maniya

Maniya — Wed, 11 Jan 2012 02:29:38 +0000

Great work.. Thanks for your code.. it saved my time… :)

By: Pies

Pies — Mon, 14 Nov 2011 14:43:09 +0000

Very cool, thank you so much!

There’s a typo in the code on github, instead of:


    $transparent_color  = imagecolorsforindex($image, $trnprt_indx);

    $transparency       = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);

it should be:


    $transparent_color  = imagecolorsforindex($image, $transparency);

    $transparency       = imagecolorallocate($image_resized, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);

Thanks anyway :)

By: Michael L Watson

Michael L Watson — Mon, 07 Nov 2011 22:39:08 +0000

Nice work, thanks a lot!

By: Mehul Batliwala

Mehul Batliwala — Tue, 27 Sep 2011 09:26:35 +0000

Very good work. Thank you. :)

By: Toxicroadkill

Toxicroadkill — Mon, 19 Sep 2011 22:30:02 +0000

GREAT!!

By: GDライブラリで透過形式の画像をリサイズするのに便利な関数 « redcocker's notebook

GDライブラリで透過形式の画像をリサイズするのに便利な関数 « redcocker's notebook — Sat, 10 Sep 2011 16:58:53 +0000

[...] Smart Image Resizing while Preserving Transparency With PHP and GD Library [...]

By: logan

logan — Tue, 16 Aug 2011 17:23:49 +0000

hearty thanks for you…

By: Mark

Mark — Thu, 07 Apr 2011 04:06:52 +0000

You saved the day sir! thank you so much for posting this online! You’re the only person who has posted a script that actually works on PNGs with full opacity.

By: Richy

Richy — Thu, 10 Mar 2011 08:51:10 +0000

Class doesn't work on my server. I get the following error message:

Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /home/vhosts/mysite.nl/httpdocs/096/SmartImage.class.php on line 16