imagecolorallocatealpha ?

stephen2002

When I run this simple code:

$thumbimage = imagecreatetruecolor(200, 150);
imagealphablending($thumbimage,true);

$black = imagecolorallocate($thumbimage, 0, 0, 0); //black
$white = imagecolorallocatealpha($thumbimage,255,255,255); //white

I get this error:

[Fri Feb 07 19:36:35 2003] [error] PHP Fatal error: Call to undefined function: imagecolorallocatealpha() in functest2.php on line 9

I have some lines of code above that, so the line numbers don't match. I am using PHP4.3.0 (windows binary on Apache 1.3.x) Is there any other way to use transparency effects than using imagecolorallocatealpha? Apparently it dosn't exist even though it is both in the PHP and GD documentation!😕

acidbox

Im not a big GD library fan. The other alternative, which I like better, is ImageMagick.

Check it out, they have a TON of functions.

An easy way to execute them when you install it, is by using the exec() function. You can run a program just like you were running it from a linux command line.

stephen2002

the link is broken.

Is the function that I am trying to use a function or not? Does anybody else have experience with it?

acidbox

hrm.... try this: http://www.php.net/manual/en/function.imagecolortransparent.php

bobthedog

Originally posted by stephen2002
I get this error:

[Fri Feb 07 19:36:35 2003] [error] PHP Fatal error: Call to undefined function: imagecolorallocatealpha() in functest2.php on line 9

I have some lines of code above that, so the line numbers don't match. I am using PHP4.3.0 (windows binary on Apache 1.3.x) Is there any other way to use transparency effects than using imagecolorallocatealpha? Apparently it dosn't exist even though it is both in the PHP and GD documentation!😕

But - taking a look at the big block of text on php.net, below the function name reads...

(no version information, might be only in CVS)

I would suggest taking a look at the other gd funcs regarding transparency such as...

[man]imagecolorclosestalpha/man
[man]imagecolorexactalpha/man
[man]imagecolorresolvealpha/man
[man]imagecolortransparent/man

Hopefully these should be able to do what you want 🙂 Good luck

stephen2002

yes, I saw that line and figured that was probably the source of the issues.

However, the other functions only act on existing transparent colors and there are none in the image that I am creating from scratch. And imagecolortransparent() sets a specific color in the image to be transparent (as if you were creating a GIF). However, I wanted to draw a box that was semi-transparent and the unerlying image would show through with the alpha blending.

tashbee

Did you have any luck with this problem, I am trying to acheive exactly the same and having the same problem.

If you do have an answer that would be great as I am starting to think about imagemagick

Kind Regards

Thomas Ashbee

stephen2002

nope, I gave up and just went with an intermediate result for now. I am still looking. 🙁