Transparency Help

[ivoilic]

So I wanted to preserve the transparency on a circle shaped .png file.  I figured the best way to do this was to fill the background in with some particular color and then use imagecolortransparent() to hide the color.  Using code found here:http://www.php.net/manual/en/function.imagecolortransparent.php I tried to do just this.  I kept getting errors and so to isolate the problem I made a new file and copied the original code:

<?php
// Create a 55x30 image
$im = imagecreatetruecolor(55, 30);
$red = imagecolorallocate($im, 255, 0, 0);
$black = imagecolorallocate($im, 0, 0, 0);

// Make the background transparent
imagecolortransparent($im, $black);

// Draw a red rectangle
imagefilledrectangle($im, 4, 4, 50, 25, $red);

// Save the image
imagepng($im, './imagecolortransparent.png');
imagedestroy($im);
?>

This still didn't work :

Warning: imagepng() [function.imagepng]: Unable to open './imagecolortransparent.png' for writing: Permission denied in /Library/WebServer/Documents/temp/test.php on line 21

So I deleted './imagecolortransparent.png' and got: �PNG IHDR7�tRNSn��AIDATX���1 �����l�.B�Er[�DH���⦞�^r��x���%�K��/9^r�����U,ҟ� IEND�B`�

IDK what to do, can someone explain what is wrong or what other method I can use to preserve the transparency of the .png?

 

[jcbones]

Warning: imagepng() [function.imagepng]: Unable to open './imagecolortransparent.png' for writing: Permission denied in /Library/WebServer/Documents/temp/test.php on line 21

 

The bolded text tells us that the permissions on that file are not set to allow the server to write to it.  You will have to change the permissions on the file to allow it to work.  I would start with 644.

[ivoilic]

Can you please explain in more detail, I'm a bit of a noob...

[jcbones]

Well, file permissions are an important part of servers, as they restrict who can do what with a file (as you have just found out).  Being that I am inherently lazy, I'm going to ask that you look here, and if you encounter more questions or get massively confused (it happens), I'll see if I could help.  My communications skills have been lacking lately, and I would probably confuse you more than those links, ATM.

[ivoilic]

Thank you for the link, I now understand what you meant by 644.  However I still don't know how to change the permissions since I am using apache server to test out my files locally.