Open an Gif/Png and change it with PHP4

[Anon]

Hi folks!

I have played around with some functions to make lines and rectangles in an png... I used this to create the png:

Header("Content-type: image/png");
$im = imagecreate(385,150);
ImagePng($im);

But how can I open an existing PNG...for example I want to open a map-grafic to draw some dots in it...?!

Any help?!

[Anon]

Use ImageCreateFromPNG or ImageCreateFromJPEG, which are part of PHP3 >= 3.0.13, PHP4 >= 4.0b4.

See the "Image functions" section of the online manual.