creating image!

[ibo]

i wrote down the script below to make a simple image;

<?
header("Content-type: image/png");
$sim=imagecreate(400,200);
imagepng($sim);
imagedestroy($sim);
?>

it looks like working it does not give any error message but when it runs it says downloading picture and stucks. No picture is shown though you wait so much. Whats the problem?

[daveyboy]

you might want to try doing something to the picture first - at least run ImageColorAllocate once to give the graphic some colour. You are creating an image, but not creating it, if you see what I mean. Kind of like opening the CD-ROM drawer, but not putting the CD in.
Try this:

header( 'Content-type: image/png');
$image  = ImageCreate( 10, 10 );
$colour1 = ImageColorAllocate( $image, 0, 0, 0 );
ImagePng( $image );
ImageDestroy( $image );

You should get a 10x10 black square.

[ibo]

daveyboy thanks for your advice,

if i use .png format for the picture it works only if i run imagecolorallocate first, but if i use .jpeg format it works itself without needing imagecolorallocate, i did not understand why!

Secondly, getimagesize() does not work! here is the code;

<?
header("content-type: image/png");
$img=imagecreate(400,200);
$inf=getimagesize("img.png");
echo $inf[0];
?>

it says,

<b>Warning</b>: getimagesize: Unable to open 'img.png' for reading.

[daveyboy]

it sounds like 'img.png' doesn't exist. i hope you don't think $img and 'img.png' are the same thing?