If you use
int imagecreatefromgif (string filename);
To take out a GIF format graphic, draw a graphic on it when the background or basic canvas sample is used, and note that:
If there is no pigment in this file, you will not be able to use it.
Workaround, you can use
int imagecreate (int x_size, int y_size);
Create an all-empty graphic. Draw a graphic on it. Use black as a transparent color.
This new shape will be the same size as the original, the absolute position is the same, put it above the original graph, it is possible.
Original graphics file
Full empty file photo.php
Photo.php's Code:
Header ("Content-type:image/gif");
$im = Imagecreate (200,300);
$black = Imagecolorallocate ($im, 0,0,0);
$red = Imagecolorallocate ($im, 255,0,0);
$blue = Imagecolorallocate ($im, 0,0,255);
Imagerectangle ($im, 100,200,150,200, $red);
Imagestring ($im, 2,120,150, "aaaaaaaa", $blue);
Imagecolortransparent ($im, $black);
Use black as a transparent color
Imagegif ($im);
Imagedestroy ($im);
?>
The above describes the dynamic generation of GIF format image considerations, including the dynamic production of GIF content, I hope that the PHP tutorial interested in a friend to help.
