A imagecreatefrom* picture loading function
Pictures for different suffix names
Imagecreatefromgif
Imagecreatefromjpeg
Imagecreatefrompng
Imagecreatefromwbmp
Imagecreatefromstring
Use format: Imagecreatefromgif ("jjj.gif");
Two imagecopy picture merge function
Imagecopy (destimage,simage,int x,int y,int src_x,int src_y,int);
Destimage---original picture (large picture)
Simage---logo picture (small picture)
x---The coordinates of the original picture
Y---
src_x---The coordinates of the logo picture
Src_y---
Src_w---The width of the logo picture
Src_h---The height of the logo picture
Three imagecopyresized picture shearing function
Imagecopyresized (Resource Dst_image,resource src_image,int dst_x,int dst_y,int src_x,int src_y,int dst_w,int dst_h,int Src_w,int src_h);
Dst_image---original true color pictures
Src_image---original picture
Dst_x---From what position is generally 0
Dst_y---is generally 0
Src_x---from where to start shearing is generally 0
Src_y---is generally 0
Dst_w---The width and height of a new picture
Dst_h---
Src_w---The width and height of the original picture
Src_h---
Examples:
image.php
Copy Code code as follows:
<?php
/*
* This PHP file to achieve image watermark and generate thumbnail function
*
*/
This does not write the upload function, first puts the picture to the project root directory
Importing and parsing pictures
$image = "Img.jpg";
$img =getimagesize ($image);
To determine the suffix name of a picture
Switch ($img [2]) {
Case 1:
$im =imagecreatefromgif ($image);
Break
Case 2:
$im =imagecreatefromjpeg ($image);
Break
Case 3:
$im =imagecreatefrompng ($image);
Break
}
Parse picture
$logo = "Pic.jpg";
$pic =getimagesize ($logo);
Switch ($pic [2]) {
Case 1:
$im _pic=imagecreatefromgif ($logo);
Break
Case 2:
$im _pic=imagecreatefromjpeg ($logo);
Break
Case 3:
$im _pic=imagecreatefrompng ($logo);
Break
}
Picture synthesis, also make watermark
Imagecopy ($im, $im _pic,0,500,0,0,100,75);
Set color
$FC =imagecolorallocate ($im, 255,255,255);
First, convert the text to UTF-8 format
$str =iconv ("gb2312", "Utf-8", "Ah-ha");
Add Chinese watermark
Imagettftext ($im, 12,0,20,20, $FC, "Simkai.ttf", "my qq:260954520");
Build a original true color picture
$new _img=imagecreatetruecolor (50,40);
Cut pictures
Imagecopyresized ($new _img, $im, 0,0,0,0,50,40, $img [0], $img [1]);
Output picture
Header ("Content-type:image/jpeg");
Cut the small figure, can be like the following one to generate a small figure with a judgment
Imagejpeg ($new _img);
Create a picture with a watermark
/*
if (imagejpeg ($im, "new picture. jpg")) {
echo "watermark Success";
}
*/
?>
