PHP Image processing (zoom, trim, zoom, flip, rotate, transparent, sharpen)

Note: If you want to use PHP GD processing we need to open the GD library

GD Library support for PHP under Windows

Find php.ini, open content, find:

; Extension=php_gd2.dll

Put the front semicolon ";" Remove, then save, if there is no semicolon, that is already open.

Linux opens GD Library

# #检测GD库是否安装命令
php5-m | Grep-i GD
Or
Php-i | Grep-i--color GD
# #如未安装GD库, the server is installed by the following method
### if is the source code installs, then adds the parameter
--with-gd
### if the Linux system in the Debian Department is installed with Apt-get, the following
Apt-get Install PHP5-GD
### if it is a centos system, install it with Yum, as follows
Yum Install PHP-GD
### if it's a SUSE Linux system, install it with YaST, as follows
Yast-i PHP5_GD

First, create picture resources

Imagecreatetruecolor (Width,height);

Imagecreatefromgif (picture name);

Imagecreatefrompng (picture name);

Imagecreatefromjpeg (picture name);

Draw a variety of images

Imagegif (picture resources, save path);

Imagepng ()

Imagejpeg ();

Second, get picture properties

Imagesx (res//width

Imagesy (res//height

getimagesize (file path)

Returns an array of four cells. Index 0 contains the pixel value of the image width, and index 1 contains the pixel value of the image height. Index 2 is the tag of the image type: 1 = gif,2 = jpg,3 = png,4 = swf,5 = psd,6 = bmp,7 = TIFF (Intel byte order), 8 = TIFF (Motorola byte order), 9 = jpc,10 = jp2,11 = jpx,12 = jb2,13 = swc,14 = iff,15 = wbmp,16 = XBM. These tags correspond to the newly added imagetype constants of PHP 4.3.0. Index 3 is a text string with the contents "height=" yyy "width=" xxx, which can be used directly for the IMG tag. Destroying image Resources

Imagedestroy (picture resources);

Third, transparent processing

PNG, JPEG transparent colors are normal, only gif is not normal

Imagecolortransparent (resource image [, int color])//Set a color to a transparent color

Imagecolorstotal ()

Imagecolorforindex ();

Four, the picture cutting

Imagecopyresized ()

Imagecopyresampled ();

Five, add watermark (text, picture)

String encoding conversion string Iconv (String $in _charset, String $out _charset, String $str)

Six, picture rotation

Imagerotate ()//Set angle of the picture flip

The flip of the picture

Flip along the x axis along the y axis

Eight, sharpening

Imagecolorsforindex ()

Imagecolorat ()

Draw a graphic on a picture
$img =imagecreatefromgif ("./images/map.gif");
$red = Imagecolorallocate ($img, 255, 0, 0);

Imageline ($img, 0, 0, $red);

Imageellipse ($img, MB, $red);

Imagegif ($img, "./images/map2.gif");

Imagedestroy ($img); general scaling of pictures

$filename = "./images/hee.jpg";

$per = 0.3;

List ($width, $height) =getimagesize ($filename);

$n _w= $width * $per;
$n _h= $width * $per;

$new =imagecreatetruecolor ($n _w, $n _h);

$img =imagecreatefromjpeg ($filename);
Copy part of the image and adjust

Imagecopyresized ($new, $img, 0, 0,0, 0, $n _w, $n _h, $width, $height);
Image output new picture, Save As

Imagejpeg ($new, "./images/hee2.jpg");

Imagedestroy ($new);
Imagedestroy ($img); picture scaling, no transparent color processing

function Thumn ($background, $width, $height, $newfile) {
List ($s _w, $s _h) =getimagesize ($background);//Get the original picture height, width

if ($width && ($s _w < $s _h)) {
$width = ($height/$s _h) * $s _w;
} else {
$height = ($width/$s _w) * $s _h;
}

$new =imagecreatetruecolor ($width, $height);

$img =imagecreatefromjpeg ($background);

Imagecopyresampled ($new, $img, 0, 0, 0, 0, $width, $height, $s _w, $s _h);

Imagejpeg ($new, $newfile);

Imagedestroy ($new);
Imagedestroy ($IMG);
}

Thumn ("Images/hee.jpg", MB, "./images/hee3.jpg"); GIF transparent color processing

function Thumn ($background, $width, $height, $newfile) {
List ($s _w, $s _h) =getimagesize ($background);

if ($width && ($s _w < $s _h)) {
$width = ($height/$s _h) * $s _w;
} else {
$height = ($width/$s _w) * $s _h;
}

$new =imagecreatetruecolor ($width, $height);

$img =imagecreatefromgif ($background);

$OTSC =imagecolortransparent ($IMG);
if ($OTSC >=0 && $otst < Imagecolorstotal ($img)) {//Judging index color
$tran =imagecolorsforindex ($img, $OTSC);//Index color value

$newt =imagecolorallocate ($new, $tran ["Red"], $tran ["Green"], $tran ["Blue"]);

Imagefill ($new, 0, 0, $NEWT);

Imagecolortransparent ($new, $NEWT);
}

Imagecopyresized ($new, $img, 0, 0, 0, 0, $width, $height, $s _w, $s _h);

Imagegif ($new, $newfile);

Imagedestroy ($new);
Imagedestroy ($IMG);
}

Thumn ("Images/map.gif", MB, "./images/map3.gif"); picture cropping

function Cut ($background, $cut _x, $cut _y, $cut _width, $cut _height, $location) {

$back =imagecreatefromjpeg ($background);

$new =imagecreatetruecolor ($cut _width, $cut _height);

Imagecopyresampled ($new, $back, 0, 0, $cut _x, $cut _y, $cut _width, $cut _height, $cut _width, $cut _height);

Imagejpeg ($new, $location);

Imagedestroy ($new);
Imagedestroy ($back);
}

Cut ("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg"); Picture plus watermark

Text watermark

function Mark_text ($background, $text, $x, $y) {
$back =imagecreatefromjpeg ($background);

$color =imagecolorallocate ($back, 0, 255, 0);

Imagettftext ($back, 0, $x, $y, $color, "Simkai.ttf", $text);

Imagejpeg ($back, "./images/hee7.jpg");

Imagedestroy ($back);
}

Mark_text ("./images/hee.jpg", "PHP in detail", 150, 250);

Picture watermark
function Mark_pic ($background, $waterpic, $x, $y) {
$back =imagecreatefromjpeg ($background);
$water =imagecreatefromgif ($waterpic);
$w _w=imagesx ($water);
$w _h=imagesy ($water);
Imagecopy ($back, $water, $x, $y, 0, 0, $w _w, $w _h);
Imagejpeg ($back, "./images/hee8.jpg");
Imagedestroy ($back);
Imagedestroy ($water);
}
Mark_pic ("./images/hee.jpg", "./images/gaolf.gif", 50, 200); Picture rotation

$back =imagecreatefromjpeg ("./images/hee.jpg");

$new =imagerotate ($back, 45, 0);

Imagejpeg ($new, "./images/hee9.jpg"); Picture horizontal Flip Vertical Flip

function turn_y ($background, $newfile) {
$back =imagecreatefromjpeg ($background);

$width =imagesx ($back);
$height =imagesy ($back);

$new =imagecreatetruecolor ($width, $height);

for ($x =0; $x < $width; $x + +) {
Imagecopy ($new, $back, $width-$x-1, 0, $x, 0, 1, $height);
}

Imagejpeg ($new, $newfile);

Imagedestroy ($back);
Imagedestroy ($new);
}

function turn_x ($background, $newfile) {
$back =imagecreatefromjpeg ($background);

$width =imagesx ($back);
$height =imagesy ($back);

$new =imagecreatetruecolor ($width, $height);

for ($y =0; $y < $height; $y + +) {
Imagecopy ($new, $back, 0, $height-$y-1, 0, $y, $width, 1);
}

Imagejpeg ($new, $newfile);

Imagedestroy ($back);
Imagedestroy ($new);
}

Turn_y ("./images/hee.jpg", "./images/hee11.jpg");
Turn_x ("./images/hee.jpg", "./images/hee12.jpg"); Picture Sharpening

Function Sharp ($background, $degree, $save) {
$back =imagecreatefromjpeg ($background);

$b _x=imagesx ($back);
$b _y=imagesy ($back);

$DST =imagecreatefromjpeg ($background);
for ($i =0; $i < $b _x; $i + +) {
for ($j =0; $j < $b _y; $j + +) {
$b _clr1=imagecolorsforindex ($back, Imagecolorat ($back, $i-1, $j-1)); \ previous pixel color array
$b _clr2=imagecolorsforindex ($back, Imagecolorat ($back, $i, $j)); \ Remove the current array of colors

$r =intval ($b _clr2["Red"]+ $degree * ($b _clr2["Red"]-$b _clr1["Red"));
$g =intval ($b _clr2["green"]+ $degree * ($b _clr2["green"]-$b _clr1["green"));
$b =intval ($b _clr2["Blue"]+ $degree * ($b _clr2["Blue"]-$b _clr1["Blue"));

$r =min (255, Max ($r, 0))//limit R range between 0-255
$g =min (255, Max ($g, 0));
$b =min (255, Max ($b, 0));

if ($d _clr=imagecolorexact ($DST, $r, $g, $b)) {//equals 1 not in color range
$d _clr=imagecolorallocate ($DST, $r, $g, $b);//Create a color
}

Imagesetpixel ($DST, $i, $j, $d _clr);
}

}
Imagejpeg ($DST, $save);
Imagedestroy ($back);
Imagedestroy ($DST);
}

Sharp ("./images/hee.jpg", "./images/hee13.jpg"); October 26th, 2011No comments yet sincere to PHP design implementation and application of authentication code class
validationcode.class.php

/* Develop a validation code class
*
* 1. What is a verification code
*
* 2. The role of the Verification code
*
* 3. Write Verification Code Class (PHP image processing)
*
* 4. Using verification Code
*
*
*/<?php
Class Validationcode {
Private $width;
Private $height;
Private $codeNum;
Private $image; Image Resources
Private $disturbColorNum;
Private $checkCode;

function __construct ($width =80, $height =20, $codeNum =4) {
$this->width= $width;
$this->height= $height;
$this->codenum= $codeNum;
$this->checkcode= $this->createcheckcode ();
$number =floor ($width * $height/15);

if ($number > 240-$codeNum) {
$this->disturbcolornum= 240-$codeNum;
}else{
$this->disturbcolornum= $number;
}

}
To output an image to a browser by accessing this method
function ShowImage ($fontFace = "") {
First step: Create an image background
$this->createimage ();
Step two: Set the jamming elements
$this->setdisturbcolor ();
Step three: Draw the text randomly to the image
$this->outputtext ($fontFace);
Fourth Step: Output image
$this->outputimage ();
}

Obtain a randomly created authentication code string by calling this method
function Getcheckcode () {
return $this->checkcode;
}

  private function CreateImage () {
   //Create an image resource
    $this-> Image=imagecreatetruecolor ($this->width, $this->height);
   //random background color
    $backColor =imagecolorallocate ($this->image, rand (225, 255) , Rand (225,255), rand (225, 255));
   //adds color to background
   imagefill ($this->image, 0, 0, $backColor);
    //set Border color
    $border =imagecolorallocate ($this->image, 0, 0, 0);
    //draws a rectangular border
   imagerectangle ($this->image, 0, 0, $this->width-1, $this->height-1, $ border);
  }

Private Function Setdisturbcolor () {
For ($i =0 $i < $this->disturbcolornum; $i + +) {
$color =imagecolorallocate ($this->image, rand (0, 255), rand (0, 255), rand (0, 255));
Imagesetpixel ($this->image, rand (1, $this->width-2), rand (1, $this->height-2), $color);
}

For ($i =0 $i <10; $i + +) {
$color =imagecolorallocate ($this->image, rand (255), Rand (255), rand (200, 255));
Imagearc ($this->image, rand ( -10, $this->width), rand ( -10, $this->height), rand (+), rand (20, 200), 55, 44, $color);
}
}

Private Function Createcheckcode () {
$code = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
$string = ';
For ($i =0 $i < $this->codenum; $i + +) {
$char = $code {rand (0, strlen ($code)-1)};
$string. = $char;
}

return $string;
}

Private Function outputtext ($fontFace = "") {
For ($i =0 $i < $this->codenum; $i + +) {
$fontcolor =imagecolorallocate ($this->image, rand (0, 128), rand (0, 128), rand (0, 128));
if ($fontFace = = "") {
$fontsize =rand (3, 5);
$x =floor ($this->width/$this->codenum) * $i +3;
$y =rand (0, $this->height-15);
Imagechar ($this->image, $fontsize, $x, $y, $this->checkcode{$i}, $fontcolor);
}else{
$fontsize =rand (12, 16);
$x =floor (($this->width-8)/$this->codenum) * $i +8;
$y =rand ($fontSize +5, $this->height);
Imagettftext ($this->image, $fontsize, Rand ( -30), $x, $y, $fontcolor, $fontFace, $this->checkcode{$i});
}
}
}

Private Function Outputimage () {
if (Imagetypes () & Img_gif) {
Header ("Content-type:image/gif");
Imagepng ($this->image);
}else if (Imagetypes () & img_jpg) {
Header ("Content-type:image/jpeg");
Imagepng ($this->image);
}else if (Imagetypes () & Img_png) {
Header ("Content-type:image/png");
Imagepng ($this->image);
}else if (Imagetypes () & Img_wbmp) {
Header ("Content-type:image/vnd.wap.wbmp");
Imagepng ($this->image);
}else{
Die ("PHP does not support image creation");
}
}

function __destruct () {
Imagedestroy ($this->image);
}
}code.php

<?php
Session_Start ();
Include "validationcode.class.php";

$code =new Validationcode (80, 20, 4);

$code->showimage (); Output to a page for registration or logon use

$_session["code"]= $code->getcheckcode (); Save the Authenticode to the server demo.php

<?php
Session_Start ();
echo $_post["code"]. " <br> ";
echo $_session["code"]. " <br> ";

if (Strtoupper ($_post["code"]) ==strtoupper ($_session["code")) {
echo "OK";
}else{
echo "Error";
}
?>
<body>
<form action= "login.php" method= "POST" >
User:<input type= "text" name= "Usenrame" ><br>
Pass:<input type= "PASSOWRD" name= "Pass" ><br>

Code: <input type= "text" name= "code" onkeyup= "if (This.value!=this.value.touppercase ()) this.value= This.value.toUpperCase () "> <br>

<input type= "Submit" Name= "sub" value= "Login" ><br>
</form>
</body>

1. Drawing

Verification Code, Statistics chart

Install the GD library (Picture processing library)

Create a canvas--Create a resource type--– height, width
Drawing images
1, the development of a variety of colors
2, Rectangle, garden, point, line segment, fan, reprint (character, string, FreeType font), each image corresponds to a function

Output image/Save processed image
1, output various types (GIF, PNG, JPEG)

Imagegif ();
Imagepng ();
Imagegpeg ();

Releasing resources
<?php
Step 1 Create a picture resource
$img =imagecreatetruecolor (200,200);
$red =imagecolorallocate ($img, 255,0,0);
$yellow =imagecolorallocate ($img, 255,255,0);
$green =imagecolorallocate ($img, 0,255,0);
$blue =imagecolorallocate ($img, 0,0,255);
Imagefill ($img, 0,0, $yellow);//Color fill
Step2 draw all kinds of graphics
Imagefilledrectangle ($img, 10,10,80,80, $red);//Draw Rectangle and fill
Imagerectangle ($img, 10,10,80,80, $red))//Draw rectangle not filled, color fill

Segment
Imageline ($img, 0, 0, $blue);
Imageline ($img, 0, 0, $blue);

Point
Imagesetpixel ($img, M, $red);
Imagesetpixel ($img, $red);
Imagesetpixel ($img, $red);
Imagesetpixel ($img, EUR, $red);
Imagesetpixel ($img, $red);

Round
Imageellipse ($img, MB, $green);
Round
Imagefilledellipse ($img, $blue);
Border
Output an image or save an image
Header ("Content-type:img/gif");
Imagegif ($IMG);
Releasing resources
Imagedestory ($IMG);

Gao shape diagram

Step 1 Create a picture resource
$img =imagecreatetruecolor (200, 200);

$img =imagecreate (200, 200);

$white =imagecolorallocate ($img, 255, 255, 255);
$gray =imagecolorallocate ($img, 0xc0, 0xc0, 0xc0);
$darkgray =imagecolorallocate ($img, 0x90, 0x90, 0x90);
$navy =imagecolorallocate ($img, 0, 0, 0x80);
$darknavy =imagecolorallocate ($img, 0, 0, 0x50);
$red = Imagecolorallocate ($img, 0xFF, 0, 0);
$darkred =imagecolorallocate ($img, 0x90, 0, 0);

Imagefill ($img, 0, 0, $white);

3D effect
For ($i =60 $i >50; $i-) {
Imagefilledarc ($img, $i, M, -160, $darkgray, Img_arc_pie);
Imagefilledarc ($img, $i, M, N, $darknavy, Img_arc_pie);
Imagefilledarc ($img, $i, M, N, $darkred, Img_arc_pie);
}
Imagefilledarc ($img, $i, M, -160, $gray, Img_arc_pie);
Imagefilledarc ($img, $i, M, N, $navy, Img_arc_pie);
Imagefilledarc ($img, $i, M, N, $red, Img_arc_pie);

Header ("Content-type:image/gif");
Imagegif ($IMG);

Releasing resources
Imagedestroy ($IMG);

<?php

Step 1 Create a picture resource
$img =imagecreatetruecolor (200, 200);

$img =imagecreate (200, 200);

$white =imagecolorallocate ($img, 255, 255, 255);
$gray =imagecolorallocate ($img, 0xc0, 0xc0, 0xc0);
$darkgray =imagecolorallocate ($img, 0x90, 0x90, 0x90);
$navy =imagecolorallocate ($img, 0, 0, 0x80);
$darknavy =imagecolorallocate ($img, 0, 0, 0x50);
$red = Imagecolorallocate ($img, 0xFF, 0, 0);
$darkred =imagecolorallocate ($img, 0x90, 0, 0);

Imagefill ($img, 0, 0, $gray);

Imagechar ($img, 5, MB, "A", $red);
Imagechar ($img, 5, A., "B", $red);
Imagecharup ($img, 5,,, "C", $red);
Imagecharup ($img, 5,,, "D", $red);

Imagestring ($img, 3, ten, "Hello", $navy);
Imagestringup ($img, 3, ten, "Hello", $navy);

Imagettftext ($img, the $red, "Simkai.ttf", "# #");
Imagettftext ($img, -60,, $red, "Simli.ttf", "# #");

Header ("Content-type:image/gif");
Imagegif ($IMG);

Releasing resources
Imagedestroy ($img); 2, processing the original image