PHP uses the Imagick module to implement image scaling, cropping, and compression examples _php tutorial

PHP uses the Imagick module to scale, crop, compress pictures including GIF images

Zoom crop

Copy CodeThe code is as follows:
/**
* Picture Clipping
* Cropping rules:
* 1. Height is empty or zero by width scaling height adaptive
* 2. Width is empty or zero is adaptive by height scaling relaxation
* 3. width, height to not null, or zero by width-to-height scaling crop by default center-trimmed from head
* @param number $width
* @param number $height
*/
Public Function Resize ($width =0, $height =0) {
if ($width ==0 && $height ==0) {
Return
}

$color = ';//' Rgba (255,255,255,1) ';
$size = $this->image->getimagepage ();
Original width height
$SRC _width = $size [' width '];
$SRC _height = $size [' height '];

Scale height adaptive by width
if ($width!=0 && $height ==0) {
if ($src _width> $width) {
$height = Intval ($width * $src _height/$src _width);

if ($this->type = = = ' gif ') {
$this->_resizegif ($width, $height);
}else{
$this->image->thumbnailimage ($width, $height, true);
}
}
Return
}
Adaptive to height-scaling relaxation
if ($width ==0 && $height!=0) {
if ($src _height> $height) {
$width = intval ($src _width* $height/$src _height);

if ($this->type = = = ' gif ') {
$this->_resizegif ($width, $height);
}else{
$this->image->thumbnailimage ($width, $height, true);
}
}
Return
}

Size after scaling
$crop _w = $width;
$crop _h = $height;

Where to crop after zooming
$crop _x = 0;
$crop _y = 0;

if (($src _width/$src _height) < ($width/$height)) {
The ratio of the width to height is smaller than the target width and height ratio, and the magnification is intercepted from the head by target
$crop _h = intval ($src _height* $width/$src _width);
Crop from top without calculation $crop _y
}else{
The ratio of wide to high is greater than the target width and height proportional to the center clipping by the target width
$crop _w = intval ($src _width* $height/$src _height);
$crop _x = Intval (($crop _w-$width)/2);
}

if ($this->type = = = ' gif ') {
$this->_resizegif ($crop _w, $crop _h, True, $width, $height, $crop _x, $crop _y);
} else {
$this->image->thumbnailimage ($crop _w, $crop _h, True);
$this->image->cropimage ($width, $height, $crop _x, $crop _y);
}
}

How to handle GIF pictures

Copy CodeThe code is as follows:
/**
* Processing GIF images requires a picture processing for each frame
* @param unknown $t _w Relaxation
* @param unknown $t _h Zoom High
* @param string $isCrop whether to crop
* @param number $c _w clipping width
* @param number $c _h cut high
* @param number $c _x clipping coordinates x
* @param number $c _y crop coordinates y
*/
Private Function _resizegif ($t _w, $t _h, $isCrop =false, $c _w=0, $c _h=0, $c _x=0, $c _y=0) {
$dest = new Imagick ();
$color _transparent = new Imagickpixel ("Transparent"); Transparent Color
foreach ($this->image as $img) {
$page = $img->getimagepage ();
$tmp = new Imagick ();
$tmp->newimage ($page [' width '], $page [' height '], $color _transparent, ' gif ');
$tmp->compositeimage ($img, Imagick::composite_over, $page [' X '], $page [' Y ']);

$tmp->thumbnailimage ($t _w, $t _h, True);
if ($isCrop) {
$tmp->cropimage ($c _w, $c _h, $c _x, $c _y);
}

$dest->addimage ($tmp);
$dest->setimagepage ($tmp->getimagewidth (), $tmp->getimageheight (), 0, 0);
$dest->setimagedelay ($img->getimagedelay ());
$dest->setimagedispose ($img->getimagedispose ());

}
$this->image->destroy ();
$this->image = $dest;
}

Save-time Compression processing

Copy the Code code as follows:
Save to specified path
Public Function save_to ($path) {
Compress picture quality
$this->image->setimageformat (' JPEG ');
$this->image->setimagecompression (imagick::compression_jpeg);
$a = $this->image->getimagecompressionquality () * 0.60;
if ($a = = 0) {
$a = 60;
}
$this->image->setimagecompressionquality ($a);
$this->image->stripimage ();

if ($this->type = = = ' gif ') {
$this->image->writeimages ($path, true);
} else {
$this->image->writeimage ($path);
}
}

imagickservice.php

Copy the Code code as follows:

/**
* Image Processing Service class
* Implemented with PHP extension Service Imagick
* ImageMagick website address [Url]http:www.imagemagick.org/script/index.php[/url]
*
* @author Weiguang3
* @since 20140403
*/
Class Imagickservice {
Private $image = null;
Private $type = null;

constructor function
Public Function __construct () {
}

Destructors
Public Function __destruct () {
if ($this->image!== null)
$this->image->destroy ();
}

Public Function init () {

}

Loading images
Public function Open ($path) {
$this->image = new Imagick ($path);
if ($this->image) {
$this->type = Strtolower ($this->image->getimageformat ());
}
return $this->image;
}

/**
* Picture Clipping
* Cropping rules:
* 1. Height is empty or zero by width scaling height adaptive
* 2. Width is empty or zero is adaptive by height scaling relaxation
* 3. width, height to not null, or zero by width-to-height scaling crop by default center-trimmed from head
* @param number $width
* @param number $height
*/
Public Function Resize ($width =0, $height =0) {
if ($width ==0 && $height ==0) {
Return
}

$color = ';//' Rgba (255,255,255,1) ';
$size = $this->image->getimagepage ();
Original width height
$SRC _width = $size [' width '];
$SRC _height = $size [' height '];

Scale height adaptive by width
if ($width!=0 && $height ==0) {
if ($src _width> $width) {
$height = Intval ($width * $src _height/$src _width);

if ($this->type = = = ' gif ') {
$this->_resizegif ($width, $height);
}else{
$this->image->thumbnailimage ($width, $height, true);
}
}
Return
}
Adaptive to height-scaling relaxation
if ($width ==0 && $height!=0) {
if ($src _height> $height) {
$width = intval ($src _width* $height/$src _height);

if ($this->type = = = ' gif ') {
$this->_resizegif ($width, $height);
}else{
$this->image->thumbnailimage ($width, $height, true);
}
}
Return
}

Size after scaling
$crop _w = $width;
$crop _h = $height;

Where to crop after zooming
$crop _x = 0;
$crop _y = 0;

if (($src _width/$src _height) < ($width/$height)) {
The ratio of the width to height is smaller than the target width and height ratio, and the magnification is intercepted from the head by target
$crop _h = intval ($src _height* $width/$src _width);
Crop from top without calculation $crop _y
}else{
The ratio of wide to high is greater than the target width and height proportional to the center clipping by the target width
$crop _w = intval ($src _width* $height/$src _height);
$crop _x = Intval (($crop _w-$width)/2);
}

if ($this->type = = = ' gif ') {
$this->_resizegif ($crop _w, $crop _h, True, $width, $height, $crop _x, $crop _y);
} else {
$this->image->thumbnailimage ($crop _w, $crop _h, True);
$this->image->cropimage ($width, $height, $crop _x, $crop _y);
}
}

/**
* Processing GIF images requires a picture processing for each frame
* @param unknown $t _w Relaxation
* @param unknown $t _h Zoom High
* @param string $isCrop whether to crop
* @param number $c _w clipping width
* @param number $c _h cut high
* @param number $c _x clipping coordinates x
* @param number $c _y crop coordinates y
*/
Private Function _resizegif ($t _w, $t _h, $isCrop =false, $c _w=0, $c _h=0, $c _x=0, $c _y=0) {
$dest = new Imagick ();
$color _transparent = new Imagickpixel ("Transparent"); Transparent Color
foreach ($this->image as $img) {
$page = $img->getimagepage ();
$tmp = new Imagick ();
$tmp->newimage ($page [' width '], $page [' height '], $color _transparent, ' gif ');
$tmp->compositeimage ($img, Imagick::composite_over, $page [' X '], $page [' Y ']);

$tmp->thumbnailimage ($t _w, $t _h, True);
if ($isCrop) {
$tmp->cropimage ($c _w, $c _h, $c _x, $c _y);
}

$dest->addimage ($tmp);
$dest->setimagepage ($tmp->getimagewidth (), $tmp->getimageheight (), 0, 0);
$dest->setimagedelay ($img->getimagedelay ());
$dest->setimagedispose ($img->getimagedispose ());

}
$this->image->destroy ();
$this->image = $dest;
}


/**
* Change image size
* $fit: Fit to size mode
* ' Force ': Forces the image to form $width X $height size
* ' scale ': scales the picture proportionally in the safe box $width x $height, the image size is not exactly equal to $width x when the output is scaled $height
* ' Scale_fill ': Scale the picture proportionally in the safe box $width X $height, where there is no pixel in the security box, fill the color,
* Background fill color can be set when using this parameter $BG _color = Array (255,255,255) (red, green, blue, transparency)
* Transparency (0 opaque-127 fully transparent)) Other: Smart mode can scale the image and load the middle part of the image $width X $height pixel size
* $fit = ' force ', ' scale ', ' Scale_fill ' When: Output full image
* $fit = Image azimuth value, output the corresponding relationship between the image letter and the image in the specified position is as follows:
* North_west North North_east
* West Center East
* South_west South South_east
*/
Public Function resize_to ($width = $height, $fit = ' center ', $fill _color = Array (255,255,255,0)) {
Switch ($fit) {
Case ' Force ':
if ($this->type = = = ' gif ') {
$image = $this->image;
$canvas = new Imagick ();

$images = $image->coalesceimages ();
foreach ($images as $frame) {
$img = new Imagick ();
$img->readimageblob ($frame);
$img->thumbnailimage ($width, $height, false);

$canvas->addimage ($IMG);
$canvas->setimagedelay ($img->getimagedelay ());
}
$image->destroy ();
$this->image = $canvas;
} else {
$this->image->thumbnailimage ($width, $height, false);
}
Break
Case ' scale ':
if ($this->type = = = ' gif ') {
$image = $this->image;
$images = $image->coalesceimages ();
$canvas = new Imagick ();
foreach ($images as $frame) {
$img = new Imagick ();
$img->readimageblob ($frame);
$img->thumbnailimage ($width, $height, true);

$canvas->addimage ($IMG);
$canvas->setimagedelay ($img->getimagedelay ());
}
$image->destroy ();
$this->image = $canvas;
} else {
$this->image->thumbnailimage ($width, $height, true);
}
Break
Case ' Scale_fill ':
$size = $this->image->getimagepage ();
$SRC _width = $size [' width '];
$SRC _height = $size [' height '];

$x = 0;
$y = 0;

$DST _width = $width;
$DST _height = $height;

if ($src _width * $height > $SRC _height * $width) {
$DST _height = intval ($width * $src _height/$src _width);
$y = Intval (($height-$DST _height)/2);
} else {
$DST _width = intval ($height * $src _width/$src _height);
$x = Intval (($width-$DST _width)/2);
}

$image = $this->image;
$canvas = new Imagick ();

$color = ' Rgba ('. $fill _color [0]. ',' . $fill _color [1]. ',' . $fill _color [2]. ',' . $fill _color [3]. ')';
if ($this->type = = = ' gif ') {
$images = $image->coalesceimages ();
foreach ($images as $frame) {
$frame->thumbnailimage ($width, $height, true);

$draw = new Imagickdraw ();
$draw->composite ($frame->getimagecompose (), $x, $y, $dst _width, $dst _height, $frame);

$img = new Imagick ();
$img->newimage ($width, $height, $color, ' gif ');
$img->drawimage ($draw);

$canvas->addimage ($IMG);
$canvas->setimagedelay ($img->getimagedelay ());
$canvas->setimagepage ($width, $height, 0, 0);
}
} else {
$image->thumbnailimage ($width, $height, true);

$draw = new Imagickdraw ();
$draw->composite ($image->getimagecompose (), $x, $y, $dst _width, $dst _height, $image);

$canvas->newimage ($width, $height, $color, $this->get_type ());
$canvas->drawimage ($draw);
$canvas->setimagepage ($width, $height, 0, 0);
}
$image->destroy ();
$this->image = $canvas;
Break
Default:
$size = $this->image->getimagepage ();
$SRC _width = $size [' width '];
$SRC _height = $size [' height '];

$crop _x = 0;
$crop _y = 0;

$crop _w = $src _width;
$crop _h = $src _height;

if ($src _width * $height > $SRC _height * $width) {
$crop _w = intval ($src _height * $width/$height);
} else {
$crop _h = intval ($src _width * $height/$width);
}

Switch ($fit) {
Case ' north_west ':
$crop _x = 0;
$crop _y = 0;
Break
Case ' North ':
$crop _x = Intval (($src _width-$crop _w)/2);
$crop _y = 0;
Break
Case ' North_east ':
$crop _x = $src _width-$crop _w;
$crop _y = 0;
Break
Case ' West ':
$crop _x = 0;
$crop _y = Intval (($src _height-$crop _h)/2);
Break
Case ' center ':
$crop _x = Intval (($src _width-$crop _w)/2);
$crop _y = Intval (($src _height-$crop _h)/2);
Break
Case ' East ':
$crop _x = $src _width-$crop _w;
$crop _y = Intval (($src _height-$crop _h)/2);
Break
Case ' south_west ':
$crop _x = 0;
$crop _y = $src _height-$crop _h;
Break
Case ' South ':
$crop _x = Intval (($src _width-$crop _w)/2);
$crop _y = $src _height-$crop _h;
Break
Case ' South_east ':
$crop _x = $src _width-$crop _w;
$crop _y = $src _height-$crop _h;
Break
Default:
$crop _x = Intval (($src _width-$crop _w)/2);
$crop _y = Intval (($src _height-$crop _h)/2);
}

$image = $this->image;
$canvas = new Imagick ();

if ($this->type = = = ' gif ') {
$images = $image->coalesceimages ();
foreach ($images as $frame) {
$img = new Imagick ();
$img->readimageblob ($frame);
$img->cropimage ($crop _w, $crop _h, $crop _x, $crop _y);
$img->thumbnailimage ($width, $height, true);

$canvas->addimage ($IMG);
$canvas->setimagedelay ($img->getimagedelay ());
$canvas->setimagepage ($width, $height, 0, 0);
}
} else {
$image->cropimage ($crop _w, $crop _h, $crop _x, $crop _y);
$image->thumbnailimage ($width, $height, true);
$canvas->addimage ($image);
$canvas->setimagepage ($width, $height, 0, 0);
}
$image->destroy ();
$this->image = $canvas;
}
}

Add a watermark Picture
Public Function Add_watermark ($path, $x = 0, $y = 0) {
$watermark = new Imagick ($path);
$draw = new Imagickdraw ();
$draw->composite ($watermark->getimagecompose (), $x, $y, $watermark->getimagewidth (), $watermark Getimageheight (), $watermark);

if ($this->type = = = ' gif ') {
$image = $this->image;
$canvas = new Imagick ();
$images = $image->coalesceimages ();
foreach ($image as $frame) {
$img = new Imagick ();
$img->readimageblob ($frame);
$img->drawimage ($draw);

$canvas->addimage ($IMG);
$canvas->setimagedelay ($img->getimagedelay ());
}
$image->destroy ();
$this->image = $canvas;
} else {
$this->image->drawimage ($draw);
}
}

Add watermark Text
Public Function Add_text ($text, $x = 0, $y = 0, $angle = 0, $style = Array ()) {
$draw = new Imagickdraw ();
if (Isset ($style [' Font ']))
$draw->setfont ($style [' font ']);
if (Isset ($style [' font_size ']))
$draw->setfontsize ($style [' font_size ']);
if (Isset ($style [' Fill_color ']))
$draw->setfillcolor ($style [' Fill_color ']);
if (Isset ($style [' Under_color ']))
$draw->settextundercolor ($style [' Under_color ']);

if ($this->type = = = ' gif ') {
foreach ($this->image as $frame) {
$frame->annotateimage ($draw, $x, $y, $angle, $text);
}
} else {
$this->image->annotateimage ($draw, $x, $y, $angle, $text);
}
}

Save to specified path
Public Function save_to ($path) {
Compress picture quality
$this->image->setimageformat (' JPEG ');
$this->image->setimagecompression (imagick::compression_jpeg);
$a = $this->image->getimagecompressionquality () * 0.60;
if ($a = = 0) {
$a = 60;
}
$this->image->setimagecompressionquality ($a);
$this->image->stripimage ();

if ($this->type = = = ' gif ') {
$this->image->writeimages ($path, true);
} else {
$this->image->writeimage ($path);
}
}

Output image
Public function output ($header = True) {
if ($header)
Header (' Content-type: '. $this->type);
echo $this->image->getimagesblob ();
}
Public Function Get_width () {
$size = $this->image->getimagepage ();
return $size [' width '];
}
Public Function Get_height () {
$size = $this->image->getimagepage ();
return $size [' height '];
}

Set image type, default to Source type
Public Function Set_type ($type = ' png ') {
$this->type = $type;
$this->image->setimageformat ($type);
}

Get Source Image Type
Public Function Get_type () {
return $this->type;
}

Public Function get_file_size () {
if ($this->image) {
return 0;//$this->image->getimagelength (); Getimagelength not find
}else{
return 0;
}
}

Public Function Get_file_type () {
if ($this->image) {
return $this->image->getimagemimetype ();
}else{
return 0;
}
}

Public Function Get_sha1 () {
if ($this->image) {
Return SHA1 ($this->image->__tostring ());
}else{
Return ';
}
}

Whether the current object is a picture
Public Function Is_image () {
if ($this->image)
return true;
Else
return false;
}

/*
* Add a border $width: Left and Right border width $height: top and Bottom Border width $color: color: RGB color ' rgb (255,0,0) ' or 16 binary color ' #FF0000 ' or color word ' white '/' red ' ...
*/
Public function border ($width, $height, $color = ' rgb (220, 220, 220) ') {
$color = new Imagickpixel ();
$color->setcolor ($color);
$this->image->borderimage ($color, $width, $height);
}
Public function blur ($radius, $sigma) {
$this->image->blurimage ($radius, $sigma);
}//Blur
Public Function Gaussian_blur ($radius, $sigma) {
$this->image->gaussianblurimage ($radius, $sigma);
}//Gaussian Blur
Public Function Motion_blur ($radius, $sigma, $angle) {
$this->image->motionblurimage ($radius, $sigma, $angle);
}//Motion blur
Public Function Radial_blur ($radius) {
$this->image->radialblurimage ($radius);
}//Radial blur
Public Function add_noise ($type = null) {
$this->image->addnoiseimage ($type = = null? Imagick::noise_impulse: $type);
}//Add noise
Public Function level ($black _point, $gamma, $white _point) {
$this->image->levelimage ($black _point, $gamma, $white _point);
}//Adjust the color scale
Public function modulate ($brightness, $saturation, $hue) {
$this->image->modulateimage ($brightness, $saturation, $hue);
}//adjust brightness, saturation, hue
Public function Charcoal ($radius, $sigma) {
$this->image->charcoalimage ($radius, $sigma);
}//Sketch
Public Function Oil_paint ($radius) {
$this->image->oilpaintimage ($radius);
}//Oil painting effect
Public Function flop () {
$this->image->flopimage ();
}//Flip horizontally
Public Function Flip () {
$this->image->flipimage ();
}//Flip vertically
}

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