Heim > Artikel > Backend-Entwicklung > So implementieren Sie PHP-Code zur Verarbeitung von Bildern
In diesem Artikel wird hauptsächlich die Implementierung von PHP-Code zur Verarbeitung von Bildern vorgestellt. Ich hoffe, dass er für alle hilfreich ist.
1. Bildskalierungscode
Nichtproportionaler Bildskalierungscode
$fileNames='./images/hee.jpg'; list($s_w,$s_h)=getimagesize($fileNames); $per=0.3; $n_w=$s_w*$per; $n_h=$s_h*$per; $s_img=imagecreatefromjpeg($fileNames); $n_img=imagecreatetruecolor($n_w,$n_h); imagecopyresized($n_img,$s_img,0,0,0,0,$n_w,$n_h,$s_w,$s_h); header("Content-Type:image/jpeg"); imagejpeg($n_img,'./images/hee2.jpg'); imagedestroy($n_img); imagedestroy($s_img); function sf($backgroung,$bl,$location){ list($width,$height)=getimagesize($backgroung); $n_w=$width*$bl; $n_h=$height*$bl; $s_img=imagecreatefromjpeg($backgroung); $n_img=imagecreatetruecolor($n_w,$n_h); imagecopyresized($n_img,$s_img,0,0,0,0,$n_w,$n_h,$width,$height); header("Content-Type:image/jpeg"); imagejpeg($n_img,$location); imagedestroy($s_img); imagedestroy($n_img); } //sf('./images/hee.jpg',0.3,'./images/hee9.jpg');
Isometrische Bildskalierung (und Hinzufügen transparenter Farbverarbeitung)
function imagesf($backgroung,$n_w,$n_h,$newFiles){ list($s_w,$s_h,$imagetype)=getimagesize($backgroung); //等比例缩放固定算法 if ($n_w && ($s_w < $s_h)) { $n_w = ($n_h / $s_h) * $s_w; } else { $n_h = ($n_w / $s_w) * $s_h; } if($imagetype==2){ $s_img=imagecreatefromjpeg($backgroung); }elseif($imagetype==3){ $s_img=imagecreatefrompng($backgroung); }elseif($imagetype==1){ $s_img=imagecreatefromgif($backgroung); }else{ echo "php 不支持这中图片类型!!"; } $n_img=imagecreatetruecolor($n_w,$n_h); //取得原图形的索引 $img_index=imagecolortransparent($s_img); //判断原图形索引是否在图形调色板的数目范围内(调色板数目 0~255); if($img_index>=0 && $img_index<imagecolorstotal($s_img)){ //返回一个具有 red,green,blue 和 alpha 的键名的关联数组,包含了指定颜色索引的相应的值 $trans=imagecolorsforindex($s_img,$img_index); //print_r($trans); Array ( [red] => 255 [green] => 255 [blue] => 255 [alpha] => 127 ) //取原图的颜色,给新图分配颜色 $n_color=imagecolorallocate($n_img,$trans['red'],$trans['green'],$trans['blue']); imagefill($n_img,0,0,$n_color); //把获取到的颜色,设置为新图的透明色 imagecolortransparent($n_img,$n_color); } //imagecopyresampled($n_img,$s_img,0,0,0,0,$n_w,$n_h,$s_w,$s_h); if(imagetypes()& IMG_JPG){ header("Content-Type:image/jpeg"); imagejpeg($n_img,$newFiles); }elseif(imagetypes()& IMG_PNG){ header("Content-Type:image/png"); imagepng($n_img,$newFiles); }elseif(imagetypes()& IMG_GIF){ header("Content-Type:image/gif"); imagegif($n_img,$newFiles); }else{ echo "php 不支持这中图片类型!!"; } imagedestroy($s_img); imagedestroy($n_img); } imagesf('./images/map.gif',200,200,'./images/map2.gif');
2. Bildzuschnittcode
Bildzuschnitt
function imagecut($backgroung,$cut_x,$cut_y,$cut_width,$cut_hight,$fileNames){ list(,,$imagetype)=getimagesize($backgroung); if($imagetype==1){ $s_img=imagecreatefromgif($backgroung); }elseif($imagetype==2){ $s_img=imagecreatefromjpeg($backgroung); }elseif($imagetype==2){ $s_img=imagecreatefrompng($backgroung); }else{ echo "php 不支持这种图片类型!!"; } $n_img=imagecreatetruecolor($cut_width,$cut_hight); imagecopyresized($n_img,$s_img,0,0,$cut_x,$cut_y,$cut_width,$cut_hight,$cut_width,$cut_hight); if(imagetypes() & IMG_GIF){ header("Content-Type:image/gif"); imagegif($n_img,$fileNames); }elseif(imagetypes() & IMG_JPG){ header("Content-Type:image/jpeg"); imagejpeg($n_img,$fileNames); }elseif(imagetypes() & IMG_PNG){ header("Content-Type:image/png"); imagepng($n_img,$fileNames); }else{ echo "php 不支持这种图片类型!!"; } } //imagecut('./images/hee.jpg',52, 47, 345, 330,'./images/hee4.jpg'); function cut($backgroung,$x,$y,$cut_width,$cut_hight,$location){ $s_img=imagecreatefromjpeg($backgroung); $n_img=imagecreatetruecolor($cut_width,$cut_hight); imagecopy($n_img,$s_img,0,0,$x,$y,$cut_width,$cut_hight); header("Content-Type:image/jpeg"); imagejpeg($n_img,$location); imagedestroy($s_img); imagedestroy($n_img); } //cut('./images/hee.jpg',52, 47, 345, 330,'./images/hee8.jpg');
Bild zuschneiden und das zugeschnittene Bild skalieren, anstatt das Bild proportional zu skalieren (d. h. einen Teil des Bildes kopieren und seine Größe ändern) imagecopyresized() – einen Teil des Bildes kopieren und seine Größe ändern
imagecopyresampled() – Teil der Bildkopie erneut abtasten und in der Größe ändern
function cutsf($backgroung,$x,$y,$cut_width,$cut_hight,$n_w,$n_h,$location){ $s_img=imagecreatefromjpeg($backgroung); $n_img=imagecreatetruecolor($n_w,$n_h); imagecopyresized($n_img,$s_img,0,0,$x,$y,$n_w,$n_h,$cut_width,$cut_hight); header("Content-Type:image/jpeg"); imagejpeg($n_img,$location); imagedestroy($s_img); imagedestroy($n_img); } cutsf('./images/hee.jpg',52, 47, 345, 330,200,200,'./images/hee10.jpg');
Drei, Textwasserzeichen zum Bild hinzufügen: Textwasserzeichen und Bildwasserzeichencode
Textwasserzeichen zum Bild hinzufügenfunction mark_text($backgroung,$x,$y,$text,$fileNames){ list(,,$imagetype)=getimagesize($backgroung); if($imagetype == 1){ $s_img=imagecreatefromgif($backgroung); }elseif($imagetype == 2){ $s_img=imagecreatefromjpeg($backgroung); }elseif($imagetype == 3){ $s_img=imagecreatefrompng($backgroung); } $green=imagecolorallocate($s_img,0,255,0); imagettftext($s_img,20,0,$x,$y,$green,'./font/msyh.ttf',$text); if(imagetypes() & IMG_GIF){ header("Content-Type:image/gif"); imagegif($s_img,$fileNames); }elseif(imagetypes() & IMG_JPG){ header("Content-Type:image/jpeg"); imagejpeg($s_img,$fileNames); }elseif(imagetypes() & IMG_PNG){ header("Content-Type:image/png"); imagepng($s_img,$fileNames); } imagedestroy($s_img); } $text=iconv('gb2312','utf-8','细说PHP'); //mark_text('./images/hee.jpg',150,250,$text,'./images/hee5.jpg');
Bildwasserzeichen zu Bildern hinzufügen
function mark_pic($backgroung,$x,$y,$waterpic,$fileNames){ $s_img=imagecreatefromjpeg($backgroung); $waterpic_img=imagecreatefromgif($waterpic); $waterpic_w=imagesx($waterpic_img); $waterpic_h=imagesy($waterpic_img); imagecopy( $s_img, $waterpic_img, $x,$y, 0,0, $waterpic_w,$waterpic_h); header("Content-Type:image/jpeg"); imagejpeg($s_img,$fileNames); imagedestroy($s_img); imagedestroy($waterpic_img); } //mark_pic('./images/hee.jpg',50,200,'./images/gaolf.gif','./images/hee6.jpg');
4. Bildrotationscode
Bildrotationsressource imagerotate( ) – Drehen Sie das Bild um einen bestimmten Winkel und geben Sie neue Ressourcen zurück
5. Drehen Sie das Bild um
Drehen Sie das Bild entlang der Y-Achse, also nach links und rechts
function imagexz($backgroung,$angle,$location){ $s_img=imagecreatefromjpeg($backgroung); $n_img=imagerotate($s_img,$angle,0); header("Content-Type:image/jpeg"); imagejpeg($n_img,$location); imagedestroy($s_img); imagedestroy($n_img); } imagexz('./images/hee.jpg',360,'images/hee10.jpg'); //90 180 270 360
Das Bild entlang der x-Achse zu spiegeln bedeutet, es nach oben und unten zu vertauschen
function turn_y($backgroung,$newFiles){ $s_img=imagecreatefromjpeg($backgroung); $width=imagesx($s_img); $height=imagesy($s_img); $n_img=imagecreatetruecolor($width,$height); for( $x=0; $x<$width; $x++ ){ imagecopy($n_img,$s_img, $width-$x-1,0, $x,0, 1,$height); } header("Content-Type:image/jpeg"); imagejpeg($n_img,$newFiles); imagedestroy($s_img); imagedestroy($n_img); } //turn_y('./images/hee.jpg','./images/hee11.jpg');
6. Bildschärfung
function turn_x($backgroung,$newFiles){ $s_img=imagecreatefromjpeg($backgroung); $width=imagesx($s_img); $height=imagesy($s_img); $n_img=imagecreatetruecolor($width,$height); for( $y=0; $y<$height; $y++ ){ imagecopy($n_img,$s_img, 0,$height-$y-1, 0,$y, $width,1); } header("Content-Type:image/jpeg"); imagejpeg($n_img,$newFiles); imagedestroy($s_img); imagedestroy($n_img); } //turn_x('./images/hee.jpg','./images/hee12.jpg');
Bildschärfung (analytisches Prinzip) (erhalten Sie zuerst die Farbe des Originalbilds und schärfen Sie dann die Farbe des Originalbildes und weisen Sie schließlich die geschärfte Farbe dem Originalbild zu)
根据解决在写一遍图片锐化代码 相关推荐:#解析开始:
#1 创建要锐化的图片资源
#eg:$s_img=imagecreatefromjpeg('./images/hee.jpg');
#2 获取图片资源的宽、高,创建两层循环(外层控制宽 内层控制高) 对每一个像素进行锐化
#eg:$width=imagesx($s_img);
# $height=imagesy($s_img);
# for($i=$width-1; $i>0; $i--){
# for($j=$height-1; $j>0; $j--){
#
# }
# }
#3 在内层循环里对每一个像素颜色进行锐化(写在内层循环):
#3.1 用函数$color=imagecolorsforindex()取得图片索引的颜色,即取得当前颜色和取得上一个颜色
#eg: $s_img_color1=imagecolorsforindex($s_img , imagecolorat($s_img , $i-1, $j-1));//上一个颜色
# $s_img_color2=imagecolorsforindex($s_img , imagecolorat($s_img , $i, $j));//当前颜色
#3.2 固定算法对取得的颜色进行锐化 比如锐化20:$degree=20
#eg:$r=intval($color["red"]+$degree*($color["red"]-$color["red"]));
# $g=intval($s_img_color2["green"]+$degree*($s_img_color2["green"]-$s_img_color1["green"]));
# $b=intval($s_img_color2["blue"]+$degree*($s_img_color2["blue"]-$s_img_color1["blue"]));
#3.3 把取得的RGB颜色控制在0~255正常范围内
#$r=min(255, max($r, 0));
#$g=min(255, max($g, 0));
#$b=min(255, max($b, 0));
#4 把锐化后的每一个像素颜色重新赋给原图的每一个像素颜色(写在内层循环)
#4.1 取得锐化后颜色的索引:$rh_color
#eg:if( ($rh_color=imagecolorexact($s_img,$r,$g,$b)) ==-1){
# $rh_color=imagecolorallocate($s_img,$r,$g,$b);
# }
#4.2 把锐化后的每一个像素颜色重新赋给原图的每一个像素颜色
eg:imagesetpixel($s_img, $i, $j, $rh_color);
#5 保存图片资源(写在循环外)
#eg:imagejpeg($s_img'./images/hee16.jpg');
#6 关闭图片资源(写在循环外)
#eg:imagedestroy($s_img);
#解析结束
function sharp($background, $degree, $location){
#step 1 创建图片资源
$s_img=imagecreatefromjpeg($background);
#step 2 获取图片资源的宽高
$b_x=imagesx($s_img);
$b_y=imagesy($s_img);
#step 3 两层循环进行锐化 外层控制宽 内层控制高
for( $i=$b_x-1; $i>0; $i-- ){
for( $j=$b_y-1; $j>0; $j-- ){
#step 4 取得图片索引的颜色:当前颜色和上一个颜色
$s_img_color1=imagecolorsforindex($s_img, imagecolorat($s_img, $i-1, $j-1));
$s_img_color2=imagecolorsforindex($s_img, imagecolorat($s_img, $i, $j));
#step 5 固定算法对取得的颜色进行锐化
$r=intval($s_img_color2["red"]+$degree*($s_img_color2["red"]-$s_img_color1["red"]));
$g=intval($s_img_color2["green"]+$degree*($s_img_color2["green"]-$s_img_color1["green"]));
$b=intval($s_img_color2["blue"]+$degree*($s_img_color2["blue"]-$s_img_color1["blue"]));
#step 6 把取得的RGB颜色控制在0~255正常范围内
$r=min(255, max($r, 0));
$g=min(255, max($g, 0));
$b=min(255, max($b, 0));
#step 7 取得锐化后颜色的索引
if( ($d_clr=imagecolorexact($s_img,$r,$g,$b)) ==-1){
$d_clr=imagecolorallocate($s_img,$r,$g,$b);
}
#step 8 把锐化后的颜色重新赋给图片资源的每一个像素
imagesetpixel($s_img, $i, $j, $d_clr);
}
}
imagejpeg($s_img,$location);
imagedestroy($s_img);
}
sharp('./images/hee.jpg',50,'./images/hee16.jpg');
Das obige ist der detaillierte Inhalt vonSo implementieren Sie PHP-Code zur Verarbeitung von Bildern. Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!