用php和imagemagick來處理圖片文件的上傳和縮放處理(轉(zhuǎn)貼)_PHP
Jun 01, 2016 pm 12:32 PM
用php和imagemagick來處理圖片文件的上傳和縮放處理
php處理文件的上傳是很簡(jiǎn)便的,但是如果要對(duì)上傳的圖片進(jìn)行縮放處理的話,雖說能用GD來做,但是
要進(jìn)行比較繁瑣的處理。ImageMagick是一個(gè)圖像處理包,一般的Linux軟件包中都會(huì)有的。它包含了許
多處理圖像的工具,它可以進(jìn)行圖像文件格式的轉(zhuǎn)化還可以對(duì)圖像進(jìn)行各種處理,其中我們將用到它的
圖像縮放功能。這個(gè)通過它的軟件包中的工具convert來實(shí)現(xiàn),這樣來調(diào)用
????????convert -geometry 寬x高 源文件 縮放后的文件
????????
請(qǐng)?jiān)诋?dāng)前目錄下建立一個(gè)images的目錄,并且能讓web執(zhí)行用戶可寫,這個(gè)目錄用來存放上載后的圖片和
縮放的圖片。
底下是一個(gè)簡(jiǎn)單小例子,包括圖片上傳和處理,在RedHat6.0+php3.0.12下測(cè)試通過。
uploadform.html:文件上傳表單
〈HTML>
〈HEAD>
〈TITLE>選擇文件〈/TITLE>
〈/HEAD>
〈BODY ALIGN="CENTER">
〈FORM ENCTYPE="multipart/form-data" ACTION="upload.php3" METHOD=POST>
選擇圖片文件: 〈INPUT NAME="image" TYPE="file">
〈INPUT TYPE="submit" VALUE="Send File">
〈/FORM>
〈/BODY>
〈/HTML>
upload.php3:處理上傳后的圖片文件
〈html>
〈head>
〈title>處理〈/title>
〈/head>
〈body>
〈?
$flag = "true";
if(isset($image) && $image &&
????????($image_type = "image/gif" || $image_type = "image/png"
????????????????|| $image_type = "image/pjpeg")){???????//判斷上載文件的格式等
????????$dest_image = "./images/".$image_name;
????????if(@copy($image,$dest_image)){??//拷貝上載文件到images目錄下
???????????$small_image = "./images/small".$image_name;
???????????$exec_str = "/usr/bin/X11/convert -geometry 100x100 ".$dest_image." ".$small_image;?????????????
???????????@exec($exec_str);???????//進(jìn)行圖像的縮放
????????}else
????????????????$flag = "false";
}else{
????????
????????$flag = "false";
}
if( $flag == "false"){
????????echo "error〈p>";
????????echo "〈a href=\"uploadform.html\">重新上載〈/a>";
}else{
????????echo "〈image src=\"$small_image\">";
????????echo "〈image src=\"./images/$image_name\">";
}???????
?>
〈/body>
〈/html>
如果結(jié)合GetImageSize函數(shù),我們還可以控制縮放的大小。結(jié)合數(shù)據(jù)庫(kù)可以對(duì)圖片文件進(jìn)行索引或者存儲(chǔ)等。
ImageMagick的功能是很強(qiáng)大的,不僅能對(duì)圖片文件進(jìn)行縮放,還有進(jìn)行翻轉(zhuǎn)、格式轉(zhuǎn)化等等功能。
讀者可以自己參看ImageMagick的幫助文件。

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