使用php將圖像批處理文件夾變成灰度

Question

任何人都可以在這裏找到我要去的地方。它應該在一個文件夾中創建圖像的灰度副本並將其保存在另一個文件夾中。這可能與我引用文件位置的方式有關。兩個文件夾上的文件夾權限均爲777.腳本運行時沒有可見的錯誤，但沒有創建圖像。

function grayscalecopy($targetfile, $outputfile){ 
$size = GetImageSize($targetfile); 
$width = $size[1]; 
$height = $size[0]; 
$canvas = imagecreatetruecolor($width, $height); 
$sourceimage = imagecreatefromjpeg($targetfile); 
imagefilter($sourceimage, IMG_FILTER_GRAYSCALE); 
imagecopy($canvas, $sourceimage, 0, 0, 0, 0, $width, $height); 
imagejpeg($canvas, $outputfile, 95); 
imagedestroy($sourceimage); 
imagedestroy($canvas); 
echo "Converted ".$targetfile." to grayscale as ".$outputfile." ".$width."x".$height."<br/>"; 
} 

$serverfiles = glob("artworkimages/thumbs/*.*"); 
//$numbertocache = count($serverfiles); 
$numbertocache = 10; 
for ($i=0; $i<$numbertocache; $i++) 
{ 
    $serverfilesshort=explode("/",$serverfiles[$i]); 
    $serverfilesshort=$serverfilesshort[count($serverfilesshort)-1]; 
    grayscalecopy($serverfiles[$i], "artworkimages/thumbs/grays/".$serverfilesshort); 
} 

Answer 1

檢查imagejpeg呼叫的結果。將您的代碼更改爲：

$result = imagejpeg($canvas, $outputfile, 95); 
if($result) 
{ 
    echo "Converted ".$targetfile." to grayscale as ".$outputfile." ".$width."x".$height."<br/>"; 
} 
else 
{ 
    echo "Could not save to $outputfile.<br>" 
    if(!is_writable($outputfile) 
     echo "The path was not writable"; 
} 
imagedestroy($sourceimage); 
imagedestroy($canvas); 

這將幫助我們瞭解發生了什麼。如果您得到「路徑不可寫」，請嘗試使用絕對路徑代替相對路徑，例如：

grayscalecopy($serverfiles[$i], dirname(__FILE__)."/artworkimages/thumbs/grays/".$serverfilesshort);