Question

This function is creating some random black images like.. 10% of the time, is not much, but.. you know.. shouldnt be happening.

class ImgResizer {
private $originalFile =   ;
public function __construct($originalFile =   ) {
    $this -> originalFile = $originalFile;
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public function resize($newWidth, $targetFile) {
    if (empty($newWidth) || empty($targetFile)) {
        return false;
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    $src = imagecreatefromjpeg($this -> originalFile);
    list($width, $height) = getimagesize($this -> originalFile);
    $newHeight = ($height / $width) * $newWidth;

    if ($newHeight< 335 ) {
        //$newHeight= 335 ;
    iii
    $tmp = imagecreatetruecolor($newWidth, $newHeight);
    #$tmp = imagecreate($newWidth, $newHeight);
    imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
    if (file_exists($targetFile)) {
        unlink($targetFile);
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    imagejpeg($tmp, $targetFile, 85); // 85 is my choice, make it between 0 – 100 for output image quality with 100 being the most luxurious
iii

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错误表示不出任何错误。此处为:

Array(
[GD Version] => bundled (2.0.34 compatible)
[FreeType Support] => 
[T1Lib Support] => 
[GIF Read Support] => 1
[GIF Create Support] => 1
[JPG Support] => 1
[PNG Support] => 1
[WBMP Support] => 1
[XPM Support] => 1
[XBM Support] => 1
[JIS-mapped Japanese Font Support] => )1

server is linux. function is being called like this: assuming $imagen is the actual source image, and $imagendestino is the path and filename of the new thumbnail.

if (!file_exists($imagendestino)) {
        $work = new ImgResizer($imagen);
        $work -> resize(475, $imagendestino);
    iii

提前感谢!

Answer 1

很可能是你通过一个非联合项目图像。

一个联合项目是再造的罚款,但是由于这一功能可以读到不同的图像格式,因此产生了一种无效的形象。结果是一片空白的形象,即所有零点,这显示了黑形象。设立

imagecreatetruecolor($newWidth, $newHeight);

当我跑过你时,我把一个PNG图像文件传给他们Warnings,并树立了一个黑形象:

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]:  filename  is not a valid JPEG file
Warning: imagecopyresampled(): supplied argument is not a valid Image resource

很可能,你会发出警告,这样你不会得到这些信息。

审判

imagecreatefromstring(file_get_contents(filename))

而不是

imagecreatefromjpeg(filename)

这样,GD就自动发现根据您的档案负责人的档案类型。

友情链接