我正在使用一个功能来调整图片大小。
大多数图片都调整得非常好。 但有人，我不是为什么只是黑人。 相同的图片总是给出黑色结果。 可能是Jpeg给出了这种......但是如何改变呢？
谢谢！
function create_image($file) {
if(is_file($file)) {
$size = getimagesize($file);
// y =hauteur en pixel
$y = 800;
$x = $size[0]/$size[1]*$y;
//$y = 75; # Taille en pixel de l'image redimensionnée
if ($size) {
if ($size['mime']=='image/jpeg' ) {
$img_big = imagecreatefromjpeg($file);
$img_new = imagecreate($x, $y);
# création de la miniature
$img_mini = imagecreatetruecolor($x, $y)
or $img_mini = imagecreate($x, $y);
// copie de l'image, avec le redimensionnement.
imagecopyresized($img_mini,$img_big,0,0,0,0,$x,$y,$size[0],$size[1]);
imagejpeg($img_mini,$file );
}
elseif ($size['mime']=='image/png' ) {
$img_big = imagecreatefrompng($file);
$img_new = imagecreate($x, $y);
# création de la miniature
$img_mini = imagecreatetruecolor($x, $y)
or $img_mini = imagecreate($x, $y);
// copie de l'image, avec le redimensionnement.
imagecopyresized($img_mini,$img_big,0,0,0,0,$x,$y,$size[0],$size[1]);
imagepng($img_mini,$file );
}
elseif ($size['mime']=='image/gif' ) {
$img_big = imagecreatefromgif($file);
$img_new = imagecreate($x, $y);
# création de la miniature
$img_mini = imagecreatetruecolor($x, $y)
or $img_mini = imagecreate($x, $y);
// copie de l'image, avec le redimensionnement.
imagecopyresized($img_mini,$img_big,0,0,0,0,$x,$y,$size[0],$size[1]);
imagegif($img_mini,$file );
}
// move_uploaded_file($img_mini,$dir."test");
}
return true;
} else {
return false;
}
}
编辑： 谢谢！
优化很好......
但结果与图像相同： http://www.ericae.fr/test_images/Ripper.jpg 调整大小给出：http://www.ericae.fr/test_images/resized.jpg 全黑:(
对于其他人的图像，效果很好!!! 我测试了大约25个图像只有2个问题... 为什么????
答案 0 :(得分：0)
我决定检查你的代码。当你可以做一次时，为什么多次使用相同的程序？
另外，我建议使用imagecopyresampled代替imagecopyresized，它会在没有黑屏的情况下为您提供更好的结果。
看看这个，我评论了我为你改变的一切：
function create_image($file)
{
if(is_file($file))
{
$size = getimagesize($file);
if ($size)
{
$y = 800;
$x = $size[0]/$size[1]*$y;
$mime = $size['mime'];
// Detect image format and create a GD resource
switch ($mime)
{
case 'image/jpeg' : $img_big = imagecreatefromjpeg($file); break;
case 'image/png' : $img_big = imagecreatefrompng($file); break;
case 'image/gif' : $img_big = imagecreatefromgif($file); break;
// Wrong type - exiting
default: return false;
}
// Create a new image for resizing
$img_mini = imagecreatetruecolor($x, $y);
// This function is better for image resizing than imagecopyresized
// Gives you better quality and no black screens
imagecopyresampled($img_mini,$img_big,0,0,0,0,$x,$y,$size[0],$size[1]);
// OK, now we ready to save your image!
// We will save it in the same format as original
switch ($mime)
{
case 'image/jpeg' : $img_big = imagejpeg($img_mini, $file); break;
case 'image/png' : $img_big = imagepng($img_mini, $file); break;
case 'image/gif' : $img_big = imagegif($img_mini, $file); break;
default: return false;
}
// Don't forget to free memory.
imagedestroy($img_big); imagedestroy($img_mini);
return true;
// Don't do this. It's wrong.
// move_uploaded_file($img_mini,$dir."test");
}
// didn't get size
else
return false;
} // isn't a file
else
return false;
}
我希望它对你有用：3
答案 1 :(得分：0)
使用此文件重新调整图像大小
有一点需要注意 - 它可能不支持gif。启用GD库。
用法
<img src="resizeImage.php?w=x&h=z&img=path/to/image" border="0'>
这是图像大小调整文件：resizeImage.php
<?php
header ("Content-type: image/jpeg");
/*
JPEG / PNG Image Resizer
Parameters (passed via URL):
img = path / url of jpeg or png image file
percent = if this is defined, image is resized by it's
value in percent (i.e. 50 to divide by 50 percent)
w = image width
h = image height
constrain = if this is parameter is passed and w and h are set
to a size value then the size of the resulting image
is constrained by whichever dimension is smaller
Requires the PHP GD Extension
Outputs the resulting image in JPEG Format
*/
$img = $_GET['img'];
$percent = $_GET['percent'];
$constrain = $_GET['constrain'];
$w = $_GET['w'];
$h = $_GET['h'];
// get image size of img
$x = @getimagesize($img);
// image width
$sw = $x[0];
// image height
$sh = $x[1];
if ($percent > 0) {
// calculate resized height and width if percent is defined
$percent = $percent * 0.01;
$w = $sw * $percent;
$h = $sh * $percent;
} else {
if (isset ($w) AND !isset ($h)) {
// autocompute height if only width is set
$h = (100 / ($sw / $w)) * .01;
$h = @round ($sh * $h);
} elseif (isset ($h) AND !isset ($w)) {
// autocompute width if only height is set
$w = (100 / ($sh / $h)) * .01;
$w = @round ($sw * $w);
} elseif (isset ($h) AND isset ($w) AND isset ($constrain)) {
// get the smaller resulting image dimension if both height
// and width are set and $constrain is also set
$hx = (100 / ($sw / $w)) * .01;
$hx = @round ($sh * $hx);
$wx = (100 / ($sh / $h)) * .01;
$wx = @round ($sw * $wx);
if ($hx < $h) {
$h = (100 / ($sw / $w)) * .01;
$h = @round ($sh * $h);
} else {
$w = (100 / ($sh / $h)) * .01;
$w = @round ($sw * $w);
}
}
}
$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image
$im = @ImageCreateFromPNG ($img) or // or PNG Image
$im = @ImageCreateFromGIF ($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF
if (!$im) {
// We get errors from PHP's ImageCreate functions...
// So let's echo back the contents of the actual image.
readfile ($img);
} else {
// Create the resized image destination
$thumb = @ImageCreateTrueColor ($w, $h);
// Copy from image source, resize it, and paste to image destination
@ImageCopyResampled ($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh);
// Output resized image
@ImageJPEG ($thumb);
}
?>