这是我用来调整图像大小的脚本。
我的问题是这个脚本会生成负片（比如负片[只有 .png 文件]）。哪里/什么问题？
我使用 GD 库重新调整图像大小，但得到了相同的结果。
$dir = "../images/sliderimages/";
$photo = $_FILES['slid_image_upload']['name'];
$tmp_name = $_FILES['slid_image_upload']['tmp_name'];
$filename = $dir.$photo;
$dir_thm = "../images/thm_sliderimages/";
$thm_filename = $dir_thm.'thm_'.$photo;
/************Resizing the image***************/
$size = getimagesize($tmp_name);
$width = $size[0];
$height = $size[1];
$newheight = 200;
$newwidth = 420;
$newheight_thm = 50;
$newwidth_thm = 80;
$tmp=imagecreatetruecolor($newwidth,$newheight);
$tmp_thm=imagecreatetruecolor($newwidth_thm, $newheight_thm);
if($size[2] == IMAGETYPE_GIF)
{
$src = imagecreatefromgif($tmp_name);
imagecopyresampled($tmp,$src, 0,0,0,0, $newwidth, $newheight, $width, $height);
imagecopyresampled($tmp_thm, $src, 0,0,0,0, $newwidth_thm, $newheight_thm, $width, $height);
imagegif($tmp,$filename,100);
imagegif($tmp_thm,$thm_filename,100);
}
elseif($size[2] == IMAGETYPE_JPEG)
{
$src = imagecreatefromjpeg($tmp_name);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
imagecopyresampled($tmp_thm, $src, 0,0,0,0, $newwidth_thm, $newheight_thm, $width, $height);
imagejpeg($tmp,$filename,100);
imagejpeg($tmp_thm,$thm_filename,100);
}
elseif($size[2] == IMAGETYPE_PNG)
{
$src = imagecreatefrompng($tmp_name);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
imagecopyresampled($tmp_thm, $src, 0,0,0,0, $newwidth_thm, $newheight_thm, $width, $height);
imagepng($tmp,$filename,9);
imagepng($tmp_thm,$thm_filename,9);
}
imagedestroy($src);
imagedestroy($tmp);