PHP图像调整大小脚本旋转从iPhone Camera上传的图像
以下脚本旋转肖像图像。如何更改它以保持方向（不旋转，只调整大小）？
更新 使用相机使用iPhone上传时，脚本仅旋转纵向图像。使用iPhone从库上传的纵向图像不会旋转，上传到桌面上的纵向图像不会旋转。
上传前预览
如果上面预览的图像是从iPhone相机上传的话，调整大小后的图像（参见下面的PHP和类）
调整大小后的图像如果上面预览的图像是从iPhone库上传的（通过相机以与上面相同的方式拍摄）
PHP
include("classes/resize.class.php");
// *** 1) Initialise / load image
$resizeObj = new resize($fileLocation);
$resizeObj -> resizeImage(320, 320, 'crop');
$resizeObj -> saveImage($fileLocationSq, 100);
类
<?php
class resize
{
// *** Class variables
private $image;
private $width;
private $height;
private $imageResized;
function __construct($fileName)
{
// *** Open up the file
$this->image = $this->openImage($fileName);
// *** Get width and height
$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
}
## --------------------------------------------------------
private function openImage($file)
{
// *** Get extension
$extension = strtolower(strrchr($file, '.'));
switch($extension)
{
case '.jpg':
case '.jpeg':
$img = @imagecreatefromjpeg($file);
break;
case '.gif':
$img = @imagecreatefromgif($file);
break;
case '.png':
$img = @imagecreatefrompng($file);
break;
default:
$img = false;
break;
}
return $img;
}
## --------------------------------------------------------
public function resizeImage($newWidth, $newHeight, $option="auto")
{
// *** Get optimal width and height - based on $option
$optionArray = $this->getDimensions($newWidth, $newHeight, $option);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
// *** Resample - create image canvas of x, y size
$this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);
// *** if option is 'crop', then crop too
if ($option == 'crop') {
$this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
return 'ok';
}
}
## --------------------------------------------------------
private function getDimensions($newWidth, $newHeight, $option)
{
switch ($option)
{
case 'exact':
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
break;
case 'portrait':
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
break;
case 'landscape':
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
break;
case 'auto':
$optionArray = $this->getSizeByAuto($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
case 'crop':
$optionArray = $this->getOptimalCrop($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function getSizeByFixedHeight($newHeight)
{
$ratio = $this->width / $this->height;
$newWidth = $newHeight * $ratio;
return $newWidth;
}
private function getSizeByFixedWidth($newWidth)
{
$ratio = $this->height / $this->width;
$newHeight = $newWidth * $ratio;
return $newHeight;
}
private function getSizeByAuto($newWidth, $newHeight)
{
if ($this->height < $this->width)
// *** Image to be resized is wider (landscape)
{
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
}
elseif ($this->height > $this->width)
// *** Image to be resized is taller (portrait)
{
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
}
else
// *** Image to be resizerd is a square
{
if ($newHeight < $newWidth) {
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
} else if ($newHeight > $newWidth) {
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
} else {
// *** Sqaure being resized to a square
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
}
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function getOptimalCrop($newWidth, $newHeight)
{
$heightRatio = $this->height / $newHeight;
$widthRatio = $this->width / $newWidth;
if ($heightRatio < $widthRatio) {
$optimalRatio = $heightRatio;
} else {
$optimalRatio = $widthRatio;
}
$optimalHeight = $this->height / $optimalRatio;
$optimalWidth = $this->width / $optimalRatio;
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
{
// *** Find center - this will be used for the crop
$cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
$cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );
$crop = $this->imageResized;
//imagedestroy($this->imageResized);
// *** Now crop from center to exact requested size
$this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
}
## --------------------------------------------------------
public function saveImage($savePath, $imageQuality="100")
{
// *** Get extension
$extension = strrchr($savePath, '.');
$extension = strtolower($extension);
switch($extension)
{
case '.jpg':
case '.jpeg':
if (imagetypes() & IMG_JPG) {
imagejpeg($this->imageResized, $savePath, $imageQuality);
}
break;
case '.gif':
if (imagetypes() & IMG_GIF) {
imagegif($this->imageResized, $savePath);
}
break;
case '.png':
// *** Scale quality from 0-100 to 0-9
$scaleQuality = round(($imageQuality/100) * 9);
// *** Invert quality setting as 0 is best, not 9
$invertScaleQuality = 9 - $scaleQuality;
if (imagetypes() & IMG_PNG) {
imagepng($this->imageResized, $savePath, $invertScaleQuality);
}
break;
// ... etc
default:
// *** No extension - No save.
break;
}
imagedestroy($this->imageResized);
}
## --------------------------------------------------------
}
?>
2 个答案:
答案 0 :(得分：2)
图像可以包含有关方向（=横向或纵向）的额外信息。参见：
http://www.impulseadventure.com/photo/exif-orientation.html
这可以解释你的问题。如果你看看：
http://php.net/manual/en/function.imagecreatefromjpeg.php
然后你可以在评论中找到这个：
此功能不支持EXIF方向数据。图片那个 使用EXIF旋转，之后将以原始方向显示 由imagecreatefromjpeg（）处理。下面是一个要创建的功能 来自JPEG的图像，同时尊重EXIF方向数据。
以及如何纠正它：
function imagecreatefromjpegexif($filename)
{
$img = imagecreatefromjpeg($filename);
$exif = exif_read_data($filename);
if ($img && $exif && isset($exif['Orientation']))
{
$ort = $exif['Orientation'];
if ($ort == 6 || $ort == 5)
$img = imagerotate($img, 270, null);
if ($ort == 3 || $ort == 4)
$img = imagerotate($img, 180, null);
if ($ort == 8 || $ort == 7)
$img = imagerotate($img, 90, null);
if ($ort == 5 || $ort == 4 || $ort == 7)
imageflip($img, IMG_FLIP_HORIZONTAL);
}
return $img;
}
答案 1 :(得分：0)
KIKO Software的答案非常好，但我想补充一点。 exif_read_data 并非总是在所有计算机上都可用，因此请在使用前更好地检查它是否可用。此外，它会产生一些不需要的输出，所以最好用@：
作为前缀 if(function_exists('exif_read_data'))
{
$exif = @exif_read_data($filename);
}
else
{
return $img;
}
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