PHP read_exif_data和调整方向
PHP read_exif_data和调整方向
提问于 2011-09-21 02:11:33
我使用以下代码来旋转上传的jpeg图像，如果方向是关闭的。我只有从iPhones和安卓上传的图片有问题。
if(move_uploaded_file($_FILES['photo']['tmp_name'], $upload_path . $newfilename)){
chmod($upload_path . $newfilename, 0755);
$exif = exif_read_data($upload_path . $newfilename);
$ort = $exif['IFD0']['Orientation'];
switch($ort)
{
case 3: // 180 rotate left
$image->imagerotate($upload_path . $newfilename, 180, -1);
break;
case 6: // 90 rotate right
$image->imagerotate($upload_path . $newfilename, -90, -1);
break;
case 8: // 90 rotate left
$image->imagerotate($upload_path . $newfilename, 90, -1);
break;
}
imagejpeg($image, $upload_path . $newfilename, 100);
$success_message = 'Photo Successfully Uploaded';
}else{
$error_count++;
$error_message = 'Error: Upload Unsuccessful<br />Please Try Again';
}我从jpeg中读取EXIF数据的方式有问题吗？它没有像预期的那样旋转图像。
这就是我运行var_dump($exif)时发生的事情；
array(41) {
["FileName"]=> string(36) "126e7c0efcac2b76b3320e6187d03cfd.JPG"
["FileDateTime"]=> int(1316545667)
["FileSize"]=> int(1312472)
["FileType"]=> int(2)
["MimeType"]=> string(10) "image/jpeg"
["SectionsFound"]=> string(30) "ANY_TAG, IFD0, THUMBNAIL, EXIF"
["COMPUTED"]=> array(8) {
["html"]=> string(26) "width="2048" height="1536""
["Height"]=> int(1536)
["Width"]=> int(2048)
["IsColor"]=> int(1)
["ByteOrderMotorola"]=> int(1)
["ApertureFNumber"]=> string(5) "f/2.8"
["Thumbnail.FileType"]=> int(2)
["Thumbnail.MimeType"]=> string(10) "image/jpeg" }
["Make"]=> string(5) "Apple"
["Model"]=> string(10) "iPhone 3GS"
["Orientation"]=> int(6)
["XResolution"]=> string(4) "72/1"
["YResolution"]=> string(4) "72/1" ["ResolutionUnit"]=> int(2) ["Software"]=> string(5) "4.3.5" ["DateTime"]=> string(19) "2011:09:16 21:18:46" ["YCbCrPositioning"]=> int(1) ["Exif_IFD_Pointer"]=> int(194) ["THUMBNAIL"]=> array(6) { ["Compression"]=> int(6) ["XResolution"]=> string(4) "72/1" ["YResolution"]=> string(4) "72/1" ["ResolutionUnit"]=> int(2) ["JPEGInterchangeFormat"]=> int(658) ["JPEGInterchangeFormatLength"]=> int(8231) } ["ExposureTime"]=> string(4) "1/15" ["FNumber"]=> string(4) "14/5" ["ExposureProgram"]=> int(2) ["ISOSpeedRatings"]=> int(200) ["ExifVersion"]=> string(4) "0221" ["DateTimeOriginal"]=> string(19) "2011:09:16 21:18:46" ["DateTimeDigitized"]=> string(19) "2011:09:16 21:18:46" ["ComponentsConfiguration"]=> string(4) "" ["ShutterSpeedValue"]=> string(8) "3711/949" ["ApertureValue"]=> string(9) "4281/1441" ["MeteringMode"]=> int(1) ["Flash"]=> int(32) ["FocalLength"]=> string(5) "77/20" ["SubjectLocation"]=> array(4) { [0]=> int(1023) [1]=> int(767) [2]=> int(614) [3]=> int(614) } ["FlashPixVersion"]=> string(4) "0100" ["ColorSpace"]=> int(1) ["ExifImageWidth"]=> int(2048) ["ExifImageLength"]=> int(1536) ["SensingMethod"]=> int(2) ["ExposureMode"]=> int(0) ["WhiteBalance"]=> int(0) ["SceneCaptureType"]=> int(0) ["Sharpness"]=> int(1) }回答 11
Stack Overflow用户
发布于 2012-12-20 09:04:58
基于Daniel的代码，我编写了一个函数，可以在必要时简单地旋转图像，而不需要重新采样。
GD
function image_fix_orientation(&$image, $filename) {
$exif = exif_read_data($filename);
if (!empty($exif['Orientation'])) {
switch ($exif['Orientation']) {
case 3:
$image = imagerotate($image, 180, 0);
break;
case 6:
$image = imagerotate($image, 90, 0);
break;
case 8:
$image = imagerotate($image, -90, 0);
break;
}
}
}单行版本(GD)
function image_fix_orientation(&$image, $filename) {
$image = imagerotate($image, array_values([0, 0, 0, 180, 0, 0, -90, 0, 90])[@exif_read_data($filename)['Orientation'] ?: 0], 0);
}ImageMagick
function image_fix_orientation($image) {
if (method_exists($image, 'getImageProperty')) {
$orientation = $image->getImageProperty('exif:Orientation');
} else {
$filename = $image->getImageFilename();
if (empty($filename)) {
$filename = 'data://image/jpeg;base64,' . base64_encode($image->getImageBlob());
}
$exif = exif_read_data($filename);
$orientation = isset($exif['Orientation']) ? $exif['Orientation'] : null;
}
if (!empty($orientation)) {
switch ($orientation) {
case 3:
$image->rotateImage('#000000', 180);
break;
case 6:
$image->rotateImage('#000000', 90);
break;
case 8:
$image->rotateImage('#000000', -90);
break;
}
}
}Stack Overflow用户
发布于 2014-02-15 20:40:07
对于那些上传图像的人来说更简单的功能，它只是在必要时自动旋转。
function image_fix_orientation($filename) {
$exif = exif_read_data($filename);
if (!empty($exif['Orientation'])) {
$image = imagecreatefromjpeg($filename);
switch ($exif['Orientation']) {
case 3:
$image = imagerotate($image, 180, 0);
break;
case 6:
$image = imagerotate($image, 90, 0);
break;
case 8:
$image = imagerotate($image, -90, 0);
break;
}
imagejpeg($image, $filename, 90);
}
}Stack Overflow用户
发布于 2018-12-10 06:46:16
为什么没有人考虑镜像案例2、4、5、7？在exif定位领域，还有4个案例：
以下是采用文件名的完整解决方案：
function __image_orientate($source, $quality = 90, $destination = null)
{
if ($destination === null) {
$destination = $source;
}
$info = getimagesize($source);
if ($info['mime'] === 'image/jpeg') {
$exif = exif_read_data($source);
if (!empty($exif['Orientation']) && in_array($exif['Orientation'], [2, 3, 4, 5, 6, 7, 8])) {
$image = imagecreatefromjpeg($source);
if (in_array($exif['Orientation'], [3, 4])) {
$image = imagerotate($image, 180, 0);
}
if (in_array($exif['Orientation'], [5, 6])) {
$image = imagerotate($image, -90, 0);
}
if (in_array($exif['Orientation'], [7, 8])) {
$image = imagerotate($image, 90, 0);
}
if (in_array($exif['Orientation'], [2, 5, 7, 4])) {
imageflip($image, IMG_FLIP_HORIZONTAL);
}
imagejpeg($image, $destination, $quality);
}
}
return true;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/7489742
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