我创建了一个网络应用,用户可以上传他们的个人资料图片。如果用户使用移动相机拍摄图像,则方向会发生变化。我设法使用以下代码解决它:
$path[0] = $_FILES['image_upload_file']['tmp_name'];
$exif = exif_read_data($path[0]);
// $exif['Orientation'] = 6;
if(isset($exif['Orientation'])){
$image = imagecreatefromjpeg($path[0]);
file_put_contents("img_data.txt",print_r($image,true));
$ort = $exif['Orientation'];
switch($ort)
{
case 3: // 180 rotate left
$image = imagerotate($image, 180,0);
break;
case 6: // 90 rotate right
file_put_contents("img_before.txt",print_r($exif,true));
$image = imagerotate($image, -90, 0);
file_put_contents("img_after.txt",print_r($ort,true));
break;
case 8: // 90 rotate left
$image = imagerotate($image, 90, 0);
break;
}
imagejpeg($image, $path[0], 90);
}
从[{3}}
获取此代码但是,它仅适用于从Android设备或计算机捕获图像的情况。如果从iPhone设备捕获图像,则无效。
在调试时,我注意到$image = imagerotate($image, -90, 0);
与iphone存在一些问题。
我可以肯定地说这是因为这行没有被执行(因为img_after.txt没有被创建它应该被创建的地方)。
file_put_contents("img_after.txt",print_r($ort,true));
请建议!
更新:
从 iPhone
中读取的exif数据Array
(
[FileName] => phpYBaC5W
[FileDateTime] => 1467207697
[FileSize] => 1430214
[FileType] => 2
[MimeType] => image/jpeg
[SectionsFound] => ANY_TAG, IFD0, EXIF
[COMPUTED] => Array
(
[html] => width="3264" height="2448"
[Height] => 2448
[Width] => 3264
[IsColor] => 1
[ByteOrderMotorola] => 1
)
[Orientation] => 6
[Exif_IFD_Pointer] => 38
[ColorSpace] => 1
[ExifImageWidth] => 3264
[ExifImageLength] => 2448
)
exif数据来自 Android :
Array
(
[FileName] => phpMQHUgW
[FileDateTime] => 1467207789
[FileSize] => 1842753
[FileType] => 2
[MimeType] => image/jpeg
[SectionsFound] => ANY_TAG, IFD0, THUMBNAIL, EXIF, GPS, INTEROP
[COMPUTED] => Array
(
[html] => width="3264" height="1836"
[Height] => 1836
[Width] => 3264
[IsColor] => 1
[ByteOrderMotorola] => 0
[ApertureFNumber] => f/2.4
[Thumbnail.FileType] => 2
[Thumbnail.MimeType] => image/jpeg
[Thumbnail.Height] => 288
[Thumbnail.Width] => 512
)
[ImageWidth] => 3264
[ImageLength] => 1836
[Make] => SAMSUNG
[Model] => SM-G7102
[Orientation] => 6
[XResolution] => 72/1
[YResolution] => 72/1
[ResolutionUnit] => 2
[Software] => G7102DDUBOB1
[DateTime] => 2016:06:29 19:12:59
[YCbCrPositioning] => 1
[Exif_IFD_Pointer] => 238
[GPS_IFD_Pointer] => 870
[THUMBNAIL] => Array
(
[ImageWidth] => 512
[ImageLength] => 288
[Compression] => 6
[Orientation] => 6
[XResolution] => 72/1
[YResolution] => 72/1
[ResolutionUnit] => 2
[JPEGInterchangeFormat] => 1018
[JPEGInterchangeFormatLength] => 5829
)
[ExposureTime] => 1/17
[FNumber] => 240/100
[ExposureProgram] => 2
[ISOSpeedRatings] => 1000
[ExifVersion] => 0220
[DateTimeOriginal] => 2016:06:29 19:12:59
[DateTimeDigitized] => 2016:06:29 19:12:59
[ComponentsConfiguration] =>
[ShutterSpeedValue] => 405/100
[ApertureValue] => 252/100
[BrightnessValue] => -169/100
[ExposureBiasValue] => 0/10
[MaxApertureValue] => 253/100
[MeteringMode] => 2
[LightSource] => 0
[Flash] => 0
[FocalLength] => 293/100
[MakerNote] => 0100 Z @ P
[FlashPixVersion] => 0100
[ColorSpace] => 1
[ExifImageWidth] => 3264
[ExifImageLength] => 1836
[InteroperabilityOffset] => 840
[SensingMethod] => 2
[SceneType] =>
[ExposureMode] => 0
[WhiteBalance] => 0
[FocalLengthIn35mmFilm] => 31
[SceneCaptureType] => 0
[ImageUniqueID] => E08QLGI01CH
[GPSVersion] =>
[InterOperabilityIndex] => R98
[InterOperabilityVersion] => 0100
)
如果我跳过代码来旋转图像,它可以在包括iphone在内的所有手机中正常工作。
答案 0 :(得分:0)
这是一个"功能"通过从文件中剥离EXIF数据来保护隐私,或者在上传图像时至少相当一部分。
曾经有一个hack,您可以从Javascript获取该数据并将其传递给您的后端,但这似乎不再是这种情况。
我不再是iPhone用户了,但是有一些猜测和报道已经在新版本的iOS中得到修复,但是仍然存在这样的问题:用户群的很大一部分可能会无法为您提供该数据。
这里有一个冗长的主题,你可能想读: Image upload from iphone strips exif data