No orientation in exif data - loading image from PHP
tried to detect the image orientation of downloaded images from iPhone and then adjust their orientation.
I am trying to fix an issue where images taken in a potrait are loaded with a rotation of -90 degrees. I tried a lot of switch statements that didn't work, so decided to return the exif data in my JSON return.
The problem I see is that they are not orientation in exif data.
I am doing this:
$imagefile = $fileToUpload["tmp_name"];
$destinationImage = imagecreatefromstring(file_get_contents($imagefile));
$exif = exif_read_data($imagefile);
$moveUploadedFile = imagejpeg($destinationImage, $this->uploadDir . "/" . $newFileName, 100);
imagedestroy($destinationImage);
if ($moveUploadedFile) {
$return['ort'] = $exif;
echo json_encode($return);
}
What I see in my return (using firebug) is:
FileName:"phpUQZFHh"
FileDateTime:1410465904
FileSize:473421
FileType:2
MimeType:"image/jpeg"
SectionsFound:"COMMENT"
Computed: OBJECT:
Height:700
Width:933
IsColor:1
Comment: ARRAY:
0:"CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 100"
I want to use exif data like this:
if (!empty($exif['Orientation'])){
//get the orientation
$ort = $exif['Orientation'];
//determine what oreientation the image was taken at
switch($ort){
case 2: // horizontal flip
break;
case 3: // 180 rotate left
$destinationImage = imagerotate($destinationImage, 180, -1);
break;
}
}
Any help?
EDIT: After loading the uploaded image and checking its properties, it appears that all exif data has been removed during the upload process.
It still puzzles me why it spins before / at boot time / how to fix it.
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I faced the same problem. It turns out that some images don't really have any exif data at Orientation
all - usually those with the "correct" orientation don't have it. I tried one album made with iPhone and it was.
In your case, the photos may not have had any exif data. I also had some photos (rotated 90 degrees, but no Orientation
info). I could be wrong, but without exif data, there is no programmatic way to tell if the image is oriented incorrectly.
For misdirected photos without Orientation
info, I suggest you just make sure the user sees (gets a preview) of what will be loaded. IME, most users are more than willing to go out of their way to run paint / photoshop / etc. just to make sure they have beautiful photos.
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