drrqwokuz71031449 2010-11-24 12:17
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如何根据EXIF'方向'数据停止PHP iMagick自动旋转图像

Currently working with PHP and iMagick to develop a poster printing Web application.

This is the example image I am using to test upload/image editing features of the application:

alt text

The image contains the following EXIF data:

[FileName] => 1290599108_IMG_6783.JPG
    [FileDateTime] => 1290599109
    [FileSize] => 4275563
    [FileType] => 2
    [MimeType] => image/jpeg
    [SectionsFound] => ANY_TAG, IFD0, THUMBNAIL, EXIF, INTEROP, MAKERNOTE
    [COMPUTED] => Array
        (
            [html] => width="3504" height="2336"
            [Height] => 2336
            [Width] => 3504
            [IsColor] => 1
            [ByteOrderMotorola] => 0
            [CCDWidth] => 22mm
            [ApertureFNumber] => f/5.6
            [UserComment] => 
            [UserCommentEncoding] => UNDEFINED
            [Thumbnail.FileType] => 2
            [Thumbnail.MimeType] => image/jpeg
        )

    [Make] => Canon
    [Model] => Canon EOS 30D
    [Orientation] => 6
    [XResolution] => 72/1
    [YResolution] => 72/1
    [ResolutionUnit] => 2
    [DateTime] => 2009:08:31 08:23:49
    [YCbCrPositioning] => 2
    [Exif_IFD_Pointer] => 196

However - iMagick, when __construct'ed with this image, automatically rotates it an additional 90 degrees CCW as per [Orientation] => 6 (I think!). Resulting in this...

alt text

What I'd like to know is...

How can I maintain the original orientation of the image seen at the top of the page? And is this possible through disabling the auto-rotation performed by iMagick?

Many thanks

UPDATE: Here's the solution I've come up with... It will fix the orientation based on the orientation in the EXIF data

   public function fixOrientation() {

       $exif = exif_read_data($this->imgSrc);
       $orientation = $exif['Orientation'];
       switch($orientation) {

           case 6: // rotate 90 degrees CW
               $this->image->rotateimage("#FFF", 90);
           break;

           case 8: // rotate 90 degrees CCW
              $this->image->rotateimage("#FFF", -90);
           break;

       }

 }
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  • duanaidang6197 2010-11-24 13:36
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