问题:

Canon DSLRs appear to save photos in landscape orientation and uses exif::orientation to do the rotation.

Question: How can imagemagick be used to re-save the image into the intended orientation using the exif orientation data such that it no longer requires the exif data to display in the correct orientation?

回答1:

You could use the auto-orient option of convert to do this.

convert your-image.jpg -auto-orient output.jpg

回答2:

The PHP Imagick way would be to test the image orientation and rotate/flip the image accordingly:

function autorotate(Imagick $image) {     switch ($image->getImageOrientation()) {     case Imagick::ORIENTATION_TOPLEFT:         break;     case Imagick::ORIENTATION_TOPRIGHT:         $image->flopImage();         break;     case Imagick::ORIENTATION_BOTTOMRIGHT:         $image->rotateImage("#000", 180);         break;     case Imagick::ORIENTATION_BOTTOMLEFT:         $image->flopImage();         $image->rotateImage("#000", 180);         break;     case Imagick::ORIENTATION_LEFTTOP:         $image->flopImage();         $image->rotateImage("#000", -90);         break;     case Imagick::ORIENTATION_RIGHTTOP:         $image->rotateImage("#000", 90);         break;     case Imagick::ORIENTATION_RIGHTBOTTOM:         $image->flopImage();         $image->rotateImage("#000", 90);         break;     case Imagick::ORIENTATION_LEFTBOTTOM:         $image->rotateImage("#000", -90);         break;     default: // Invalid orientation         break;     }     $image->setImageOrientation(Imagick::ORIENTATION_TOPLEFT);     return $image; }

The function might be used like this:

$img = new Imagick('/path/to/file'); autorotate($img); $img->stripImage(); // if you want to get rid of all EXIF data $img->writeImage();

转载请标明出处:Detect EXIF Orientation and Rotate Image using ImageMagick

文章来源: Detect EXIF Orientation and Rotate Image using ImageMagick

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