Posted by Mattia Gentilini on 05/03/07 14:45

Milagro ha scritto:
> I'm using the code below to create thumbnails from photos. The code
> works fine and thumbnails are created. However, thumbnails of vertical
> photos are oriented as horizontal photos.
It seems you have to check the EXIF orientation. EXIF is a metadata
section for JPEG, which most cameras set when they take a photo.
You could access the EXIF data using the exif_read_data() function (see
the doc for info about input parameters) which will return you an array.
After that, you could deterine if the image has to be rotated in this
way ($exif is the array returned by exif_read_data() ):

$o = $exif["IFD0"]["Orientation"];
$rotate = 0;
$flip = false;
switch($o) {
case 1:
$rotate = 0;
$flip = false;
break;

case 2:
$rotate = 0;
$flip = true;
break;

case 3:
$rotate = 180;
$flip = false;
break;

case 4:
$rotate = 180;
$flip = true;
break;

case 5:
$rotate = 90;
$flip = true;
break;

case 6:
$rotate = 90;
$flip = false;
break;

case 7:
$rotate = 270;
$flip = true;
break;

case 8:
$rotate = 270;
$flip = false;
break;
}

Now, $rotate indicates how many degrees the image should be rotated
(clockwise). Then, if $flip is true , you should also flip horizontally
the image (normally this is not the case for digital camera photos)

--
|\/|55: Mattia Gentilini e 55 GigaHertz nel processore
|/_| ETICS project at CNAF, INFN, Bologna, Italy
|\/| www.getfirefox.com www.getthunderbird.com
* Using Mac OS X 10.4.9 powered by Cerebros (Core 2 Duo) *

[Back to original message]