EOS 10D Auto Rotate Bug?

[atlphoto]

Hi All,
I have been experimenting with the auto rotate feature on my 10D, and believe that the 10D is setting the exif orientation _and_ rotating the jpeg. This causes double rotation of the image when viewed in an application which honors the exif orientation flag.

My understanding is that if the exif orientation is set, the image _needs_ rotation. Canon's interpretation seems to be that the exif orientation indicates that the image _was_ rotated. This is contrary to the assumption of the applications listed below.

Try this:
take two pictures, vertical, with the same camera orientation. On one, set the auto rotate feature to on, on the other, set the auto rotate feature to off. Load them into you favorite non-canon image viewer which honors exif orientation. The two photos will be 180 degrees rotated from each other!

I have read a good deal of frustration with auto rotate, but have not seen this explanation before. My guess is that people do not usually remember which way they rotated the camera to get the vertical shot.

These Applications all seem to honor the exif orientation flag (Sorry windows guys, some of these are mac only).

Graphic Converter (Can set behavior in a preference pane)
iPhoto
Photoshop CS
iView Media Pro

Any Comments?

Cheers,
Drew

[iwatkins]

I always have auto rotate set on the camera (10D).

I use Photoshop CS (Windows) to process the images and have not once had any problems nor ever had to rotate an image to get it the right way up etc.

Cheers

Ian

[PaulB]

That could explain why I turned AR off shortly after getting my 10D, after trying it for a while. Can't remember now - had the camera 10 months!
I use a BG-ED3 and all (the vast majority anyway) of my portrait orientation shots are rotated anti-clockwise.
Must try what you suggest and see if it happens with my Win XP software.

[PacAce]

I always have auto rotate set on the camera (10D).

I use Photoshop CS (Windows) to process the images and have not once had any problems nor ever had to rotate an image to get it the right way up etc.

Cheers

Ian

I believe this problem only occurs when shooting JPEG. I noticed the same problem with the G3 on my wife's pictures but not with mine. I shoot RAW and she shoots JPEG.

[atlphoto]

A little more research. It looks like an Apple bug, and not a Canon bug.

Looks like a bug in Apple's ImageCapture program. It rotates the image then _adds_ another orientation tag. So.. The image comes in, tagged properly with an 8 (rotated anti clockwise) . Image Capture then rotates the image, and adds a tag of 1 (not rotated) before the original tag of 8.

Then, an orientation aware program opens the image, reading in the tags. It sees the 1, then sees the 8, and assumes that the latter is correct. It then rotates the image again.

Well, at least I know how to get around this now. I won't be using ImageCapture until it is fixed.