In-camera image rotation

Any comments on whether it is advisable to let my camera (Canon 350D)
rotate vertical images, or if I should do this myself in Photoshop?

I seem to recall four years ago when I bought a G2 that the common
wisdom was that Photoshop handled the rotation much better, but I'm
guessing the current crop of camera software is much improved.

Dave Addison wrote:
Any comments on whether it is advisable to let my camera (Canon 350D)
rotate vertical images, or if I should do this myself in Photoshop?

I seem to recall four years ago when I bought a G2 that the common
wisdom was that Photoshop handled the rotation much better, but I'm
guessing the current crop of camera software is much improved.


A 90 degree image rotation is a very simple operation
(it is achieved by transposing the image matrix). No
interpolation is necessary as in the case of an arbitrary
angle.

Dave Addison wrote:
Any comments on whether it is advisable to let my camera (Canon 350D)
rotate vertical images, or if I should do this myself in Photoshop?

I seem to recall four years ago when I bought a G2 that the common
wisdom was that Photoshop handled the rotation much better, but I'm
guessing the current crop of camera software is much improved.

The camera doesn't rotate the image; it rotates the preview, and sets
the orientation flag in the EXIF tag so software that recognizes it can
auto-rotate.



---
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 0550-2, 12/14/2005
Tested on: 12/14/2005 11:37:18 PM
avast! - copyright (c) 1988-2005 ALWIL Software.
http://www.avast.com

On Thu, 15 Dec 2005 16:13:07 +1300, Dave Addison
wrote:

Any comments on whether it is advisable to let my camera (Canon 350D)
rotate vertical images, or if I should do this myself in Photoshop?

I seem to recall four years ago when I bought a G2 that the common
wisdom was that Photoshop handled the rotation much better, but I'm
guessing the current crop of camera software is much improved.

My DRebel/300D doesn't rotate the image in the file, just in the
display.
I think it also sets a flag for an image display sysytem that will
recognize it, but I don't use any of them. When I use something like
PSP to display a "rotated" image, it's not rotated.

--
Bill Funk
Replace "g" with "a"
funktionality.blogspot.com

My G3 provides 2 pictures when downloading verticals. They appear to
be identical (same pixel count, visually identical).

Dave,
I've set my Canon 350D to rotate the image.
When I import them into Photoshop CS2, they rotate automatically.
The question now might be, if I didn't set my 350D to rotate the image,
would Photoshop do it automatically? I don't know.
Cheers,
Marcel

"Celcius" wrote in message
ups.com...
Dave,
I've set my Canon 350D to rotate the image.
When I import them into Photoshop CS2, they rotate automatically.
The question now might be, if I didn't set my 350D to rotate the image,
would Photoshop do it automatically? I don't know.
Cheers,
Marcel

I don't believe it would, I can't think of any way software could know how
you shot the image. That information is part of exif data when you select
the option. I have this on my A95, I think it's just a convenience feature.
Dave Cohen

Bill Funk wrote:
On Thu, 15 Dec 2005 16:13:07 +1300, Dave Addison
wrote:

Any comments on whether it is advisable to let my camera (Canon 350D)
rotate vertical images, or if I should do this myself in Photoshop?

I seem to recall four years ago when I bought a G2 that the common
wisdom was that Photoshop handled the rotation much better, but I'm
guessing the current crop of camera software is much improved.

My DRebel/300D doesn't rotate the image in the file, just in the
display.
I think it also sets a flag for an image display sysytem that will
recognize it, but I don't use any of them. When I use something like
PSP to display a "rotated" image, it's not rotated.


Some cameras contain an 'orientation sensor' which lets the firmware
know that the camera is turned on end, or held in the normal (landscape)
position. The pictures are usually just rotated for display software,
based on the indicator in the file.
Note that when taking pictures with the camera tilted to look downward,
this can cause the camera to misinterpret the position and set the
rotation indicator when you don't want it set. Most good display
software can change this.