Thanks a lot for the clarification!!
Oh BTW, just for giggles: If the image was rotated before, I'm pretty
sure it was with Windows Picture & Fax Viewer! :)
Jean-Nicolas Jolivet
On 12-Dec-08, at 6:43 PM, Ken Ferry wrote:
On Fri, Dec 12, 2008 at 2:32 PM, Jean-Nicolas Jolivet
<silver...@videotron.ca> wrote:
Hi there!
After some more tests (i.e. with sample canon images that I
downloaded) it
doesn't seem to be a problem... so basically the problem only
occurs with
one set of pictures that I have on my HD...
I don't remember rotating these pictures manually, but I guess it
would
explain the weird behavior I'm getting when working with these
images...
Anyway, here's one of those "odd" pictures, they dont get rotated
if you
look at them in Preview, and still, if I process them (re-size
them, using
NSBitmapImageRep etc...) they get rotated automatically...
Thanks.
Okay, what you have here is a corrupt image. The data on the disk is
in orientation 1, but the metadata claims it's in orientation 8.
What you're seeing is that Preview (i.e. ImageKit) interprets the
orientation and thus gets displays it 'correctly' given the
corruption, while NSBitmapImageRep does not.
Most apps that post-process an image to put it into orientation 1 are
also bright enough to remove the metadata that claims it's in some
other orientation. Unfortunately, not whatever has been used to
process this image!
-Ken
Jean-Nicolas Jolivet
On 12-Dec-08, at 5:20 PM, Ken Ferry wrote:
Hi Jean-Nicolas,
Could you send me one of these auto-rotated images?
NSBitmapImageRep
does not do any automatic orientation correction in 10.5. Is it
possible that your Canon camera is writing out an already-rotated
file
in orientation 1?
If ImageIO is doing automatic orientation correction for certain RAW
formats (which would be news to me), then it should report 1 for the
orientation, since it's already been handled.
-Ken
Cocoa Frameworks
On Fri, Dec 12, 2008 at 1:55 PM, Jean-Nicolas Jolivet
<silver...@videotron.ca> wrote:
I'm re-sizing some NSBitmapImage reps (mostly JPGs or RAW, both
full-size
images straight from a digital camera)...
I'm working almost exclusively with NSBitmapImageRep (using
[NSGraphicsContext graphicsContextWithBitmapImageRep:] when
drawing
etc..)
With some images( the ones I took with my Canon camera) the
orientation
is
automatically handled (i.e. Portrait images are rotated
automatically)
without me doing anything! I'm just re-sizing them and they get
rotated
automatically!
With other images (JPGs and NEF images that I took with my Nikon
cam), it
doesn't happen...
Now I was wondering, how am I supposed to deal with this
inconsistent
behavior? Especially if I want to rotate my pictures
automatically when I
re-draw them...
I'm able to get the Image orientation using a CGImageSourceRef
and the
kCGImagePropertyOrientation property.. and that property seems to
give a
correct value with all the images I tried... my first instinct
was to use
this property and rotate the picture if needed (i.e. if the
orientation
is
!= 1... rotate accordingly)... but it definitely wouldn't work
with my
Canon
pictures, which somehow get rotated automatically without me
having to do
anything... (i.e. if I read the kCGImagePropertyOrientation and
see that
it's not equal to 1, I rotate the picture... which has already been
rotated
automatically... so I end up with an image that has been rotated
twice...)....
Is there any reliable way I can rotate my images to the correct
orientation
??
Jean-Nicolas Jolivet
silver...@videotron.ca
http://www.silverscripting.com
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Jean-Nicolas Jolivet
silver...@videotron.ca
http://www.silverscripting.com
Jean-Nicolas Jolivet
silver...@videotron.ca
http://www.silverscripting.com
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