Re: Recovery by Charge Coupled Device

Stuart Lamble wrote:
Well, I can't speak for all new cameras, but my 20D has such a thing. It
goes through the process of encoding in exactly the same fashion, and sets
some flag in the JPEG to say "rotate this image upon display".

Peter Corlett replied:
It's in the EXIF data.

Robert Sneddon asked:
Why bother? Why not rotate the image in the camera before writing it to
the memory card? Even RAW data could be rotated without loss of detail.

Sir, I believe you are being insufficiently cynical here.

I can't speak for other cameras, but my cheap-and-cheerful Canon A510
has a sensor to set the orientation in the EXIF data. And it sometimes
gets it wrong, even if the camera is at rest (or as near to "at rest
relative to the Earth" as I can make it).

Canon even have a menu option in the device to "rotate the image"
(effectively, to change this EXIF flag). In other words, they have a
consumer-level electronics device that doesn't work properly, and
instead of fixing it, they go to the trouble of writing a "make-it-work"
option for the user interface.

So they "need" to be able to "rotate" images *after* they've been
written to the card.

(I must admit that although the camera has other limitations, they're
the ones you might expect for a camera of its price, such as a 3.2
megapixel CCD.)

Of course, it doesn't help that I occasionally take photographs at 30
degrees to horizontal. Surprisingly, EXIF doesn't seem to have a flag
for that...

James.

--
E-mail address: james | I must refute the rumour that one of our team members
@westexe.demon.co.uk | walks on water. Although it's true that Barry Cryer
| runs on lager...
| -- "I'm Sorry, I Haven't A Clue", BBC Radio 4
.

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