rotating pictures on the fly

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JimO - 13 May 2007 01:03 GMT

Is there a way in vb.net to, 1) detect if an image has been taken with a

> camera on a vertical axis, and 2) rotate the picture for display - across
> an
> intranet (asp.net), with huge files sizes (2 - 3 MB), that doesn't take
> too long?
> (LOL)
>
> Thanks,
> Jim

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Peter Duniho - 13 May 2007 02:30 GMT

> Is there a way in vb.net to, 1) detect if an image has been taken with a
> camera on a vertical axis, and 2) rotate the picture for display -
> across an intranet (asp.net), with huge files sizes (2 - 3 MB), that
> doesn't take too long?

Unless you are dealing with a camera that has a built-in sensor that
detects orientation *and* the camera stores that information in a custom
EXIF field *and* that data is preserved in the copy of the image you're
looking at, you cannot do #1 without human assistance. I'm not aware of
any available general-purpose algorithm to detect picture orientation
based on the contents alone.

As far as #2 goes, that's pretty simple once you've read the image in.
You can use the Image.RotateFlip() method on a Bitmap that you've loaded
from a file.

I hate to break it to you, but even for compressed JPEGs, 2-3 MB isn't
that big anymore. :)

Pete

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JimO - 13 May 2007 17:24 GMT

I hate to break it to you, but even for compressed JPEGs, 2-3 MB isn't
that big anymore. :)

LOL well... yeah... but I have to display it on a web page. Although, given
the fact it would be accross a a gigabit wire within a small network (like 2
or 3 machines), it may not take that long. One the other hand, I would want
to resize the display to a thumbnail image (like maybe 200x300) onto kind of
a contact sheet. When paging through them, that might take a while if there
are more than a few per page. The camera would be either a Nikon D50 or a
D200. Other software I use will rotate the image, when needed, so, I
know the info is in there somewhere.

>> Is there a way in vb.net to, 1) detect if an image has been taken with a
>> camera on a vertical axis, and 2) rotate the picture for display -
[quoted text clipped - 16 lines]
>
> Pete

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rotating pictures on the fly

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