Re: More stuff

From: <poml_at_poeml.de>
Date: Mon, 9 Sep 2002 00:38:33 +0100
Hi guys,

that's really funny. I found out exactly the same things today, as you
did Dennis! :)

Read my log for the new camera.c I commited? :)

Yes, the thumbnail is in BMP format. It is then converted from the
windows driver into a app. 3kb JFIF Jpeg. I have one of these BMP, I
squeezed it out of the windows driver.

But I coudln't find it in the corresponding Exif.
Very good work, that you did, Dennis!!!

Also there is this "new" 0x000B command, the windows driver ALWAYS
transfers the whole first exif.

I think this is because it contains this strange "directory".

I found out, that with beginning of 10 or more pictures on the camera,
the directory names are written right into the picture data.
So, for example XV or GIMP can't read the exif anymore.

So, with 50 pictures or so, you end up with a first picture FULL of
directory entries.

Wht are we going to do about this?

Somehow it seems, that the windows driver doesn't really read the EXIF.

It just knows, where it's JPEG information are stored, and then throws
away the EXIF.

This is also underlined, by the fact, that, for getting the thumbnails,
it justs transfers the first 100 bulk packages of a picture.

So, it has an uncomplete EXIF but gets the thumbnailanyway.

So, I guess, the whole EXIF thing is complete rubbish. You just need to
know, where your picture data is, extract it, give it some headers --
which can't be so difficult, because they are all of the same size,
quality, color, etc. -- and then throw away the exif file.

What are we doing with the rescaling? Did anyone found a difference
beside the byte size in the pictures?

I will enjoy your code tomorrow, Dennis! :)

Let's keep on working!

Ph

Received on Mon Sep 09 2002 - 01:38:49 CEST

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