modify metadata of a file JPEG

[clemay01]

HI,

I would like to have an example of code VBA which would enable me to
reach and to modify the metadata of a file JPEG.


Which library I have to use???

 

[Dirk Goldgar]

HI,

I would like to have an example of code VBA which would enable me to
reach and to modify the metadata of a file JPEG.


Which library I have to use???

Poke around a www.lebans.com, especially the downloads posted at

http://www.lebans.com/loadjpeggif.htm

There may well be something there that will help you.

 

[Stephen Lebans]

Nope, nothing on my site to handle the metadata of a Jpeg file. I'm sure if
the OP searches VB land they will find some code.

--

HTH
Stephen Lebans
http://www.lebans.com
Access Code, Tips and Tricks
Please respond only to the newsgroups so everyone can benefit.

 

[Dirk Goldgar]

Nope, nothing on my site to handle the metadata of a Jpeg file.

You astonish me, Stephen. You mean you haven't gotten around to that
yet? <g>

 

[Stephen Lebans]

No one ever asked.<grin>

--

HTH
Stephen Lebans
http://www.lebans.com
Access Code, Tips and Tricks
Please respond only to the newsgroups so everyone can benefit.

 

[Fred Boer]

Hi!

Ok, so I looked up "Metadata", and I've learned it is data that describes
other data: like a library card describing a book - library card has data,
the book contains data...

But what would metadata of an image be? File size? Number of colours? Is
metadata of an image something that is commonly used? (I'm not certain if
the sense of your comment to Stephen is that doing something like this is so
"basic" you would certainly have expected him to deal with it, or that it is
so "arcane and complex" that this isn't really something rationally to be
expected of him. - even given his propensity for defying rational
expectations... and I hate it when I don't get a joke!)

Cheers!
Fred

 

[Dirk Goldgar]

Hi!

Ok, so I looked up "Metadata", and I've learned it is data that
describes other data: like a library card describing a book - library
card has data, the book contains data...

But what would metadata of an image be? File size? Number of colours?
Is metadata of an image something that is commonly used? (I'm not
certain if the sense of your comment to Stephen is that doing
something like this is so "basic" you would certainly have expected
him to deal with it, or that it is so "arcane and complex" that this
isn't really something rationally to be expected of him. - even given
his propensity for defying rational expectations...

The latter was my intention.

and I hate it when I don't get a joke!)

I don't really know much about it, Fred. The JPEG format allows for
metadata describing the image to be encoded in the image file, but I
don't know what all can go in there. I'm pretty sure images from
digital cameras can include information like shutter speed, aperture,
and the date/time the photo was taken. I don't know whether thumbnails,
which can be included in the .jpg files, count as metadata or not,
though logically I'd say they should.

Maybe Stephen can tell you more about it -- I expect he knows about it,
even if he's never made it a project to manipulate it.

 

[Stephen Lebans]

I don't know much about it as I have not found the need for this info in my
Jpeg projects to date. As you surmised it is additional information
regarding the image. I'm only familiar with EXIF Metadata as it pertains to
images from a digital Camera.

I just finished several weeks of decoding OLE object fields. There are no
published specs. JPEG file Metadata would be a breeze because there is a
published spec.
--

HTH
Stephen Lebans
http://www.lebans.com
Access Code, Tips and Tricks
Please respond only to the newsgroups so everyone can benefit.

 

[Fred Boer]

Thanks to both of you!

Cheers!
Fred

I don't know much about it as I have not found the need for this info in my
Jpeg projects to date. As you surmised it is additional information
regarding the image. I'm only familiar with EXIF Metadata as it pertains to
images from a digital Camera.

I just finished several weeks of decoding OLE object fields. There are no
published specs. JPEG file Metadata would be a breeze because there is a
published spec.
--

HTH
Stephen Lebans
http://www.lebans.com
Access Code, Tips and Tricks
Please respond only to the newsgroups so everyone can benefit.