Vista - How can you change the comments property of a jpg

I want to change the comments property of a jpg
any ideas

> I want to change the comments property of a jpgThere are actually a number of JPG comments.
There are the EXIF tags, which are identified numerically
and stored in the JPG file header. Most of the EXIF tags
are concerned with camera info. Then there are also IPTC
tags. IPTC is an entirely different system of tags established
by the Newspaper Association of America (NAA) and the
International Press Telecommunications Council (IPTC).
IPTC tags were meant to be used by journalists to save
info. like copyright, photographer name, image description, etc.

All of that is optional, stored in the JPG file header
if present.

If you're thinking of the comments in the Properties
window on WinXP, that's actually a particular, custom
EXIF tag that Microsoft uses. MS uses a single EXIF tag
for their properties, which are stored as unicode. (Unlike
all other EXIF tags, which are stored as ansii strings.)
Microsoft (or at least WinXP) does not recognize IPTC
tags. If you save properties via Windows it will corrupt
and/or erase any existing IPTC tags in the file header.

As for writing the comments, that might be tricky to
do programmatically. There are components available, but
I don't know if there's anything free that will do it.

You could also see this link:

www.jsware.net/jsware/scripts.php5#jpginf

The download is a script that uses only basic VBS and
Textstream methods to read IPTC and EXIF tags from
a JPG file header, and to extract the thumbnail that most
cameras write to the file header. From the script you can see
the basic structure, and you can find JPG header specs
online. From that you could theoretically write a script to
write comments to a JPG file, but it would be a tedious job
because there are so many optional types of data that can
be saved in a JPG file header, and it all has to be saved in
complex, predefined structures. You would need to find all of
the data in the existing header, then write a new header that
doesn't lose the original tags/thumbnail while saving new
comments.

Thanks I'll give the component a try


"mayayana" <mayaXXyana@xxxxxx> wrote in message
news:%23$HOVC6RJHA.5860@xxxxxx

Hi

Were you able to code this, I also need to update the comments.
Any help would be appreciated.

Thanks
Ravi

"ThatsIT.net.au" wrote:

This Script is great

www.jsware.net/jsware/scripts.php5#jpginf

It gave me desired results .. YAY !!!


"Ravinder" wrote:

> This Script is greatThat was easy. That script doesn't change
properties, though. It only reads them. You said
you need to "update the comments". Personally
I wouldn't try that with a script. A JPG header
is very complex and poorly designed. To parse and
rebuild it with Textstream would be awkward.