Phil Parker wrote:

>On 09/29/2004 at 03:29 PM, "Mike O'Connor"
 wrote: >Phil Parker wrote:
>
>>>On 09/29/2004 at 02:39 PM, "Mike O'Connor"
 wrote: >Phil Parker wrote:
>>>
>>>>>Is there any native OS/2 tool that would let me
add/edit these in JPEGs?
>>>>>
>>>>Hexedit .exe from the Graham utilities for one!
>>>>
>>>So, any hex editor, right? Unfortunately, that requires more
knowledge of JPEG internals (formats/offsets, whatevers) than I know.
>>>
>>>How would I find the JFIF comment block? Is it in a standard
place in a JPEG file? Is it a fixed size or variable? If variable, how do I
go about enlarging it/shrinking it? My experience with editing binaries is
VERY limited, but has taught me about problems from changing the overall
byte count etc.
>>>
>>>If I have several hundred such JPEGs to be edited similarly
(add the contents of a 7-bit ASCII text file to the JFIF comment block),
can this be automated via a command-line script of some sort?
>>>
>>>Is that the sort of job that those famous unixish tools (sed,
(g)awk, perl, et al.) handle well?
>>>
>>>All suggestions, comments, etc. gratefully accepted, and offers
of help even more gratefully accepted. (I don't mind learning, but usually
need help.)
>>>
>>Hi Phil,
>>I'm a little confused here - where do you get to see
"comments" with a  JPEG? Is this inside some graphics program?
>>    
>>
>
>Yes. According to P. Nielsen, his PMView will show the contents of a JPEG's
>standard JFIF comment block (if any, max 64 KB) as part of the results one
>gets from File -> Info, but does not have any capability for editing such.
>
>The idea is to be able to read the captions to the hundreds of astronomical
>images I have from inside PMView, so that I don't have to go hunting
down the separate text files where these captions are now stored, opening
them
>separately in another app, etc.
>
>>Are these the EA-comments you are talking about? 
>>    
>>
>
>No. I tried adding some as a test, but could find no way to read them
inside PMView. 
>
>When I asked on the pmview-discuss list, the solution was to put my
captions (typically 2-3 KB) in a standard JFIF comment block.
Unfortunately, no one there knew of any OS/2 native tools to do that.
(There are of course several Win$#!% ones, but I've never had a Win$#!%
system and would rather not get one now.
>  
>

Hi Phil,
Well it was just a thought!
I've never used the FILE --> Info facility in PMView as most of the 
images I use it with I've created myself, so I've never noticed whether 
any of the jpegs I have do have any comments.
[See the other list for response on labels]

-- 
Regards,
Mike

Failed the exam for
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MCSE - Minesweeper Consultant and Solitaire Expert
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