I wanted to build an awesome place for people to discuss module specific issues, but I don't have any more time for this, and there are much better places to discuss Perl-related issues. I'd recommend asking your question on Stack Overflow or on Perl Monks.
If you are looking for a Perl tutorial or Perl-related news, I hope these links will serve you well.
Image-ExifTool
Posted on 2007-07-04 13:35:06-07 by haydnw
Writing JPG metadata, and image quality
I know that when you open and re-save a JPG, you lose quality each time due to the 'lossy' compression applied, and that this can lead to a degradation in image quality over a series of repeats. Does writing the metadata in a JPG cause any change to the actual image data in the same way? Or is the image unaffected? It doesn't bother me in any serious way because I'm only doing it once and all my really important images are stored as RAW anyway. I'm just curious. :)
Direct Responses: 5633 | Write a response
Posted on 2007-07-04 14:24:05-07 by exiftool in response to 5632
Re: Writing JPG metadata, and image quality
Writing meta information with exiftool is lossless. The image data itself is simply copied over to the modified file, byte for byte. This applies to all image types: JPEG, RAW, etc.

- Phil
Direct Responses: 5638 | Write a response
Posted on 2007-07-04 18:40:50-07 by haydnw in response to 5633
Re: Writing JPG metadata, and image quality
That's great, thanks very much. :)
Direct Responses: Write a response