When saving JPG images with Pixelmator or Photoshop, I select a quality from the scale 1–100 that gives optimum file-size.
Later on, I sometimes take these images and crop them a little more (not always possible to find the originals), but when re-saving I can no longer know what quality I saved them with.*
Are there any Mac programs that will reveal the quality that the JPG was saved at?
* Perhaps this is not the right way of going about it, because it seems that, for example, if I'm already saving a file that was saved lossy at 59 quality previously, and then go ahead and I save it again (even at 59 or 99), it will loose even more quality? Correct?