Hi Folks, I have a little query which someone may be able to clarify. Background: I download photos off my digital camera. These are 2304x1728 (4:3) JPEGS, 8pits/pixel, around 2MB in size. As well as storing the originals, I also re-size them to 1024x768 (also 4:3, linear reduction by factor 2.25) because (a) at that geometry they exactly fit my screen, (b) they then come out much smaller in byte-size, convenient for emailing for instance. I do the re-sizing as follows, in ImageMagick: 1. display photo.jpg 2. View --> Resize --> 1024x768 --> Resize 3. File --> Save --> new filename --> Save and here's where my query comes. At this point I get a popup window which asks me the "Choose JPEG quality" with default option 75%. I've wondered how much this "quality" matters, so I've done a bit of experimentation, saving the re-sized file both at 75% (the default) and 100%. Then I put both of them up (on different "workspace" panels) and flip between them. Try as I may, I can't visually perceive any difference between them. Yet, for example, one 75% file has 171064 bytes, and its 100% counterpart has 694833 bytes, 4 times larger. At that difference in byte size, I'm surprised that there's no perceptible difference! Any ideas? With thanks, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.harding@nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 11-Mar-07 Time: 18:00:49 ------------------------------ XFMail ------------------------------