Stephen Shepherd writes: >> Maybe I am being a bit vague here or just dumb but this is why I am a little confused. I know I do not want to save a .jpg over a .jpg but what seems to happen is that once imported from the camera the .jpg file is in a folder, I then open the .jpg, I may want to change the saturation so I do this after which when I hit save I get the .jpg option box up in photoshop asking if I want to save at 1 through to 12. <<
Hi Stephen, if the current file is saved with as JPG, hitting save again will resave it as a JPG over the top of itself (just making the point clear if it was not <g>). The message box you see is there because Photoshop does not know which quality setting the third party non Adobe JPG writer to used. >> The file does not just save as it was, it came from the camera and once opened in PS when you come to save it you need to specify your settings unlike a file already in the PS .jpg which if you adjusted the saturation and then saved it justs saves it. << Yes, If Adobe write the file - then they know what level of compression was used, so when the save command is used again the same amount of compression is applied without the presentation of the dialog box to choose quality levels (one must now save as to get this). It is still saving a lossy compressed file over a lossy compressed file. There are tests one can do to see how 'bad' all this is, depending on workflow and edits and resaves, but I have not come over anyone who can be bothered to do a 'definitive' whitepaper on the real world use of JPEG and the nuts of bolts behind resaving a jpeg as a jpeg and how different vendors approaches and different edits and image content affects all this. Anyone out there need a topic for their thesis? <g> Hope that makes sense. Stephen Marsh. =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
