> From: Shangara Singh Sent: Tuesday, November 16, 2004 8:08 > To: ProDIG > Subject: Re: [PRODIG] jpeging jpegs after EXIF stripping > > It was 16/11/04 10:56 am, when michael shaffer wrote: > > > I would even suggest you save the file with the original setting (a simple > > save), and compare the difference with the dupe after re-opening. PS users > > have claimed to see JPEG degradation only when the bitmap data is changed, > > not information independent of it (e.g., image information) ... as if PS > has > > an algorithm for recognizing and duplicating the compression. > > Michael > > I don't think that's true...You will get some degradation, or rather a very > minute change in the value of some of the pixels, even if a JPEG was saved > at the highest quality setting and then resaved after striping only the > non-bitmap data. > > If you were to strip the non-bitmap data without opening the file, then you > may escape "degradation." Hopefully, Photoshop CS II will give us the means > to strip camera EXIF data from within the File Browser without opening the > file. <g>
It might be semantics but I do expect it to be practical to open a JPG and display it, change the EXIF data and if no graphical editing was done, the program does not need to look for how the conversion was previously done, it just needs to read the original picture data again and then save that unmodified data plus the new changes in the EXIF. That sounds reasonable to me. Bertho =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
