On 6 Dec 2005 at 0:22, Shel Belinkoff wrote: > But it's not a 43mb TIFF - it's a 6.5mb JPEG. How does a small JPEG turn > into a larger TIFF file containing more information? Once a file is a > JPEG, the information it contained as a TIFF or PSD is gone.
This isn't always practically the case, for instance consider a 6MP image containing a single colour, it would save as about 36MB as a 16 bit tiff however even saved as best quality jpeg it would probably be under 500kB, no data is lost. As the complexity of the image increases then so does the size of the jpeg image, the tiff however always remains the same size (so long as it is saved as uncompressed). Just looking at a typical image of mine with high detail and saved as a 16bit tiff has a 67MB file size, converted to 8bit and saved as best quality jpeg it ends up at 5.4MB. I'd hazard a guess that if both files were printed at the optimum print resolution and colour space they would likely be indistinguishable on all but the very best of todays printers. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
