I looked at the Nikon950 pictures sample (in the "fine JPEG mode" and the "tif mode" in 1600x1200 resolution).

I didn't notice any differences between the uncompressed 5.7Mb file and the 850 Kb best JPEG compressed mode. This is true for test pattern image or closed portrait or landscape pictures. So why the uncompressed mode does exist?

Am I wrong or does someone see differences between these two modes (on the Nikon950 or another camera).

Thanks Francois

-- Francois DAVID (FjhDAVID@aol.com), March 19, 1999

Answers

You will see the difference after printing out the two photos.

-- RS (justin_dec@hotmail.com), March 20, 1999.

The main problem ,as I see it , is that if you save picture as JPEG repeatedly , for example in the case that you tend to make corrections to it every time you look at it , the degradation in quality will become more and more obvious. Many of my own early pictures suffered badly, since I had no idea of this. Now I as a rule save pictures as TIFF until I am QUITE sure I will not change them any more.This is of course more important for the experimenter photographer than for the more common snapshoter, I suppose. It is increasingly problematic when uncompressed files grow in size with better cameras, but storing capasities also increase in capasity, after all.

-- Ola Sletteboe (sletol@online.no), March 20, 1999.