Re: What benefit .png over .jpg?

Having photographed professionally for over twenty years and digitally for
12 of those, my rule of thumb is to always shoot with the best equipment
and film/settings as possible. An 8 mp camera with a better cmos sensor
with better lenses can give you better images than a cheaper sensor and
more pixels. Example the original Nikon pro D1 only had only 4 mp but its
ccd sensor remained unmatched by anyone for years even at higher
resolution. It wasn't until the 3 generation cmos sensors the Canon could
boast comparable results in their pro EOS line. My wife has a Panasonic
14mp and I can still out shoot it with my Canon EOS 30D at 8 mp.

GIF and PNG are as others have mentioned more for internet uses where 256
colors or web corrected colors are adequate. JPEG is also for use on web
and digital formats where more complex images are needed but where with
help of programs like Gimp and Photoshop can convert larger stable images
into jpeg with algorithms that use color choices that reduce the chance of
losing more detail.

That said a best practice is always to shoot in raw. Raw saves all of the
shot information (EXIF data) in the image for further manipulation later.
If you shoot in jpeg this info not available to you. If you enter digital
completions your images may be disqualified without EXIF data. When I
shot film I always stored my negatives in glass paper covers and kept them
in low light cabinets in ac controlled environments because this is the
best way to ensure that your originals stayed chemically inert. I would
consider the shooting and storing of images in raw the equivalent to
this. I you need a lossless compressible file format save a copy as a
TIFF.

James
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