Beth; Hi; Don't know for sure what some of the choices mean, but I
might hazard a guess. There should be somewhere a help file in the
software, online help, or a book that will answer these questions.
What software is it?
The best compression best quality is easiest.
If you are going over the web - go with compression. The amount
will depend on the detail in your photo. It might even convert your
pics into TIF or JIF files. It will throw out a lot of redundant
(maybe even lose some detail in the process). Will
probable bring the resolution down to 72 dpi (the image has 72 dots
or pixels in an inch long line). It might even reduce the color
choices to 256 if there is serious compression.
Progressive might be for optimizing the picture for video display
over a computer monitor as opposed to a NTSC or video monitor.
Computer monitors and video (TV) monitors read different. Computer
or RGB monitors read the picture line by line - going 1, 2, 3, 4, 5 .
. . . etc. until the end. NTSC monitors read two fields that are
different. Each field reads alternate lines. The first field is
composed of the odd number liens i.e. 1, 3, 5, 7, 9 . . . etc until
the lost one. The other field is 2, 4, 6, 8, . . . etc. until the
end. Each of these fields is displayed 30 times a second, giving 60
different pictures a second to our eyes. Because of the way our
eyes work each pair of frames is seen as one picture (a phenomena
called persistence of vision) Progressive scan also reads 60 times a
The optimize Hoffman codes might be choices for converting the image
to a video friendly image. It could pull up a list of choices about
which field first (odd or even). Also NTSC, PAL, SECAM. These are
types of video. In the US and, I believe Japan, we use NTSC. Most
of Europe uses PAL (which is a progressive scan 50 times a second).
SECAM is used by some other countries. There is one or two others
that are used also but not much. They are not interchangeable. You
can't bring a PAL video home from Europe and play it on your VCR.
Won't happen - at least that anyone will want to watch. They can be
converted but there are artifacts in the conversion version (nice
words)and it is an expensive process. It's not something you get
done on every street corner and the people who do it like to have you
walking into their store backwards and bent over already. It makes
getting at your wallet so much easier. You'll generally get a coffee
Smoothing might be an anti-aliasing working. It will lessen the
stair step details in a diagonal line and at the edges of things.
These are just mights and maybes. Rereading your post, I see that
they are JPEG choices. So maybe throw out the TIF and JIF
conversions. But I've seen some programs that do the conversions
when it is told you are optimizing for web. But progressive is