From
John
H ROGERS
© . . . . . . . Subject: Re: 'HELP' -- format of images
Dear Clay &
colleagues,
Yes, standardisation of image formats would be good. Here are my suggestions:
Naming of files:----------------
Please use
file-names representing the date in the order year-month-day. Since the year
2000, I also think it is much better to write the year in full, and to use a
3-letter abbreviation for the month, not a number. Thus: 2003Mar03, not 030303!
(It is very confusing to have dates such as
010203, 030201, etc.etc.) I also like to have the observer's initials at the end of the
filename.
However we also want
filenames that can be compatible with the JUPOS system, to make minimum work
for Hans-Joerg and others doing the
measurements. The guidelines are on:
http://home.t-online.de/home/h.j.mettig/
or http://www.jupos.org
"You can help
to simplify measurements if you name each file in the form MDDHHMMM.<extension> where: M ... month (1= Jan., ..., 9= Sep., O= Oct., N= Nov., D= Dec.), DD ... day, HH ... hour, MMM ... minute plus tenth of minute (or just the full minute)."
Hans- Joerg, what is your preference for filenames at
present?
Data on image: ---------------
Pleae write all essential data
on the image - it is much more work to keep track of extra text files. As the JUPOS guidelines say: "Please
write date and time(s) of exposure(s), and the colour channel(s) directly to each image, close to Jupiter's disc. Do only use
Universal Time (UT) to avoid worldwide confusion. "Also include your name! If you use different cameras or telescopes,
or observe from different countries during the year, it is informative to have
this information on the image also.
Orientation: -------------
For BAA reports we
use south up, because this is compatible with (i) the view seen by most visual observers, & (ii) cylindrical projection
maps in which longitude and time increase from left to right, consistent with
the telescopic view and the left-to-right flow of western scripts. Some
observers are keen to use north up to agree with the preferences of space
scientists. It does not really matter, for me or for JUPOS. However I do recommend that you make the
belts horizontal, because images have to be horizontal if used for montages or
maps, and unnecessary rotations may degrade resolution.
File size: ---------
Of course image
files should not be too large. But
please use enough pixels to preserve the full resolution of the original image,
and do not compress the JPEG file too much - 'high' but not 'maximum' quality
is usually satisfactory. …
(
John ROGERS (
Jupiter Section Director, BAA