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Rosetta PDS, Images and other products made from archived data
JohnVV
post Oct 2 2016, 12:49 AM
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the img files are not 32 bit float

they are 16 bit LSB unsigned as per the label on the img file
QUOTE
SAMPLE_TYPE = LSB_UNSIGNED_INTEGER
SAMPLE_BITS = 16

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chuck0
post Oct 2 2016, 09:48 AM
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That label is for a NAVCAM image file, not an OSIRIS one. The OSIRIS ones are 32bit float

http://imagearchives.esac.esa.int/picture....26/category/252


QUOTE
Object = IMAGE
INTERCHANGE_FORMAT = BINARY
LINES = 2048
LINE_SAMPLES = 2048
FIRST_LINE = 1
FIRST_LINE_SAMPLE = 1
SAMPLE_TYPE = PC_REAL
SAMPLE_BITS = 32
BANDS = 1
UNIT = W/M**2/SR/NM
SAMPLE_DISPLAY_DIRECTION = RIGHT
LINE_DISPLAY_DIRECTION = DOWN
End_Object



Played a bit more with some of the OSIRIS images...

havent seen that one on here yet:



it is the WAC version of the spacecrafts shadow on the comet image. Also, there is one patch of stuff that looks like ice above and slightly to the left of Rosettas shadow smile.gif .

The next one is an overexposed view of comet activity... love those images because they show off pretty nicely what makes comets such special small bodies smile.gif



If you zoom in you can also see a huge number of small/faint streaks which i would assume are a bit larger/closer particles leaving the comet?
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chuck0
post Oct 2 2016, 07:57 PM
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Also, since i love color pictures and the global comet images show so few color variations i took a look at the zero phase angle flyby. There is quite a bit of variation across the three bands that are available (Red, Orange, Blue)... registering them is pretty straight forward since it is primarily only a rotation/translation.







It is really a pity that there is only one proper WAC OSIRIS image of that flyby.
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jccwrt
post Feb 7 2017, 01:55 AM
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Most recent release of OSIRIS data is finally working, so I put together a color image taken on March 3. This should be in approximately true color (using images from VIS_BLUE, VIS_GREEN, and VIS_RED), with the caveat that the saturation has been increased a little to make the subtle color variation a little more obvious.

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jccwrt
post Feb 8 2017, 03:06 PM
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A couple of tries at doing some HDR work with the OSIRIS wide-angle far excursion coma studies.



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