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Hyperion Image Products
Exploitcorporati...
post Oct 4 2005, 05:08 AM
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Global mosaic:
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...if you don't like my melody, i'll sing it in a major key, i'll sing it very happily. heavens! everybody's all aboard? let's take it back to that minor chord...

Exploitcorporations on Flickr (in progress) : https://www.flickr.com/photos/135024395@N07/
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edstrick
post Oct 5 2005, 10:10 AM
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I think they do a simple automatic contrast stretch. If the orignial data is 8-bit, (some of it is 16), and say 5% of the data is below a data number of 43, and 2.5% is above 229 (arbitrary numbers for example purposes), they do a linear contrast stretch mapping 43 to zero and 229 to 255, saturating the bottom 5% of the grayscale black and top 2.5% of the grayscale white.

I don't know the actual percent values.

That's why pics of small moons against black sky saturate them white.

Limb shots of a moon have black sky and that drives the low end stretch.. if the shot is entirely on sunlight moon, the bottom 5% point might be something like 113 and get mapped to black.
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Posts in this topic
- Exploitcorporations   Hyperion Image Products   Oct 4 2005, 05:08 AM
- - Exploitcorporations   9-Frame high resolution:   Oct 4 2005, 05:10 AM
|- - Malmer   started on the same composite but did it in color....   Oct 5 2005, 09:20 AM
- - Exploitcorporations   Global with 9-frame inset:   Oct 4 2005, 05:12 AM
|- - dilo   Impressive work!   Oct 4 2005, 06:02 AM
- - RPascal   Very nice mosaics, congratulations! When look...   Oct 4 2005, 03:55 PM
|- - Exploitcorporations   QUOTE (RPascal @ Oct 4 2005, 08:55 AM)Very ni...   Oct 4 2005, 07:39 PM
- - Exploitcorporations   21-frame (hires inset)   Oct 4 2005, 07:41 PM
|- - tedstryk   QUOTE (Exploitcorporations @ Oct 4 2005, 07:4...   Oct 4 2005, 07:44 PM
- - Exploitcorporations   Hires in context(detail):   Oct 4 2005, 07:47 PM
|- - jmknapp   QUOTE (Exploitcorporations @ Oct 4 2005, 03:4...   Oct 5 2005, 11:44 AM
|- - Malmer   QUOTE (jmknapp @ Oct 5 2005, 01:44 PM)One thi...   Oct 5 2005, 12:18 PM
|- - jmknapp   QUOTE (Malmer @ Oct 5 2005, 08:18 AM)It has t...   Oct 6 2005, 12:23 AM
|- - AndyG   QUOTE (jmknapp @ Oct 6 2005, 12:23 AM)Interes...   Oct 11 2005, 09:27 AM
|- - jmknapp   QUOTE (AndyG @ Oct 11 2005, 05:27 AM)Yes...th...   Oct 11 2005, 12:49 PM
|- - AndyG   QUOTE (jmknapp @ Oct 11 2005, 12:49 PM)I wasn...   Oct 11 2005, 03:30 PM
- - edstrick   I think they do a simple automatic contrast stretc...   Oct 5 2005, 10:10 AM
|- - Malmer   QUOTE (edstrick @ Oct 5 2005, 12:10 PM)I thin...   Oct 5 2005, 11:25 AM
- - Malmer   I finally finished a color panorama using UV IR GR...   Oct 9 2005, 09:34 PM
|- - RPascal   QUOTE (Malmer @ Oct 9 2005, 10:34 PM)I finall...   Oct 10 2005, 04:07 PM
|- - tedstryk   QUOTE (RPascal @ Oct 10 2005, 04:07 PM)Excell...   Oct 10 2005, 04:57 PM
|- - Malmer   QUOTE (tedstryk @ Oct 10 2005, 06:57 PM)Using...   Oct 10 2005, 05:20 PM
|- - tedstryk   QUOTE (Malmer @ Oct 10 2005, 05:20 PM)What so...   Oct 10 2005, 05:32 PM
|- - Bjorn Jonsson   QUOTE (Malmer @ Oct 10 2005, 05:20 PM)What so...   Oct 10 2005, 05:57 PM
|- - tedstryk   QUOTE (Bjorn Jonsson @ Oct 10 2005, 05:57 PM)...   Oct 10 2005, 06:55 PM
|- - Malmer   QUOTE (tedstryk @ Oct 10 2005, 08:55 PM)Regis...   Oct 10 2005, 10:30 PM
|- - tedstryk   QUOTE (Malmer @ Oct 10 2005, 10:30 PM)Ill giv...   Oct 11 2005, 12:38 AM
|- - Malmer   QUOTE (tedstryk @ Oct 11 2005, 02:38 AM)One w...   Oct 11 2005, 10:44 AM
- - volcanopele   Hyperion has kind of an orangish, golden color.   Oct 10 2005, 05:28 PM
- - Phil Stooke   Love that big colour mosaic. One day I may get ar...   Oct 11 2005, 02:05 PM
- - elakdawalla   QUOTE (Phil Stooke @ Oct 11 2005, 07:05 AM)Aa...   Oct 11 2005, 02:42 PM
- - JRehling   QUOTE (elakdawalla @ Oct 11 2005, 07:42 AM)Yi...   Oct 11 2005, 03:37 PM
- - ugordan   QUOTE (JRehling @ Oct 11 2005, 05:37 PM)Cassi...   Oct 11 2005, 03:47 PM

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