IPB

Welcome Guest ( Log In | Register )

Clouds?
jmknapp
post Jul 8 2008, 01:38 AM
Post #1


Senior Member
****

Group: Members
Posts: 1465
Joined: 9-February 04
From: Columbus OH USA
Member No.: 13



Was looking at some MGS imagery:



Kind of a low-contrast scene with some darker splotches here and there. Running that through an equalizing filter gives this image:



Some surprising detail brought out there--it looks to me like there are small clouds casting shadows on the surface. Can that be right? They could be little hills I suppose.


--------------------
Go to the top of the page
 
+Quote Post
 
Start new topic
Replies
siravan
post Jul 8 2008, 01:49 AM
Post #2


Member
***

Group: Members
Posts: 128
Joined: 10-December 06
From: Atlanta
Member No.: 1472



QUOTE
Some surprising detail brought out there--it looks to me like there are small clouds casting shadows on the surface. Can that be right? They could be little hills I suppose.


Likely JPEG lossy-compression artifacts.
Go to the top of the page
 
+Quote Post
jmknapp
post Jul 8 2008, 01:55 AM
Post #3


Senior Member
****

Group: Members
Posts: 1465
Joined: 9-February 04
From: Columbus OH USA
Member No.: 13



QUOTE (siravan @ Jul 7 2008, 08:49 PM) *
Likely JPEG lossy-compression artifacts.


The original images are from IMG files (256 pixels per degree MGS images http://www.msss.com/mgcwg/mgm/), only converted to JPG in the final step. I believe IMG files are lossless.


--------------------
Go to the top of the page
 
+Quote Post

Posts in this topic


Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 28th March 2024 - 06:09 PM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.