Changes between Version 2 and Version 3 of GPC1_Bias_Pattern_Study

Timestamp:

Sep 6, 2012, 11:21:19 AM (14 years ago)

Author:

watersc1

Comment:

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GPC1_Bias_Pattern_Study

@@ -18 +18 @@
 
 1. The first science image shows a ghosting due to bright pixel columns that cause an oversubtraction in the background level in vertical bands.  This can probably be mitigated by including the static mask data when making the median stack.
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 2. This structure appears to change between each bias frame that I examined, suggesting that this is not something that can be precalculated.  This variation makes sense, as any static feature would be included in the dark model.
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 3. These tests were done on raw images, without any dark correction.  Some thought needs to be done to determine where in the detrending process this kind of correction should be applied.
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 4. Bright extended objects will need to be checked closely to ensure that this does not damage those objects.