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drphilmarshall / SpaceWarps

Science Team Website Development and Analysis
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humvi artefacts #221

Open anupreeta27 opened 9 years ago

anupreeta27 commented 9 years ago

@drphilmarshall http://talk.spacewarps.org/#/subjects/ASW0001rcc we need to investigate this problem and look for a possible solution for this ring like artefact created due to humvi settings

drphilmarshall commented 9 years ago

I'm not sure this is fixable by tweaking the HumVI settings: it's a very bright and very blue object, that I would bet looks odd no matter what color representation you use (as long as that representation is also very effective at bringing out low surface brightness blue features...)

On Thu, Jul 23, 2015 at 9:05 AM, anupreeta27 notifications@github.com wrote:

Assigned #221 https://github.com/drphilmarshall/SpaceWarps/issues/221 to @drphilmarshall https://github.com/drphilmarshall.

— Reply to this email directly or view it on GitHub https://github.com/drphilmarshall/SpaceWarps/issues/221#event-363562916.

anupreeta27 commented 9 years ago

http://talk.spacewarps.org/#/boards/BSW0000004/discussions/DSW00007j7
you can see some other versions of color images made/extracted by the volunteers. perhaps, its also to do with the choice of filters as you can see in that discussion. humvi seems to make the image redder towards the center whereas looking at the sdss and the CADC color image, it seems it should be possible to make the colors look uniform radially. i wonder if experimenting with any of the control parameters whether we can fix this problem and make it look similar to the sdss image?

drphilmarshall commented 9 years ago

We can try, but these images illustrate nicely that you can adjust the image visualization to reject this one object, but at the expense of being able to see faint blue features at high contrast elsewhere in the image. I'd say this image was a great example of why we need to provide the ability to change the view as needed, for a small number of problem cases - as was done here.

On Thu, Jul 23, 2015 at 1:02 PM, anupreeta27 notifications@github.com wrote:

http://talk.spacewarps.org/#/boards/BSW0000004/discussions/DSW00007j7

you can see some other versions of color images made/extracted by the volunteers. perhaps, its also to do with the choice of filters as you can see in that discussion. humvi seems to make the image redder towards the center whereas looking at the sdss and the CADC color image, it seems it should be possible to make the colors look uniform radially. i wonder if experimenting with any of the control parameters whether we can fix this problem and make it look similar to the sdss image?

— Reply to this email directly or view it on GitHub https://github.com/drphilmarshall/SpaceWarps/issues/221#issuecomment-124224753 .