Colour variation, please explain.

• by CyberPaddy66

  I have classed this as a smooth intermediate galaxy with no obvious features but I don't know why there appears to be a colour change between the lighter top right and the darker bottom left, could someone please explain to me why this would happen?

  Posted October 8, 2017 10:57 AM

• by ElisabethB moderator

  The colour variations are due to misaligned filters. There just an optical artifact.

  Posted October 8, 2017 6:30 PM

• by CyberPaddy66

  Yes, saw the worse pic on the space police discussion so will keep an eye out for future errors like this. Is there an easy way to get the corrected pic to classify on here?

  Posted October 12, 2017 3:09 PM

• by Budgieye moderator

  Usually there is raw images somewhere, but this is a GAMA - KiDS image, and I don't know much about them. Can anyone help?

  Otherwise, you can look up in diffferent surveys to see if the same thing happen.

  Posted October 12, 2017 8:49 PM

• by Ghost_Sheep_SWR

  Well ofcourse we can't change the images we are offered to classify.

  But if you want to see other images of this galaxy you can always try and check if it is imaged in other surveys such as SDSS, PanSTARRS or the different surveys on the DeCALS viewer.

  And here you can create three-color images of different surveys using the 'RGB Combined' option and choosing three bands / surveys, including the VSTKIDS bands; http://cutout.icrar.org/psi.php

  Posted October 12, 2017 11:05 PM

• by Budgieye moderator

  Thank you for the info Ghost_Sheep_SWR. I'll repost in Index and GAMA/KiDS featured discussion.

  Posted October 13, 2017 6:38 AM