Comments on: Area 51 at Google Maps vs Space Imaging http://adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging Transmissions from the Little Blue Marble Thu, 17 May 2012 09:16:11 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Confused http://adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging/comment-page-1#comment-126162 Confused Sun, 22 Jun 2008 23:08:58 +0000 http://www.adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging/#comment-126162 I feel like an idoit. I have no idea what you are talking about and im so confused. I feel like an idoit.
I have no idea what you are talking about and im so confused.

]]> By: Patrick McFarland http://adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging/comment-page-1#comment-64 Patrick McFarland Sun, 17 Apr 2005 00:01:00 +0000 http://www.adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging/#comment-64 Wow, cool. Wow, cool.

]]> By: Steven Murdoch http://adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging/comment-page-1#comment-63 Steven Murdoch Sat, 16 Apr 2005 16:17:00 +0000 http://www.adterrasperaspera.com/blog/2005/04/15/area-51-at-google-maps-vs-space-imaging/#comment-63 Alternatively you can get the best of both worlds by combining the chroma channel of the Google image with the luminance channel of the Space Imaging one. I used your transformed versions to produce <a HREF="http://www.cl.cam.ac.uk/users/sjm217/volatile/area51col.jpg" rel="nofollow">such an image</A> and although there are artefacts where there are burned out highlights in the Google image, I think it looks pretty good. The human eye is less sensitive to the spatial resolution of colour than it is to brightness, you can get away with a significant reduction in resolution of the chroma channel and have an image still look OK. JPEG and television take advantage of this fact by applying <a HREF="http://en.wikipedia.org/wiki/Chroma_subsampling" rel="nofollow">chroma subsampling</A>. Alternatively you can get the best of both worlds by combining the chroma channel of the Google image with the luminance channel of the Space Imaging one. I used your transformed versions to produce such an image and although there are artefacts where there are burned out highlights in the Google image, I think it looks pretty good.

The human eye is less sensitive to the spatial resolution of colour than it is to brightness, you can get away with a significant reduction in resolution of the chroma channel and have an image still look OK. JPEG and television take advantage of this fact by applying chroma subsampling.

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