From: "John" <jbuckley1@mac.com>

Date: June 11, 2010 9:59:45 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: NGC 4565 Gradient removal



Hi Milton,


Very nicely done. The reprocessed image looks much better than the previous version. I am interested to see the nature of the original gradient. Do you have a gradient challenged "before" to go with your after?


Thanks,

John B


--- In Astro_IIDC@yahoogroups.com, "milton_aupperle" <milton@...> wrote:


I've been reprocessing a bunch of DSO images to test out the new Gradient removal code, and also improve them. 


As an example, here is my original version of NGC 4565:


http://www.outcastsoft.com/AstroImages/NGC4565_MJA_20100307.jpg


Because of the gradient, I lowered the background to hide it, which darkens everything out.


Here is the new version which has gradient removal applied:


http://groups.yahoo.com/group/Astro_IIDC/files/DSO/NGC4565_20100306.jpg 


Because this suppressed the gradient to minimal amounts, I could stretch the image a lot further.