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thanks guys for your comments.
Doug, I could see all these data but when I was trying to bring it the core was completely burnt. So I thought that it would be better to have a cool core even though I'd loose all dim details at the the corners. But what you did with my image is much better than I could get. Thanks.
Alchemy, 158 for offset was the only setting I sould use in order to prevent a histogram sitting to close to the left side. I was trying much lower offset but data was partially clipped. I'm not sure why it happened but I guess it may be because my scope is slow(f/6.8) or I am using Celestron LPS filter.
Theo, it's certanly because of something wrong happened when it was stacked in DSS. I stacked frames for Lagoon with the same settings in DSS and there is nothing similar at the corners. However with stacked Eta Carina I can even visually see this problem in DSS. The bottom line of the image is not straight at the left corner. The image looks like it's folded at the bottom left.
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