Is this image saveable?

I have an image of Orion that has a pattern overlayed due to a bad dark frame subtraction. I am new to astro imaging and in the steep part of the learning curve. This was taken using a SAC 7B and a Meade 10" LX200GPS.

What I am asking of the gurus here is; Is this saveable? I know it is out of focus slightly, but should it go to the bit bucket and start over?

I am using JASC paint shop pro to manipulate the image, but I cannot remove the pattern overlaying the image.

Any help is greatly appreciated. Thanks.

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well, it depends on what you consider saveable...The banding looks like an electronic interfence signal (ground loop or the like). Also looks like maybe images were added before the dark frames were applied. Were your darks and light frames taken at the same time under identical conditions? do you have original light frames and darks you can post? I was able to clean it up a bit, but I didn't have a whole lot of time to put into it. What I did was to use a section of the dark area in the upper left as a tiny little dark frame. I then aligned the banding over many corresponding tiny sections of the image and subtracted it, allowing the bands to cancel out. If I had the time, I could probably clean it up a lot more, but if you still have original images, it may be much easier to fix it with them.

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I did one tweak in Photoshop. Under the noise filter I selected dust and scratches. Since this filter is designed to eliminate long lines I suspected it might eliminate the artifact grid pattern as well. Sure enough it did. Obviously it lost some data in the image as a result.

I used a radius of 4 pixels a threshold of 3 levels. It cleaned it up as nicely as I could do without over-processing it.

These same settings may be available in other programs as well, don't know.

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