Another re-edit M51

[MartinB]

Sorry about this but in the absence of any stars all I can do is work on developing processing skills and routines. This is an M51 image from last March. It was with an ED120 on a GPDX mount and it was very windy. Stars were deformed in all the subs due to the wind so the processing was a bit of a rescue job, quite a challenge. Have been trying out deconvolution routines in CCDsharp which is free and very easy to use. This is the main change to the original but have treated the colour differently. I definitely think the resolution has been improved with the reprocess.

Re-edit

Original

[MartinB]

Hmm, shows up better with a bigger image scale

[Kaptain Klevtsov]

Do you do a deconvolution on the subs individually, or on the stack?

Kaptain Klevtsov

[anthony]

A second to 2nd KK's Question!

Fine images, the both. Preference to the reprocess though.

[MartinB]

The stack. I think you need the better s/n ratio, plus the combined image should more accurately show the convolution that needs deconvolving, if that makes sense. Apart from this, the deconvolve with CCD sharp takes about 5 mins on my machine so doing on the subs wouldn't be feasible.

I have also tried deconvolving with ImagesPlus and Maxim. CCDsharp is much neater and doesn't involve inputing a set of variables. Just sample an appropriate selection of stars and it does the rest. The key is not overdoing it.

[FLO]

A clear improvement Martin 8)

[mpeniak]

Great images Martin! Re-processed one looks much clearer to me with higher resolution.

Martin

[anthony]

Hi Martin

After seeing this reprocess I went and downloaded ccdsharp. Had a quick play - easy, straightforward and it works!

Cheers for the prompt!

Anthony

[MartinB]

Works really well Ant. Only trouble seems to be it is a bit fussy about the fits it will except. Doesn't like floating points fits. Maxim can save as SBIG format fits which it does like (not surprisingly)

[anthony]

Saw that - just resaved as 16 bit.

Brought out more structure in an M57 shot, but at 3 iterations started to show artefacts.

Ant

[MartinB]

Apparently saving as 16bit integer is ok if you DDP it first otherwise you can loose some data.