Recently we talked about making files availible so people could have a try at image processing.
I have uploaded a image file of NGC 5189.
file is zipped and is 144kb, unzipped size is around 900kb.it is in BMP format so should be able to be viewed by most if not all image processing software.
here is the address http://members.iinet.net.au/~westsky/NGC5189.zip
The image is 50 images x 30secs
taken with a C11 at f6.3
Go ahead and have a go and let us see what your results are like.
cheers
David.
Mike, in PS after you've mucked around with the levels and colour curves a bit, try outlining the nebula with the lasso (lightish feather20 - 30ish), invert the selection, reset the black point using levels, invert the selection again and try a very light (0.7 pixel) gaussian blur, then muck around with the individual colour curves or visa versa (ie curves then blur). Then deselect.
I'll have another serious go tonight with some masking.
Cheers
Paul
Last edited by [1ponders]; 06-04-2005 at 01:01 PM.
If you're going to try it in Registax first for waveletting and colour adjustment then go "Select" - (navigate to the folder the bmp is stored in) - "Files of Type" choose bmp - then open. Registax will then go straight to the waveletting page.
Had another go tonight. For sake of realism, I kept all processing operations global (applied to entire image). The two more unusual things I've used:
1) GIMP's convolution matrix to manually shift the red component up by 1.2 pixels,
2) the "Dilate" filter to highlight the structure of the nebula. The joining of the two close stars in the nebula is an undesired artefact of this filter.
Rest is just several level tweaks and Gaussian blurs.
Hey Ken there's no such thing as cheating in image processing, whatever you can do to make the image good is what counts,
by the way the prize is sitting in the middle of 5189 you have to go pick it up :-))
Originally posted by westsky Janos, I might have to give Gimp a try for image processing, it looks like you added a luminance layer, very nice.
David.
If you manage to make friends with the quirky interface (not nearly as quirky since v. 2.0), the Gimp is really a joy to use. I have limited experience with Photoshop but when I do use it I "think in Gimp". They seem very similar in terms of capability. On a technical note: with the GIMP you are limited to 8 bits per colour, in P-Shop to 16bits. There is a Gimp-on-steroids called CinePaint that is used by some Hollywood studios. It supports 32 bits per colour. And it's as free as the Gimp.
Originally posted by westsky Hey Ken there's no such thing as cheating in image processing, whatever you can do to make the image good is what counts,
O.K. I gave it a go in PaintShop Pro 4. I don't like the outcome!
From the original I raised the Brightness and contrast to find the Nebulous gas then highlighted all the gas. Then I highlighted the stars and added a smidge of the right colour to them. When finished I brought the brightness down to -20 and the contrast back down to 0. I think it looks terrible but it was fun trying.
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