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About Ju_Cooper

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  1. This is definitely true, but can be almost completely avoided with the Morphological Transformation method by using a good star mask. Unfortunately, I can't seem to make a decent mask in PixInsight: I end up making the mask in Photoshop and transferring it back to PixInsight.
  2. I know that the question was how to do this in Photoshop, but I've recently been playing with PixInsight's Morphological Transformation process for this type of issue. For example these trailed stars: Were transformed with these settings: With this result: This was a more exaggerated example than I would normally use it for and some of the residual background noise has been "eroded" out of existence (I had clipped the background a lot deliberately in the example so that the trailed stars were more obvious). The shape of the structuring element needs quite a bit of trial and error to get right, but in general the the white part of the structuring element should be parallel to the long axis of the trail. In regular use it is pretty much essential to mask the image so only the stars are transformed.
  3. Really excellent images :) orbiting platform quality!
  4. You're very welcome Sandra. For PS there are many books, and an awful lot of tutorials on the internet. Most important is to practise—the more you try the more you will discover
  5. Hi Sandra, there is only so much possible, but I've had a go. Did a bit of wavelet sharpening in Registax, then brought it into Photoshop for a gentle high pass sharpen and Shadows & Highlights manipulation. Did a masked curves correction to reduce some of the central overexposure and reduce some of the the vignetting at the edges.
  6. I'm not sure whether I like this or not :( It's an HDR fusion of Canon 450D DSLR shots (5s and 1/30s, ISO 100) at prime focus of a Sky-Watcher 150 Explorer. Fusion in Photomatix Pro with further processing in Photoshop. Waxing crescent Moon 26 January 2012 HDR fusion with earthshine by Julian Cooper, on Flickr
  7. Mark Thompson said some very nice things that modesty prevents me from repeating :)
  8. Thank you very much for the kind comments. I was even more chuffed because this image was posted on the "wall" on BBC Stargazing Live last night
  9. Thank you very much for the kind comments. :) roscoe: I've been taking pictures of the Moon for getting on for 18 months. Started afocal with a spotting scope, but now tend to use DSLR prime focus on a Newtonian reflector. I've been trying stacked video for the Moon and planets in the last few months with an uncoventional afocal technique through a digital compact camera. For deep sky I use my unmodded 450D prime focus and a 550D would seem a natural successor to that level camera. An unmodded camera is fine for lunar work and a lot of deep sky stuff, but the camera isn't sensitive to the important hydrogen alpha part of the spectrum so for the very best DSLR deep sky images modding helps. There are different forms of modding (removing the filter or replacing it), which I gather will affect normal daylight use, but this allegedly can be compensated for with a custom white balance. Cooled CCD cameras with narrowband filters are the way to go if you wanted to take things to the next level in deep sky. I'll carry on dreaming I'm not sure there is much to choose from between the 550D and 600D, but the movable LCD screen might be useful if the scope is in an awkward position. I've never used it, but if the newer Canons are like mine I believe you can monitor the live view on a computer via a cable. Hope this helps
  10. Got up early to try stacking some DSLR shots of the Moon. 40 Canon EOS 450D shots 1/80s ISO100 prime focus Sky-Watcher 150 Explorer Newtonian. Baader Neodymium filter. Cropped in Adobe Camera Raw then Registax for alignment, stacking (drizzle) and wavelets. Post-processing in Photoshop. Waning gibbous Moon 07.30 UT 15 January 2012 by Julian Cooper, on Flickr
  11. I haven't found that to be a problem, although I do crop a little from the edges where there are stacking artifacts (rather than distortion). I've just noticed that the picture in my original post isn't showing so I've linked it direct below:
  12. Excellent image—inspiring me to have a crack at it
  13. 22 pane mosaic from stacked afocal video taken around 7am 14.12.11. Canon Digital Ixus 800IS. 10mm eyepiece. Sky-Watcher 150 Explorer Newtonian. Processing in Registax 6 and Photoshop. Stitched in Microsoft ICE. Colour blend layer from separate DSLR shot. 22 pane mosaic of the waning gibbous Moon 0705 UT 14 December 2011 by Julian Cooper, on Flickr
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