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Cloudwatcher

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Posts posted by Cloudwatcher


  1. Earlier today I was reading The Universe According to Patrick Moore in the Jan. issue of Sky at Night. He refers to Auriga as sitting in a rich star field due to one of our Galaxy's spiral arms running across this constellation. I was reminded of seeing your image on the Forum and thought I'd take a closer look. Couldn't find it at first.............things move so fast on SGL...... but finally tracked it down here in 'widefield'.

    I think the gradient concentration referred to by JamesF might in fact be the spiral arm mentioned above. A check on Starry Night Pro seems to confirm this........see attached screen shot. This compares well with your image once the red background is reduced.

    Good capture. :icon_salut:

    post-849-0-49386700-1357483915_thumb.png

    post-849-0-66650200-1357483970_thumb.jpg


  2. .......the very faint stuff, like the outermost arms, stay smooth and noise free when you've taken away the background glow. In mine I just get a few random grey blotches of noise. Is this something where 16 bit would help?

    The short answer is,I don't know. :grin:

    I do most of my stuff in 8bit mode in Photoshop mainly because in higher modes some of the tool are not available.The finished image can be converted to 16 or 32bit after but to be honest unless I zoom in I can't see much difference.......perhaps I should go to Specsavers! :glasses9:

    Blotches of noise can be treated by isolating in a separate layer and using the blur tools in Photoshop,reducing,in the case of the galaxy arms, the noise to a smoothness that is acceptable.

    A quick overdone example attached by way of illustration........this may result in the loss of a few stars if your not careful. :icon_redface:

    post-849-0-56113200-1356976470_thumb.jpg


  3. My last post was,of course, just a bit of (over sharpened) fun but on a more serious note there is quite a bit of colour to be found in the original image.

    Never having used GIMP I don't know what tools you have at your disposal so it's a bit difficult to give detailed advise that you can use. I assume levels are available and a method for varying saturation but possibly not the Dodge and Burn facilities. The latter are very handy for bringing out detail when you 'go deep' on an enlarged section of an image.

    By way of illustration the first image below shows a section where basic Levels and Saturation were used,the second is where Dodge & Burn tools,on an enlarged view,have been put to use. Really all one is doing is changing the contrast between light and dark areas but with more control at your fingertips.

    post-849-0-70532300-1356816588_thumb.png

    post-849-0-03869400-1356816675_thumb.png


  4. NGC7635Bubblejpeg 1.psd

    Hi CLoudwatcher, wow, that's really amazing in terms of the extra nebula detail you got there. Could you maybe run me quickly through how you did it?

    It's fairly easy to do but rather difficult to explain........perhaps I should keep history notes.

    I'll try to give you a brief rundown from memory with added pictures! :grin:

    As I recall,the bubble was isolated on the original image and the background tweaked with the levels and exposure tools (pic.1).

    Colour Balance,Hue/Saturation was then applied shifted towards the red to bring up the background nebula......all a bit hit and miss (pic.2).

    Next,a layer was made of the area to be cropped and with the background isolated,worked on with the Dodge,Burn and sharpen tools.......again,all hit and miss especially as I'm not very good on nebulae :embarassed: (pic.3)

    Finally,some blue photo filters were applied (warming and cooling) and the image cropped (pic.4). Phew!

    I hope that is of some help but the best advise I can give is to just play around with all the tools available till a result is achieved that you like. :rolleyes:

    post-849-0-74696100-1356528789_thumb.jpg

    NGC7635Bubblejpeg 2.psd

    NGC7635Bubblejpeg 3.psd


  5. NGC7635Bubblejpeg 1.psd

    Hi CLoudwatcher, wow, that's really amazing in terms of the extra nebula detail you got there. Could you maybe run me quickly through how you did it?

    It's fairly easy to do but rather difficult to explain........perhaps I should keep history notes.

    I'll try to give you a brief rundown from memory with added pictures! :grin:

    As I recall,the bubble was isolated on the original image and the background tweaked with the levels and exposure tools (pic.1).

    Colour Balance,Hue/Saturation was then applied shifted towards the red to bring up the background nebula......all a bit hit and miss (pic.2).

    Next,a layer was made of the area to be cropped and with the background isolated,worked on with the Dodge,Burn and sharpen tools.......again,all hit and miss especially as I'm not very good on nebulae :embarassed: (pic.3)

    Finally,some blue photo filters were applied (warming and cooling) and the image cropped (pic.4). Phew!

    I hope that is of some help but the best advise I can give is to just play around with all the tools available till a result is achieved that you like. :rolleyes:


  6. The games still afoot (30cm) Watson! :grin:

    As Ron says the problem is trying to match FOV and orientation when comparing widefield images of this nature. I trawled through Crab images and came across this one,which,when reorientated,does show some similarities in the star patterns,allowing for the difference in level of detail. Additionally,the 'blob' could be the core only of M1 due to short expose time.

    Of course this is all hypothetical but it's the thrill of the chase that counts. :biggrin:

    post-849-0-32027700-1355092972_thumb.jpg

    post-849-0-28685100-1355093006_thumb.jpg

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