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RE: [APML] Photoshop tip for healing star elongation- is this useful?



Tony, interesting concept, I tried this one time with a galaxy image, and yeah, the stars were great, but the detail in the HII regions and stellar associations was still a blur.  It seems obvious, but probably the best solution is to blow off the originals an retake them!
 
Chris
-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On Behalf Of Tony Hallas
Sent: Monday, December 23, 2002 6:41 PM
To: astro-photo@seds.org
Subject: Re: [APML] Photoshop tip for healing star elongation- is this useful?

Alan,
 
    At first blush it might appear that this works, but there is really no way you can make a new layer (just a copy of the first image that sits on top of it) and MOVE it in any direction without impacting the integrity of the original image. Ron even admits that more than a very minor shift will impact the image... it's my observation that ANY movement is noticeable in something like a 16 X 20 enlargement... a lot is hidden in the 72 dpi resolution of a monitor... when you go to print, the stars might be better, but the sharpness of the image will be compromised... I have a better idea that someone like Matt can wrestle with... first select all the stars, then paste them to a transparent layer... NOW shift that layer... the stars will improve but everything else will be unaffected. This will work but shifting everything won't. As an aside, this technique has been well known on the APML for quite some time, but I never thought of first selecting the stars and pasting them to a tranparent layer...
 
    Have a Great Holiday,
 
        Tony