Last updated: 23 May 2002
This page documents image processing software comments, tips, and photos. Contributions welcome.
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Subject: Unsharpe mask Sent: Thursday, September 6, 2001 3:43:35 From: firstname.lastname@example.org (Marius van Leeuwen) I think it is nice to see what Adobe Photoshop unsharp mask can do with a shot of the moon. I send you 3 pictures taken with my etx 90 and sony digital camera. on May 30 2001. The first is the original, number 2, I give more contrast put it in grayscale and give it an unsharpe mask ( you have to try the different handels in that filter for the best results) and number 3 is a closeup also with unsharpe mask. Don't place the shots to smal so you can see the differents Kind Regards Marius van Leeuwen The Netherlands email@example.com
Click on each image to see the full size version.
Subject: Stacking Photographs Sent: Tuesday, December 18, 2001 12:16:09 From: Briguy730@msn.com (Brian Gaines) I have adobe photo shop 6.0, I was wondering how do u combine pictures? u know people say they have stacked photographs how do u do that with adobe photo shop 6.0?Mike here: Windows users use a program called AstroStack, a pretty nice piece of software. Stacking in Photoshop is more a challenge as you have to align the images and play with the various parameters. I've never gotten good results with it. Hopefully someone else will help with this one.
When stacking photos can u only use a video camera. Or can I use my Nikon coolpixMike here: Since stacking works with individual frames, you can use the frames from a video camera or multiple images from a still camera.
Subject: exposure Sent: Wednesday, December 26, 2001 11:02:12 From: BriGuy730@aol.com In the Guest Astrophotography Gallery - Deep Sky, there is a photo of M42 (firstname.lastname@example.org (chan sing) [25 Dec 01]) with this caption: "Attach photo was used selfmade 70mm refractor(disassembly from binocular)+40mm eyepiece.mount on ETX90EC,polar tracking.used casio QV-3500 digital camera,ISO 300,exposure 60sec.3X zoom.used astrostack and photoshop edit.6 frame stack." Does that mean it consists of a total of 5 hours of exposure or total it equals 60 sec? how can the pictuer be so bright from a 70mm telescopeMike here: You should direct your exposure question to the submitter of the photo but I presume he "stacked" six 1 minute exposures. The nice thing about CCD imagers (even those in today's digital cameras) is that they can build up images rather quickly. And stacking adds them to increase brightness and bring out details.
i didnt know he used a cdd imager he said he used a cassio or something...or do all of todays digital cameras have cdd images...i have a nicon cool pix 995...does that have a ccd imager?Mike here: All digital cameras use a form of CCD.
Subject: AstroStack Sent: Wednesday, December 26, 2001 11:40:08 From: Briguy730@msn.com (Brian Gaines) Did u ever figure out y i can only stack two pictures at a time in astrostack? Because I cant figure it out.Mike here: Sorry, I don't use Astrostack. Have you contacted the developer?
Subject: AstroStack Sent: Wednesday, December 26, 2001 11:41:26 From: Briguy730@msn.com (Brian Gaines) When i try to increase the amount of input pictures it goes to ZERO! ANY CLUE ON WHAT TO DOMike here: Sorry, I don't use Astrostack. Have you contacted the developer?
Subject: Stacking on a MAC Sent: Saturday, December 29, 2001 0:18:39 From: email@example.com (Brian Gladstone) I've been an observer of your site for about 6 months now--you do a wonderful job and it is a true service that you provide to us novice astronomers. I was convinced that I should buy the ETX-125EC because of the rave reviews I read here and in amateur astronomy magazines, and was fortunate enough to hit a store that was going out of business so I only paid $400 US. After seeing Mars in all of its glory, I am now focusing on Jupiter and Saturn. I recently puchased an Olympus 3030Z and want to start doing astrophotography. I have tons of pictures, but I would like to clean them up--do you know of any "stacking" programs like astrostack for the MAC? Thank you for your advice. Yours, Brian GladstoneMike here: I wish I did know of an Astrostack for the Mac (Classic or OS X). Doing it in Photoshop is too painful. If you have VirtualPC you could run Astrostack but I've not done that since I find using Windows even more painful.
Thank you for the quick response and advice! I'll tell you if I find something--I'm sure that someone has developed a similar program for the Mac. I will send you some of my photos shortly. It is pretty impressive what one can do with the ETX.
Subject: stacker for Macs Sent: Wednesday, May 22, 2002 21:23:18 From: firstname.lastname@example.org (William L. Schart) I saw the recent post to your site by one Brian Gaines about stacking. From your reply, apparently you are jot aware that there is an image stacking available for Macs: http://keithwiley.com/software/keithsImageStacker.shtml I have done a little with it, seems to work fine. It is a "classic" app, but runs fine in Classic in X. William SchartMike here: I am aware of it (it is on the Astronomy Links page) but I have yet to try it myself.
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