tag:blogger.com,1999:blog-6953966401086641771.post4985556594986142707..comments2024-03-29T11:18:01.139+02:00Comments on Astro Anarchy: The power of Tone MappingJ-P Metsavainiohttp://www.blogger.com/profile/17779793358827771439noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-6953966401086641771.post-13152665785677974872015-03-24T09:04:57.221+02:002015-03-24T09:04:57.221+02:00Thanks Andrew!
I saw your photo on FB just before...Thanks Andrew!<br /><br />I saw your photo on FB just before I noticed your comments here. A dream like image, congratulations!<br />J-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-77910397663459569472015-03-24T01:42:44.266+02:002015-03-24T01:42:44.266+02:00http://www.astrobin.com/166688/0/
Hi J-P here'...http://www.astrobin.com/166688/0/<br /><br />Hi J-P here's my latest image IC 4628, processed using your amazing tone mapping method, thanks for sharing it :)<br /><br />Andy, Victoria, AustralaiAndy01https://www.blogger.com/profile/13424595071486680265noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-18231955809096524922015-03-24T01:41:34.226+02:002015-03-24T01:41:34.226+02:00Hi J-P - here's a recent shot of ic 4628 proce...Hi J-P - here's a recent shot of ic 4628 processed using your wonderful tone mapping method, thanks for posting it! http://www.astrobin.com/166688/0/ cheers Andy, Victoria, AustraliaAndy01https://www.blogger.com/profile/13424595071486680265noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-36633149925029614172010-09-03T17:10:22.907+03:002010-09-03T17:10:22.907+03:00Hi Nik,
Thanks for the feedback! What a beautiful...Hi Nik,<br /><br />Thanks for the feedback! What a beautiful and smooth Pelican, great work.<br /><br />BTW. I did some reorganizations to a text of the article. There was some miss placed columns in it, sorry. <br /><br />J-PJ-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-75504659029134189082010-09-03T16:59:38.453+03:002010-09-03T16:59:38.453+03:00again just like to say what a powerful and versati...again just like to say what a powerful and versatile technique this<br /><br />Ive just processed my latest image the Pelican Nebula and the final image was definitely <b>much</b> better than i could manage with more "conventional" processing techniques<br /><br />im thinking of trying this with LRGB images too but not sure how to handle star colours yet<br /><br /><br /><a href="http://www.pbase.com/njh542/image/128045240" rel="nofollow">Pelican <br /></a>nikhttp://www.pbase.com/njh542noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-60294907824606863072010-08-17T11:47:42.002+03:002010-08-17T11:47:42.002+03:00Thanks Nik,
NGC6888 looks really good!
J-PThanks Nik,<br /><br />NGC6888 looks really good!<br /><br />J-PJ-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-71423482065428040652010-08-17T09:47:07.902+03:002010-08-17T09:47:07.902+03:00HI yes i found this too be a useful strategy as we...HI yes i found this too be a useful strategy as well<br /><br />e.g<br /><br />http://www.pbase.com/njh542/image/127518938<br /><br />best wishes<br /><br />NikAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-23681731272391292252010-01-23T13:57:12.681+02:002010-01-23T13:57:12.681+02:00Great! That was some very important information 8-...Great! That was some very important information 8-). Thanks again!<br /><br />GingeUnknownhttps://www.blogger.com/profile/11988028900412424099noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-36706977651599767472010-01-23T13:55:43.810+02:002010-01-23T13:55:43.810+02:00I like to add one thing here.
The "Tone Mappi...I like to add one thing here.<br />The "Tone Mapping" method works well only to images with perfect calibration!<br />It's powerfull method to dig out very faint information. If lights are not well calibrated, it'll dig out all the flaws too.J-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-63150544486351193752010-01-23T13:53:27.761+02:002010-01-23T13:53:27.761+02:00Yes, flats need to be bisas subracted, or if long ...Yes, flats need to be bisas subracted, or if long exposure time flats, then dark subracted with darks taken with same exp. time.<br /><br />Dark frame includes bias information. If you subract bias from dark, you'll end up adding it back to images with flats!!<br /><br />Bias is used with darks only to scale them, if shorter exposuretime is used for lights, than darks.<br /><br />J-PJ-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-26810622969514530172010-01-23T13:40:15.131+02:002010-01-23T13:40:15.131+02:00Thanks for the tip J-P! I didn't know I was su...Thanks for the tip J-P! I didn't know I was supposed to bias-subtract my flats. Do you also subtract biasfrom your darks even when you use darks that have the same sub-exposure time as you lights?<br /><br />GingeUnknownhttps://www.blogger.com/profile/11988028900412424099noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-32588372766956487452010-01-23T13:12:53.147+02:002010-01-23T13:12:53.147+02:00Hi Jan!
Your images looks great, very good work.
...Hi Jan!<br /><br />Your images looks great, very good work.<br />Low noise is combination of many things. KAF 8300 CCD has a low dark current, carefull calibration with good bisas subracted flats and a great number of subframes for bias and darks. Usually I shot about 100 bias frames, 20-30 darks and 20 flats. Only falts are reshoot every imaging session for every filter used.<br /><br />In photoshop, I use NoiseNinja for noisereduction to Starless channels. In final image a mild noisereduction is added at the end.<br />NoiseNinja is a good commercial noise reduction software. If you going to use any noisereduction method, take it easy. Too much reduction and you image will look very unnatural. <br /><br />Hope this helps,<br />J-PJ-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-56780657795666790262010-01-23T12:58:01.530+02:002010-01-23T12:58:01.530+02:00Hi J-P! I'm a great fan of your work and have ...Hi J-P! I'm a great fan of your work and have been using tone-map since october. I am really fresh at this hobby and have a lot to learn but I have had enough clear weather to tone-map 3 images since October. The last ones are here:<br /><a href="http://farm5.static.flickr.com/4022/4265422939_2d2856af5b_b.jpg" title="additional information" rel="nofollow">IC1795 in HST</a> and <a href="http://farm5.static.flickr.com/4028/4266170106_1a48030231_b.jpg" title="additional information" rel="nofollow">IC1795 in CFHT</a><br /><br />What really puzzles me is that you manage to get very little noise from a relatively short total exposure time. Take your latest tabpole-image for instance. Wonderful, - with only 1800 sec total SII and 2400 sec OIII. How?<br /><br />Also, everytime I add the enhanced Ha I find that the image gets really washed out and I have to correct with curves and saturation. Am I doing things right here?<br /><br />Thanks for putting up the .pdf!<br /><br />Regards,<br />GingeUnknownhttps://www.blogger.com/profile/11988028900412424099noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-18313844213356686632009-11-09T21:01:43.429+02:002009-11-09T21:01:43.429+02:00Good to hear Vesa.
The image of NGC 7000 is stunni...Good to hear Vesa.<br />The image of NGC 7000 is stunning!<br />I like the delecate color scheme.J-P Metsavainiohttps://www.blogger.com/profile/17779793358827771439noreply@blogger.comtag:blogger.com,1999:blog-6953966401086641771.post-20760819387731757992009-11-09T19:51:11.111+02:002009-11-09T19:51:11.111+02:00I've just started to use this method after lea...I've just started to use this method after learning how to do it. And I have to say it works fantastic! My best success so far can be found here:<br /><br /><a href="http://www.vkastronomy.com/entry_2009.08.23.07.00.html" rel="nofollow">[NGC7000]</a><br /><br />Thanks for sharing the method!Vesa Kankarehttp://www.vkastronomy.comnoreply@blogger.com