![]() The main one is that Starnet is not 100% proof for differentiating stellar vs non-stellar structures. I abandoned the idea of working on the starless image and of combining it with the stars later for several reasons. So I try to translate your steps in my head from Photoshop to Pixinsight in order to compare them. I'm a Pixinsight addict so I am not mastering all the Photoshop techniques (I only use Photoshop for the final steps in my workflow). If needed (I mean, if no improvement occurs) I increase the output black levels for the starless image: I blur a little bit the starless and put it on top of my image, as "Lighten" in PS. I create a starless version of my noisy image using starnet++, which is actually a fantastic piece of software. Hi Mates!I'd like to share with you my denoise and star masking techniques and get some feedback. Use at least 20 flats, 20 flat darks, 20 bias and 20 darks.ħ. Dither when possible to minimize camera defects.Ħ. Sky darkness also comes into the equation for optimal exposure time.Ģ. I usually aim for 6 hours of luminance with my camera, 21.5 SQM sky and 24" mirror. Your optimal subs may be longer or shorter. For the FLI PL16803, this requires at least 15 minute subs. Take as many Luminance subs as possible for the highest stacked SNR for your aperture size, camera type and sky. But you also need to consider reducing noise during acquisition.ġ. I still find I get the best results doing the above. I've tried all sorts of de-noise software and Pixinsight. I then check the final LRGB at the end and repeat the above with very mild fine-tuning on both high SNR areas (positive mask) and low SNR areas (negative mask). When doing RGB, there's another Photoshop control to help minimize color noise. I do this on Luminance and RGB separately. Use Photoshop Camera Raw denoise with adjustments to luminance and detail to smooth noise without affecting the very faintest stars. Play with the levels so there's a smooth mask transition between high and low SNR areas.Ĥ. Stretch the mask using levels so you mask areas having a high SNR. Create a mask layer in Photoshop using the entire image as a mask.ģ. It does not store any personal data.Interesting technique Roberto. viewed_cookie_policy 11 months The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". cookielawinfo-checkbox-performance 11 months This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. cookielawinfo-checkbox-others 11 months This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". cookielawinfo-checkbox-necessary 11 months This cookie is set by GDPR Cookie Consent plugin. cookielawinfo-checkbox-functional 11 months The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". Cookie Duration Description cookielawinfo-checkbox-analytics 11 months This cookie is set by GDPR Cookie Consent plugin. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Sample image, 1600 ISO, cropped areas highlighted I left all of the default settings and just changed the Strength slider as indicated (strength ranges from 0 to 200): What follows are a sample ISO 1600 image shot with my D70 followed by several 100% crops with different levels of noise removal applied. The filter provides a ton of options for fine-grained control of the noise removal process but comes preset with what seem like very good defaults. Restart GIMP and you’ll find a new menu under Filters | Enhance | GREYCstoration. Installing it is as simple as downloading and dropping the plugin into the GIMP plugins directory. That is, until I downloaded and installed the GREYCstoration plugin. The newest version has vastly improved controls for cropping and selections, a foreground selection tool, a healing tool, and better brush management among other enhancements.īut one thing my stock GIMP install didn’t have was a decent noise removal filter. I highly recommend a second look if you haven’t tried it recently. I’ve been using the GIMP image editor (also known as the GNU Image Manipulation Program) (also known as the wonderful, open source, free photo editor with the awful name) a lot lately.
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