Collecting Photons
Techniques
Two part mosaic of the eastern half of the Barnard's loop.
Two part mosaic of the eastern half of the Barnard's loop.
In this page I have collected links to a series of pages or pdf documents where I have outlined some of the techniques used in my processing. The date of the documents reflect the evolution of the processing, and some of the tips I describe I use no more, but might still be useful. Use any of this at your risk and peril!
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Processing a globular cluster (2004)Some tips on preserving colour information while improving the star sharpness. |
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Evaluation of the FD/EOS adaptor (2004) |
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Using a low pass filtered image to enhance subtle nebular features (2005).A complex interplay of bright and dark nebulae with several open clusters. This image has been processed with a procedure I developed to enhance the nebular features in a wide field image. See here for a detailed description. Modified Canon 350D, 30x4' exposures, 135 mm f2.8. The field is about 6° by 4° 18'. See here for an old 40 min exposure on the never forgotten Kodak 2415 (300 mm f4 plus deep red filter). |
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Processing of IC 1848 (2006) |
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Fast multiscale sharpening in Photoshop CS (2008)The unsharp masking operator can be applied serially to enhance details on different scales. This image describes the results of this procedure than can be best implemented as a series o layers in Photoshop. |
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a Narrow Band Imaging with a DSRL camera (2007)A long paper published on the January 2008 issue of Coelum. In Italian. |
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Fighting against the periodic error of a Losmandy mount (2008)Looking south-east from our house. D300, 135 mm f 2.0 composition of two frames exposed for the Moon and background. |
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Fighting differential flexures and mirror shift in the ASA (2008) About detecting and fixing the problem. |
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Fixing stars that are way too bright (2009) |
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Power point presentation prepared for the Monte Amiata 2009 star party (in Italian) |
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Correcting gradients in a desperate case: a new technique (2009) |
Copyright © 1997-2009 by Gimmi Ratto. (May 30, 2009)
