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Revision as of 23:51, 27 October 2014

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Message definition (Siril:Tutorial stacking)

* Median Stacking
This method is mostly used for dark/flat/offset stacking.
The median value of the pixels in the stack is computed for each pixel.
As this method should only be used for dark/flat/offset stacking, it does not take into account shifts computed during registration. The increase in SNR is proportional to <math>0.8\sqrt{N}</math>.
* Pixel Maximum Stacking
This algorithm is mainly used to construct long exposure star-trails images.
Pixels of the image are replaced by pixels at the same coordinates if intensity is greater.
* Pixel Minimum Stacking
This algorithm is mainly used for cropping sequence by removing black borders.
Pixels of the image are replaced by pixels at the same coordinates if intensity is lower.

Median Stacking

This method is mostly used for dark/flat/offset stacking. The median value of the pixels in the stack is computed for each pixel. As this method should only be used for dark/flat/offset stacking, it does not take into account shifts computed during registration. The increase in SNR is proportional to [math]\displaystyle{ 0.8\sqrt{N} }[/math].

Pixel Maximum Stacking

This algorithm is mainly used to construct long exposure star-trails images. Pixels of the image are replaced by pixels at the same coordinates if intensity is greater.

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Revision as of 23:51, 27 October 2014

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-After that, the result is saved in the file named below the buttons, and is displayed in the grey and colour windows. You can adjust levels if you want to see it better, or use the different display mode. In our example the file is the stack result of the 80% best files, i.e., 96 over 119 files.
+* Median Stacking
+This method is mostly used for dark/flat/offset stacking.
+The median value of the pixels in the stack is computed for each pixel.
+As this method should only be used for dark/flat/offset stacking, it does not take into account shifts computed during registration. The increase in SNR is proportional to <math>0.8\sqrt{N}</math>.
+* Pixel Maximum Stacking
+This algorithm is mainly used to construct long exposure star-trails images.
+Pixels of the image are replaced by pixels at the same coordinates if intensity is greater.