Manual page for Siril
A powerful astronomical viewer
A Display Mode viewer is used to improve the visibility of an image, but without altering its pixel data in any way.
- Linear: This is the default mode in Siril. Pixels are displayed from the darkest to the brightest in a linear scale.
- Logarithm: Same than linear instead that here the scale is logarithmic. The operation emphase simultenaously information in faint and bright levels of the image.
- Square root: This transformation, takes the square root of each pixels. The result is close to the logarithm mode.
- Squared: Same than before but using the squared of each pixels.
- Asinh: The inverse hyperbolic sine is the most commonly used, it reproduces the perceptual ability of the human eye, which can accommodate to perceive dramatically different levels of brightness simultaneously. Asinh is close to the logarithm mode but has a better behavior around zero.
- Histogram: This mode increases the contrast of the image by increasing the dynamic range of intensity given to pixels with the most probable intensity values.
This video tutorial shows the different modes you can use to display your images.
Reducing green tint in processed images
This video tutorial shows how to remove the green tint in processed images using the graphical user interface. This function can also be accessed from the command line, with the rmgreen command.
Tutorial for a complete processing
An illustrated tutorial has been compiled to describe the usual processing steps, starting from RAW DSLR images to stacking.
- Convert your images in the FITS format Siril uses (image import)
- Work on a sequence of converted images
- Pre-processing images
- Registration (manual image alignment)
Siril provides a few astrometry tools.