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COG
Cosmetic correction
Prefix of the image names resulting from the calibration.
Start calibration
Pre-process sequence with the above master files, resulting sequence will be in pp_<seq.name> or another prefix given aside.
Once completed, the sequence of pre-processed images is automatically loaded as the current sequence.
The next action for DSLR images would be to debayer the preprocessed images, go to the Conversion tab.
Debayer before saving
Check this option if you want to apply a demosaicing algorithm to your FITS images right after they were preprocessed. By doing this, you skip one manual step which can take some time.
This sets the destination sequence type.
FITS images: one FITS file per image.
SER sequence: one SER file for the whole sequence (limited to 16 bits per channel).
FITS sequence: one FITS file for the whole sequence.
Calibrate all frames
Force calibration of all frames even if marked as excluded.
Output sequence
Calibration is an optional step to apply to a sequence of images.
Calibration
Registration channel:
Layer on which the registration is done. It can only be done on one layer at a time, so on monochrome images.
The (*) sign appearing after the layer's name means that registration data is already available for this layer.
When processing images, registration data is taken from the default layer if available (for RGB images: Green, else fallback to Blue then Red).
Follow star movement
Use this option to use the position of the star(s) found in the previous image as new centre for the current image registration. This allows the selection area to be smaller, registration faster, and accounts for drift or images with a large number of stars.
WARNING: enabling this option requires the registration to not be parallelized, it will run on one CPU core only.
Shift only
Use this option to compute only shifts (so no rotation) even if more than one star is selected. When only one star is selected, this is activated by default.
Match stars in selection
Check this box if you want to perform the Global Star Alignment algorithm within the selected area in the reference image. If no selection are done, this option is ignored.

<b>WARNING</b>: Make sure to draw a selection with a sufficient number of stars.
Minimum Star Pairs:
The minimum number of star pairs a given frame can have in relation with the reference frame. If a given light frame has less star pairs, it will not be registered.
Maximum Stars Fitted:
The maximum number of stars to be searched for in each frame (default 2000). The larger this value, the more stars will potentially be detected, resulting in a longer detection but more accurate registration.
500
<b>Shift</b> is a 2 degree-of-freedom (x/y shifts) rigid mapping, well-suited for images with no distortion, no scaling and no field rotation. It needs at least 1 pair of stars to be matched to define the transformation.

<b>Similarity</b> is a 4 degree-of-freedom (one scale, one rotation and x/y shifts) more rigid mapping than homography, well-suited for images with no distortion. It needs at least 2 pairs of stars to be matched to define the transformation.

<b>Affine</b> is a 6 degree-of-freedom (two scales, one shear, one rotation and x/y shifts) more rigid mapping than homography, well-suited for images with little distortion. It needs at least 3 pairs of stars to be matched to define the transformation.

<b>Homography</b> is the default transformation which uses an 8-degree-of-freedom transform to warp the images onto the reference frame. This is well-suited for the general case and strongly recommended for wide-field images. It needs at least 4 pairs of stars to be matched to define the transformation.

<b>WARNING</b>: The initial star matching uses triangle similarity algorithm, in consequence the minimum of star pairs must be at least of 3 for <b>Shift</b>, <b>Similarity</b> and <b>Affine</b> and of 4 for <b>Homography</b>.
Shift
Similarity
Affine
Homography
Transformation:

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  1. Siril
  2. Siril Application 1.2
  3. English
Use this option to use the position of the star(s) found in the previous image as new centre for the current image registration. This allows the selection area to be smaller, registration faster, and accounts for drift or images with a large number of stars.
WARNING: enabling this option requires the registration to not be parallelized, it will run on one CPU core only.
11 months ago
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read-only
Source string location
src/gui/siril3.glade:21890
String age
11 months ago
Last updated
3 months ago
Source string age
11 months ago
Translation file
string 959