Help:Ref chromalign

From Lynkeos
Jump to: navigation, search
←Ref_procstack Top ↑Ref_toolsframe Ref_chromalevels→

Chromatic align tool

Languages English - Français


This tool is used to correct the image from the chromatic dispersion : each color plane is slightly offset from the others, due to atmospheric refraction being different for long and short wavelengths. Each pair of line allows to control the x and y offset for each color plane, with a text field and a slider.

Other buttons are :

  • Auto : tries to find offsets to correct the current image from its chromatic dispersion,
  • Original : displays, when checked, the image as it was when the tool was opened : this allows to check the effect of the offsets.
  • Re-Stack : stacks all images once again, applying the chromatic offsets during the stack. This gives a better correction than applying the offsets to the stacked image.
En-chromalign.jpg

The correction is usually done by offsetting red and blue planes with respect to green ; green offsets remaining at zero. This is not mandatory.

Levels and gamma tool ...