As can be seen in the video, the color calibration is performed when image data are linear, which is very useful help of a transfer function display ( ScreenTransferFunction ). ;
Currently there is a tool which automatically cut the same, but with a few clicks. PixInsight Core is available in 1.5 from a few days ago with the name of ColorCalibration .
Currently there is a tool which automatically cut the same, but with a few clicks. PixInsight Core is available in 1.5 from a few days ago with the name of ColorCalibration .
ColorCalibration The idea is based on using as reference two types of sub images (or previews). First, the white reference and second reference sky.
The reference targets can be for example the total light emitted by a galaxy, since we can safely say that most of all light sources emitting in the continuum (mainly stars). And then a sky background reference (background), here always assumed to be neutral.
The reference targets can be for example the total light emitted by a galaxy, since we can safely say that most of all light sources emitting in the continuum (mainly stars). And then a sky background reference (background), here always assumed to be neutral.
In the picture outlined in the video blog is more difficult to find a white reference, because it is an object of a different nature. Ie not emit the photographed object in the continuous spectrum, but it does so in more specific wavelengths (emission lines). For this reason, the user interacts with the global statistics of the sky background, instead of using a white reference when calibrating the overall color of the image.
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