Handbook for the TRIUS PRO-825C Issue 1 September 2020
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7)
Remove Background: -
This option will adjust the sky background
brightness to give an optimum background level.
8)
High Pass filters:
- Automatically sharpen the luminance data to emphasise
fine details. Most useful for sharpening planetary images but will also
increase the noise content.
I suggest that you switch on the Colour smoothing filter and the Anti-alias filter –
you can experiment with the other options as you gain more experience. Now click
on ‘Create image’ and you should see that the grid pattern disappears and is
replaced by colour image data.
If the colour is roughly correct, then all is well. However, the colour decoding is
reliant on the filter pattern being properly registered with the processing software
and this can vary. Colour conversion involves running a software routine which uses
the brightness data from each pixel to generate colour values. As the brightness of
each pixel is related to the colour of light falling on it and the colour filter integrated
onto the pixel during CCD manufacture, we can translate this into true colour data. It
is very important that the software knows the colour filter positions, or the colours
will be translated incorrectly, so the software allows the user to define X (pixel) and
Y (line) offsets to correct this. If the colour is badly wrong, try opening the ‘Set
program defaults’ dialog box and altering the ‘Pixel’ and ‘Line’ offsets. Reload the
raw file and try synthesis again. If it’s still not right, experiment with just a pixel
offset or just a line offset until the colour is good.
There is every reason to expect that the image will be reasonably well colour
balanced, but if it is not, you can adjust the colour in the ‘Set Colour Balance’ dialog
box (Under ‘Colour’ in the main menu).
