Starlight-xpress SXV-M25C Manual do Utilizador descarregar pdf (Página 10)

Handbook for the SXV-M25C Issue 1 June 2004

This includes various options for correcting the colour synthesis for variations in the

lighting conditions, filters etc. Briefly, these items perform the following functions:

1) Daylight Image? – If an unfiltered lens is used, the infra-red content of the

light will tend to produce a Green – Blue shift in the balance. A partial

correction of this bias is provided by selecting this option, but the best option

is to use an infra-red blocking filter when taking daylight shots (see 5 below).

2) Light Pollution Correction: - This option is for deep sky colour images,

where a strong colour bias is often present in the sky background. This option

attempts to return the background colour to a neutral grey.

3) Colour Smoothing Filter: - Applies a low pass filter to the colour data to

smooth out colour noise.

4) Apply Anti-Alias: - Runs a special filter over the colour data to remove

coloured artefacts around sharp edges. This is especially useful for cleaning up

erratically coloured star images.

5) IR Filter Used? – Sets the colour balance to allow for the loss of infra-red

content when using an IR blocking filter.

6) Stretching: - A selection of contrast-boosting options which are preset for

various subjects.

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.

For your first test images, I suggest that you turn on the Anti-Alias option and

possibly the ‘Daylight Image’ option.

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Starlight-xpress SXV-M25C Manual do Utilizador Página 10