Re: OSC Processing problem


Nov 21, 2017

 


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#61747 Nov 21, 2017

Got a silly problem.I have an Atik 4000OSC camera which I have used in the past to capture mainly comets and produced OK images processed with Maxim.Used it recently and can't get any colour in the stars, may be doing�� / not doing something I did previously as it's been a while since I used it.I'm using the boxcar filter on flats and colour converting images but only getting white stars.The images do alter when colour converted and can be split into 3 colour channels which appear as RGB but recombining them gets white stars, measured the pixels and the stars aren't burnt out.Using the standard RGB setting as my camera isn't listed specifically.Curiously if I use the " extract bayer " thingy to reduce the image to half size all the stars become coloured.I seem to have developed a mental block so any advice appreciated.

Dave



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#61764 Nov 25, 2017

The filter will destroy the colour.



You need to colour convert first, and then apply filtering afterwards.



You have to understand that the 'colour' in OSC cameras is encoded as

the values on adjacent pixels. So the matrix of pixels typically has

something like:



RGRGRGRG.....

GBGBGBGB....

RGRGRGRG...

GBGBGBGB..

....



Anything that 'averages' the image before the colour data is extracted,

gets rid of the number differences between the pixels that 'are' the

colour data....



The same applies to things like dithering, which move the data.



You can subtract a dark frame, but anything else risks affecting the colours



> Got a silly problem.

> I have an Atik 4000OSC camera which I have used in the past to capture mainly comets and produced OK images processed with Maxim.

> Used it recently and can't get any colour in the stars, may be doing / not doing something I did previously as it's been a while since I used it.

> I'm using the boxcar filter on flats and colour converting images but only getting white stars.

> The images do alter when colour converted and can be split into 3 colour channels which appear as RGB but recombining them gets white stars, measured the pixels and the stars aren't burnt out.

> Using the standard RGB setting as my camera isn't listed specifically.

> Curiously if I use the " extract bayer " thingy to reduce the image to half size all the stars become coloured.

> I seem to have developed a mental block so any advice appreciated.



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