Boxcar Filter - help

[steppenwolf]

I am shortly going to receive my S @ N prize and this is a filter wheel and LRGB filter set. Both my CCDs are one shot colour types but I would like to have a go with the set when it arrives and my normal method of using for example an Ha filter is to bin 2 x to destroy the Bayer Matrix. However, I know that I can also destroy the matrix by the use of a 'Boxcar Filter' but MaximDL only implements this filter on the FLAT when carrying out a calibration.

Any thoughts on how I can apply a boxcar filter to my images?

[Kaptain Klevtsov]

Could you just convert from RGB to greyscale in Photoshop?

Kaptain Klevtsov

[markcol]

Steve, looking through the Nebulosity 2 manual: http://www.stark-labs.com/downloads.html

There is a section (12.3) on using narrowband filters with OSC cameras and then using tools in Nebulosity to optimize the results. This may (or may not) be relevant and/or of interest!

I'm currently just standing at the foot of the LRGB/Ha learning curve.....

Cheers

Mark

[steppenwolf]

Could you just convert from RGB to greyscale in Photoshop?

Thanks, KK. I have tried this simple method but found the results from a binned 2 x image to be much crisper.

There is a section (12.3) on using narrowband filters with OSC cameras and then using tools in Nebulosity to optimize the results. This may (or may not) be relevant and/or of interest!

Thanks Mark, this is both interesting and relevant but I guess some experimentation is going to be required. I would prefer not to have to bib my images as this will result in a 25% pixel count which seems rather a waste of resources!

[Psychobilly]

Hi Steve...

Mono camera it is next then

Billy...

[Eddie]

Steve,

to apply a boxcar filter in MaximDL you use the kernel filters:-

Filters -> Kernel Filters

And then

User Filter -> Set

Apply the filter as it is in the below dialogues..

Eddie

[winfij]

If your camera supports 2x2 binning you could use that, or you could just use the 2x2 software bin option in Maxim - it's on the toolbar.

John

[steppenwolf]

Eddie, thanks for those settings. I cannot find a tutorial showing why one would select the values that you have in the boxes you have selected but hopefully I will find one!

John, the binning method (at imaging point not in post processing) has always worked well for me before but I'd like to use all the pixels I have available on the CCD!

[winfij]

In reality, if you're using an Ha filter, you'll only be getting signal though the red pixels, the blue and green will only be adding noise.

Ideally you should convert it to RGB using a method which doesn't mix channels (eg. bilinear) and then just use the red channel.

John