LRGB combining methods

[fwm891]

Hi, I've been imaging using a Baader LRGB filter set and use the batch processing routine to combining, register and calibrate the LRGB images. But using the LRGB routine in PI appears to drop the colour. Combining just the RGB channels is fine, combining the RGB channels and the luminance channel in PixelMath retains the colour but everytime I try using the LRGB tool the colour drops out - any thoughts please?

Link to the files: https://www.dropbox.com/sh/ylp5pwifwbk4o7k/AAASVkFML2VfzUaUmfm0ki1Da?dl=0

[jerryyyyy]

I am a big fan of the AIP LRGB combo script included in PI.  They do the integration in three phases... I think with the LRGB Proc...  Your mileage may vary.  If you get halos, increase the noise it parameter.

I reread your post... I do the script after I have both images stretched... better make sure your L is stretched if your RGB is stretched.  Linear L + stretched RGB sure way to drop the L.

Not sure how all this works in linear mode alone.

[pfile]

are you combining the images when they are still linear? the LRGB routine should be used with nonlinear (stretched) images.

rob

[fwm891]

Thanks both - Rob working with linear images.

I downloaded a PI crib sheet (Jim's PI Cribsheet R23) and I've been working through that today:

Cropped image which is much improved on earlier attempts
 

[pfile]

alright! that's good progress.

rob

[jkmorse]

FWM,

I have made a ton of changes since Rev23, mainly fixing errors and adding new insights from the forum discussions.  Here is a short form of my latest, Rev28 (size limits restrict me to adding a pdf short form here).  If you are interested in the long form Word version, just drop me a line at jkmorse57@gmail.com and I will happily send it along and add you to my distribution list for updates.

Best,

Jim

[jerryyyyy]

Looks good.  Like a preflight for a B747..... Lines 15 & 16, think you are referring to Step 8 (DBE) not Step 10. 

[oldwexi]

But using the LRGB routine in PI appears to drop the colour. Combining just the RGB channels is fine,
combining the RGB channels and the luminance channel in PixelMath retains the colour but everytime I try using the LRGB tool the colour drops out -
any thoughts please?

Link to the files: https://www.dropbox.com/sh/ylp5pwifwbk4o7k/AAASVkFML2VfzUaUmfm0ki1Da?dl=0

Hi fwm891!
It is very simple:  if the color drops your L is to bright. If the colorSat increases your L is to dark.
Therefore i create a synthetic L out of the RGB, do a LinearFit to the L you want to use (using the synth L as a reference)

I do all these kind of processings in linear mode.

Gerald

[jerryyyyy]

I agree.  I linear fit them all while in linear mode. 

[fwm891]

Thanks All, most instructive. See where all this advice takes me now....