From: Walter Lickteig <wflyer@adelphia.net>

Date: November 25, 2006 12:18:53 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] LRGB Processing Help!!


Ray,


Are you shooting with a color camera or B&W with color filter wheel?


If you are shooting with a color wheel then there will be a Red "grayscale" image, a green "grayscale" image and a blue "grayscale image.

Each of these images will become one of the respective channels in RGB.


With respect to luminance data layer, most of the time I leave it at 100% [layers blending mode].  And just to note,your luminance image should been captured with either no filter or a clear filter...


Walt




On Nov 25, 2006, at 9:08 AM, Ray Byrne wrote:

Hi Walt,


Suppose as in my case the various channels don't line up? I'd know how to tackle this with layers but I can't nudge the different channels as PS won't let me :o[


Actually to clarify things for myself  I've annotated your kind instructions below. I am very familiar with PS BTW I use it all the time for work


On 25 Nov 2006, at 15:31, Walter Lickteig wrote:

Ray,


The process is pretty straightforward in Photoshop.  I normally start by opening the Red, Green, and Blue Images.


By images do you mean the combined RGB channel of each of the filtered R, G, B images?





I select the Red Image - make sure the to check Image > Mode > RGB is selected - not grayscale.  Next Open the Layers window and select Channels. You will now see each of the channels - R, G and B.




Then respectively select the Green then Blue Images and paste them into their respective channels.  After assembling the RGB, I save under a new name, e.g. Stars RGB.psd.


Then switch back to the Layers mode, and open, select and then paste the Luminance image in (on top of) the new RGB image.  And finally, select the Luminance Layers Blending mode from the Layers Window.


Do you mean luminance in the blending mode? and do you fiddle with this (ie its transparency) to get a satisfactory amount of colour coming through?


Thanks walt for your help


Ray


That's all there is to it...


Walt Lickteig