Star Alignment once for LRGB?

[dwormuth]

Seems most workflow descriptions have Star Alignment done as an independent step for each filter before image integration and then again with the filter masters before final image combination.

Is there a reason not to Star Align all the files at once so every filter set is done together as one step before moving through the rest of the workflow? Seems like it saves the second round of Star Align once the filter masters are created.

[RickS]

Seems most workflow descriptions have Star Alignment done as an independent step for each filter before image integration and then again with the filter masters before final image combination.

Is there a reason not to Star Align all the files at once so every filter set is done together as one step before moving through the rest of the workflow? Seems like it saves the second round of Star Align once the filter masters are created.

I align all my subs to a single reference and only do it once.  I don't know of any good reason to run StarAlignment more than once on the same data (and applying interpolation more than once would seem to be a bad thing!)

Cheers,
Rick.

[jkmorse]

Just as a counter balance, I do each filter all the way through including Star Alignment, producing a clean single channel master.  Once all of those are complete, I run a second star alignment just on the three masters (either narrowband or RGB).  Thereafter no further alignment is necessary, such as when I create a synthetic luminance master (I never shoot luminance subs, which is a whole different discussion).  That has never produced any issues for me when I do the extra start alignment, though I guess technically it does involve an extra step.  But that is balanced by making it easier to find the various subs I need to complete each channel.

For what it's worth,

Jim 

[pfile]

jim, similar to my other reply, now you've got two interpolation steps. while that's not necessarily going to ruin your images, on first principles it's something to avoid.

rob