LDN1355 Helping Hand Nebula in LRGB, 600 sec. subframes at -25C by Takahashi FSQ-106ED with CCD Proline FLI PL16083, from Spanish IC Astronomy Observatory, Telescopelive network.
After cosmetic correction of calibrated subframes I realized 2 LRGB integration by PixInSight: the first one by Process > ColorSpaces > LRGB combination, and the second, after integrating RGB masters, by Script > Utilities > LinLRGB operating over L master and RGB just created one.
I thus proceed with a normal post production workflow for each integration: LRGB, LinLRGB, RGB and L master: bg removal, platesolving, Spectrophotometric color calibration, Starmask, Deconvolution manual made, with Bg-mask and PSF obtained by EZdeconvolution, first denoising by EZdenoise, Stretching, 1st Dark Structure Enhancing, Starless and Stars version for each one, 2nd Dark Structures Enhancing just to starless, Color Masking and curves transformation (starless), final denosing and sharpening by NoiseXTerminator and BlurXTerminator (still just starless), .TIFF saving.
I finally rebuilt stars + starless image in Photoshop, applying adjustements to starless and star as separated layers group, melted in Lighten blending mode.
As I wasn’t satisfied nor by LRGB,
neither by LinLRGB results,
expecially because of Luminance and contrast, I thus move for another Photoshop workflow, with RGB starless and RGB stars, respectively associated to L starless and L stars luminance layer group, in luminosity blending mode, with dedicated adjustements and opacities setting.
I found this final postproduction better ther previous results, and thus move to a crop version to better focusing about LDN1355.
Astrobin: https://www.astrobin.com/qb5b5g/D/