This image was captured with an OSC camera and a single Ha/OIII dual-band filter using Virtual Filter Slots (VFS), an open-source project I developed for ASIAIR and Raspberry Pi Pico.
The Ha and OIII integration times are listed separately, but every exposure recorded both bands. For each final channel, I used the exposures taken at its matching focus position.
The channels were Linear Matched before combination. Color was built with a ForaxX-style HOO palette:
R = Ha
G = f*Ha + (1-f)*OIII
B = OIII
with
f = (Ha*OIII)^(1-Ha*OIII).
A custom dynamic luminance was used to preserve Hα detail while retaining strong OIII structures:
f = OIII*(1-Ha)
L = f*OIII + (1-f)*Ha.
HDR Multiscale processing was used to enhance structural detail and control the brightest regions. Noise reduction was applied through an inverted luminance-based mask, mainly targeting low-SNR areas while protecting fine filaments. Final processing included mild star reduction, highlight control, background adjustment and saturation tuning.
Learn more about VFS:
https://kirpersidsky.github.io/rp2040-efw-hid-emulator/
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