Narrowband RGB-separation set for testing NegPy's planned "RGB (3 separate exposures) mode" (see marcinz606/NegPy roadmap).
One 35mm frame, Sony a7CR (ILCE-7CR), 61 MP (9600×6376), on a copy stand with a narrowband RGB LED backlight. Camera and film are static across all three frames; only the LED changes, so they register to the pixel.
- DSC00448.ARW — Red LED (raw channel means ≈ 84% R)
- DSC00449.ARW — Green LED (≈ 74% G)
- DSC00450.ARW — Blue LED (≈ 68% B)
All ISO 100, 1/25s, custom WB. Per-channel brightness is tuned on the LEDs, so at a fixed shutter the three raw channel means land within ~1.6× of each other (≈ 2190 / 2930 / 3580 for R/G/B). The residual cross-channel signal (84/74/68 vs a perfect 100) is normal Bayer CFA spectral overlap.
Sample data for a NegPy contribution proposal.