In a layer-swap photo print, color choice is not decoration — it IS the image. The photo's brightness decides how tall each pixel grows, and the filament loaded at that height decides what color the pixel becomes. Pick a palette whose brightness order fights the photo and you get mud; pick one that follows it and the image snaps into focus.
Rule 1: order colors by luminance, not by hue
The single most important rule: your filament sequence must go from dark to light. Black (or the darkest color) at the bottom, white (or the lightest) on top, midtones in between ordered by how bright they look — not by how they are named. A vivid red is surprisingly dark (about 30% luminance); a lemon yellow is very light (about 90%). Swap those two and shadows print yellow while highlights print red — the image inverts locally and stops reading.
Rule 2: use real, buyable filament colors
A preview rendered with imaginary hex colors will not match the print made with the spools you actually own. Every palette in the TanskyLab generator uses official Bambu Lab filament colors with their spool codes — Jade White (10100), Desert Tan (11401), Marine Blue (11600) and so on — so the preview is honest and the shopping list writes itself. If you print other brands, pick the closest match and expect small shifts.
Rule 3: two midtones do most of the work
Black and white anchor the range, but the two middle colors define the character of the print: browns give a warm classic-photo look, grays a neutral documentary feel, a bold color adds a poster-like effect. Keep the two midtones clearly different in brightness from each other — if they are within about 15% luminance, they merge visually and you effectively printed three colors.
Or skip the theory: recommended palettes
The generator now analyses your photo and recommends a palette automatically: it clusters the photo's dominant tones, orders them by luminance and snaps each one to the nearest real filament color. It is applied by default when you reach the palette step — and the auto-match tool then tunes contrast and midtones so the simulated print sits as close to your original photo as possible.
Upload a photo at tanskylab.com and watch which four spools it suggests — then decide whether to follow it or use it as a starting point for your own palette. Two free generations per month, no payment required.