Calibration · UV Exposure
Master UV exposure for your prints.
UV-sensitive processes (cyanotype, Aquaprint, Van Dyke, Carbon) depend on light source, distance and exposure time. Calibration Flow quantifies these variables.
Why UV calibration is critical.
A 30-second exposure variation or a 5 cm distance change radically alters the result. Highlight density and tonal separation depend directly on the UV source.
Calibration Flow measures the actual density of each patch and compensates for deviations, regardless of your source: sunlight, UV tubes, UV LEDs or Luminograph.
UV processes
Processes compatible with UV calibration.
Cyanotype
Sensitive to UV-A (365 nm). The most popular alternative process — process-specific curve available in the app.
Aquaprint
Gum printing reformulated by Vision Picturale. UV exposure controls layer hardness and final rendering.
Van Dyke
Iron-silver process, highly UV-sensitive. Calibration compensates for the characteristic non-linearity in mid-tones.
Carbon
Carbon transfer with pigmented gelatin. UV exposure determines the thickness of the hardened layer — calibration is essential.
Recommended UV source
Luminograph — calibrated UV exposer.
The Vision Picturale Luminograph is a UV LED exposure unit designed for alternative processes. Uniform, reproducible, Calibration Flow compatible.
Discover the Luminograph →Frequently asked questions
UV Calibration — FAQ.
- Yes, but natural variability (time of day, season, cloud cover) makes reproducibility difficult. A controlled UV source is recommended for consistent results.
- UV-A tubes (365 nm) offer wide coverage but degrade over time. UV LEDs are more stable and allow precise intensity control.
- No. Only UV-sensitive processes are concerned. Platinum-palladium and resinotype also use UV but with different response curves — Calibration Flow handles each process individually.
- Yes, each UV source has a different spectrum and intensity. Changing sources requires a new calibration — the operation takes less than 15 minutes.
Calibrate your UV exposure.
Quantify your process’s UV response and get a correction curve in minutes.
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