Build a calibration

Upload the calibration charts you printed on the Lab and scanned back in. This fits the film's response and gives you a .json the corrector can load. Color and B&W are independent — do whichever you want.

← Back to the corrector

How this works

  1. Download the charts below (or individually in the corrector's Advanced panel) and print each one on the Lab with correction OFF.
  2. Scan or photograph the prints. Best results: scan all prints in a single pass, with the scanner's auto-color / auto-exposure turned off, and the whole chart (including its black corner squares) in frame.
  3. Upload the scans below and hit Build. Check the overlay to confirm the patches were located, then download the .json.
  4. Back in the corrector, open Advanced → Load calibration and pick your file.

All 8 charts in one file: 2 color + 1 B&W calibration charts, plus 5 refinement test charts (color cube ×2, extreme tone, repeatability, vignette).

Or get charts individually (on a phone, saves to Photos)

Color calibration optional

Upload Color chart 1 and/or Color chart 2. One works; both (98 patches) fits the tone curve and color cast more accurately.

B&W calibration optional

Upload the B&W chart scan. This fits the tone curve plus the film's spectral weights (how bright red / green / blue render in B&W — this stock is blue-sensitive).

Color — high accuracy 3D · cube charts

Upload both color cube charts (216 patches total). This fits a full 3D LUT that models cross-channel behavior, so saturated colors land much more accurately than the per-channel color fit. Print both with correction OFF.