# Calibration Flow — Negatives, curves, halftones > Negatives, curves, halftones (iPhone/iPad app by tristan sidem.) - Source: https://appshunter.io/ios/app/calibration-flow/id6747118030 (this page in markdown: same URL + `.md`) - Developer: [tristan sidem](https://appshunter.io/developer/1819920733) - Category: Graphics & Design, Photo & Video - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.0 · 15 MB - Languages: American English, French (France) - Released: 2026-09-16 - Data updated: 2026-10-09 - User reviews in markdown: https://appshunter.io/ios/app/calibration-flow/id6747118030/reviews.md ## What is Calibration Flow? Calibration Flow is the tonal calibration tool for silver-based and alternative photographic processes: cyanotype, platinum-palladium, gum bichromate (Aquaprint), carbon, Van Dyke, resinotype. KEY FEATURES • Custom calibration curves per process, paper and negative • Pre-calibration sheet: compare 12 settings per exposure time and refine your choice with 9 variants; crop library photos while preserving the original. • Digital negative: high-resolution generation and export (300 to 720 dpi, continuous tones or halftones) • Direct printing: send the negative to your printer from the app, with no AirPrint and no third-party app — it asks the machine what it can do before sending, honors its hardware margins, and follows the job • CMYK tonal separation with black generation control (GCR), including multi-zone • Full Gamut color mode with 5, 6 and 7 channels (Orange, Green, Violet), to go beyond simple CMYK • Ink steps: set where each ink stops, in negative as well as positive, combinable with zones • Screen angles: one angle per ink (rosette) or all aligned • Color Venn: printing test target and ink-layer overlay simulator, with eyedropper and magnifier • .acv export for Photoshop, Lightroom, Affinity Photo and GIMP • Registration marks: a frame of targets around the image and a mini-target that follows the output, in negative as well as positive • Harmonic exposure timer with circular dial, multi-device sync, and Dynamic Island / Live Activity on iPhone • Bluetooth control for compatible UV lamps (BanlanX SP630E controller) — on/off control from the app, no variable-intensity dimming • HD media library with cloud sync and multi-device access • Large-format tiling: edge-to-edge A4, A3 and A3+ sheet assembly PRO SUBSCRIPTION Calibration Flow is free with: – 3 cloud-synced calibration curves – 300 MB of cloud storage – Unlimited presets – CMYK tonal separation (4 inks) The Pro subscription unlocks: – Unlimited calibration curves – 5 GB of cloud storage – .acv export (Photoshop) – Color mode with extended inks (5 to 7) – Advanced separation settings: black generation, fine tuning Two plans: €9.90/month, or €99/year (equivalent to €8.25/month, effectively 2 months free). Auto-renewing, cancel anytime in your Apple account Settings. Your subscription works across all your Picturale devices. Calibration Flow is part of the Picturale ecosystem, dedicated to silver-based photographic processes and non-toxic photography. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Calibration Flow Terms: https://calibrationflow.com/cgu ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Picturale Pass Monthly | $8.90 | per month | | Picturale Pass Yearly | $89.00 | per year | ## Version history (last 5 releases) ### 4.5.1 — 2026-10-09 • New pre-calibration sheet: compare 12 settings per exposure time, then refine your choice with 9 variants in increments of 5. Each photo keeps its matching 5×5 target and setting code. • Free, A4 or A3+ cropping from the library while preserving the original. • More reliable HD generation, improved progress reporting and corrected horizontal mirroring. • Automatic brightness and level adjustments in photo analysis. • A 5×5 reference is shown after importing a scan. • More robust print transfers and improved Epson M1170 support. ### 4.5 — 2026-10-02 PRINTING — TRUE 720 DPI FROM THE IPHONE • The negative is sent in the Epson printer's native language, directly, without AirPrint: exact 720 dpi, A4 and A3+, the sheet comes out whole and at its size. • Four times faster sending: an A3+ at 720 dpi leaves in 9 minutes instead of 37. • Sending terminal: follow the transfer, cancel it with one tap, and read what actually left (format, compression, head direction). • Settings cut down to the essentials: stream format, compression, head both ways or one way, rear manual slot, rear feeder or tray 1. • Every feed says what it takes: a feed too small for the requested sheet is greyed out and nothing is sent by mistake. HOME • History of your last 20 exposures, on the home screen. NEGATIVE • A3+ at 720 dpi on iPhone: the sheet is built in bands, without saturating memory. • 360 and 720 dpi steps; the app warns when the printer will have to resample. • Grain as an option, next to the screen. The screen dot is always round. • Decontrast, up to 50%, in place of the old gum screen mode. • Marks: three exposure charts to the right of the image. • The saved PNG carries its resolution: no more 72 dpi reading on a computer. • Full-screen viewer: zoom to the real pixel, thumbnails, arrows. SCAN → CURVE • Smart correction: stained patches are put back in place, blacks and whites aligned, a column that reads off to the side is realigned. • The curve starts from the chart's useful zone, with no forced 0 or 255. • Drag a curve point by hand; the scan gestures always stay active. TIMER • Minimum exposure 1 s, 0.1 s steps up to 2 s, 0.2 s up to 3 s, 0.5 s up to 4 s. ALSO • A preset downloaded from the cloud is no longer uploaded back as a duplicate. • Overlay: a large temporary loupe circle on iPhone. • No more blue highlight when dragging a finger across the interface. ### 4.4 — 2026-09-26 TIMER • Set exposures to the tenth of a second up to 5 s, to the second up to 30 s, then in 5 s steps up to 1 min 30. Tenth-of-a-second countdown for short exposures. COMMUNITY • Block an author: all their posts disappear from your catalog and a report goes to moderation. Show them again in one tap. NEGATIVE • A3+ at 450 dpi is now available on iPhone: generation works in bands and uses far less memory. • A sheet the device refuses is no longer reported as a success. • Color mode: the "Simulated print" thumbnail opens the full HD black-and-white negative. • Share…: send an exported negative straight through AirDrop, Mail or Messages. LIGHTER • A lighter app; the loupe and the UV plug no longer tax the device when they are not in use. • Haptic feedback when printing and on the UV plug. • VoiceOver: close buttons and the timer dial are properly named, in your language. ### 4.3.1 — 2026-09-17 • "The hue sphere" demo in the color separation Simulator • Color mode: plates now display as a grid, with full-screen preview and HD download • Direct printing: fix for Epson ET-8550 printers • Subscribers: cloud sync and Pro status display fixed • Magic-link sign-in fixed in the app ### 4.3 — 2026-09-16 No release notes. ## Apps similar to Calibration Flow | App | Rating | Price | Category | | --- | --- | --- | --- | | [Print Lab: Riso Photo FX](https://appshunter.io/ios/app/print-lab-riso-photo-fx/id6795146704) | — | Free | Graphics & Design | | [Demosaic](https://appshunter.io/ios/app/demosaic/id6760301799) | — | Free | Graphics & Design | | [DigiCamFx: Face Makeup Filters](https://appshunter.io/ios/app/digicamfx-face-makeup-filters/id6753110571) | 4.2 (5) | Free | Graphics & Design | | [Real Halftone 2](https://appshunter.io/ios/app/real-halftone-2/id1632423711) | 4.9 (15) | Free | Graphics & Design | | [App Presets for Lightroom](https://appshunter.io/ios/app/app-presets-for-lightroom/id1541309118) | 4.7 (56) | Free | Graphics & Design | | [Deco AI Photo Interior Design](https://appshunter.io/ios/app/deco-ai-photo-interior-design/id6449844504) | 2.4 (24) | Free | Graphics & Design | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-09.*