Lumis

A fully manual camera app for pixel peepers who demand complete control over every photon hitting the sensor. No compromises. Just pure stochastic linear goodness.

All images here were created with Lumis and full resolution RAW .dng's are available for download.
Click any image below to download the original image and examine yourself!

Features

Computational Modes

Long Exposure

Frame averaging for noise reduction and making water look delightful

Difference Sum

Captures frame-to-frame differences highlighting scene changes

Motion Extraction

Isolates only moving elements, invariant of brightness

Slitscan

Photo-finish time-strip: one integrated slit per moment, stacked into a scrolling record where the vertical axis is time

More Samples!

Beautiful Histograms!

Dual-logarithmic histogram with adaptive horizontal oversampling and anti-aliasing. Both axes aligned and scaled in powers of 2 for measurement in stops. Per-channel clipping warnings in left (underexposed) and right (overexposed), ADC gap correlation and scaling.

DSR™ Spectral Colour Calibration

VERICHROME spectral calibration target. Automated FFT-based alignment, polynomial vignette correction, IR contamination, fluorescence based ambient UV measurement and lifetime remaining indicator. Direct Scene-Referred™ profiling completely bypasses Android's camera characterization for total spectral accuracy in literally any lighting condition.

Technical Architecture

• As much Rust as possible, only Kotlin where required
• Rendering: Custom spectral imaging pipeline
• Per-sensor dark-frame calibration (bias + dark-current subtraction, ISO/exposure scaled) with hot-pixel reconstruction, applied to every output format
• Integer accumulation buffers for zero loss
• Stochastic dithering on output to preserve gradients
• Ratio Corrected Demosaicing for RGB exports, plus a purpose-built quad-Bayer demosaic for maximum-resolution (Tetracell) sensors
• 16-bit raw DNG, 16-bit TIFF, JPEG, and lossless JPEG XL output; self-verifying VSF calibration files
• Dual-process, zero-copy architecture: a dedicated camera process shares one memory buffer with the interface, no per-frame copying
• Quad-Bayer (Tetracell) maximum-resolution capture, tagged with its true 4x4 colour-filter pattern
• Photo-finish slitscan capture with run/pause and a wrap-around 1:1 pixel inspector
• Linear sensor output - no tone curves applied EVER
• No 'pretty' colour science
• No sharpening or edge enhancement
• No artificial contrast curves
• No saturation boosts
• No computational HDR or exposure fusion
• No AI "enhancement" or machine learning
• No lens distortion correction
• No automatic vignette compensation
• No hidden hot-pixel removal - reconstruction happens only from your own dark-frame calibration, when you choose to load it
• No chromatic aberration adjustment
• No proprietary look tables or film simulations
• No mystery processing pipelines
• No perceptual rendering - just physics and math

Requirements

• Android device with Camera2 API support
• Camera with RAW capture capability
• Android 5.0 (API 21) or higher
• Excitement to shoot FULL MANUAL

Why Manual Only?

Because automation is a lie told by cameras that don't trust you to know what you're doing.

Auto-focus picks the wrong subject. Auto-exposure blows highlights or crushes shadows.
Auto white balance makes everything look like a fluorescent office. These aren't conveniences - they're constraints designed for people who don't care about the final image.

Lumis doesn't make decisions for you. It doesn't "enhance" your photos into algorithmic mush.
It doesn't apply mystery processing pipelines that turn sensor data into computational guesswork. It captures photons, counts them, and gets out of your way.

If you want a camera that thinks it's smarter than you, use literally any other app. If you want uncompromising control over every aspect of image capture, you're in the right place.

Changelog

2026-07-11 · v2.1

Manual focus now works on far more devices. Many camera pipelines quietly refuse to drive the lens on a RAW-only capture session - the slider did nothing and focus sat parked past infinity. Lumis now configures the full pipeline, so the lens follows the slider live. Slitscan got a matching overhaul: the preview renders thru the same pipeline as every other mode, pinch-zoom stays anchored on the region you grabbed instead of scrolling away, and highlight/shadow clipping indicators work. Plus on-screen save buttons - single save and a continuous mode that saves every completed integration - and a subtle magenta guide line in the normal view marking exactly where the slitscan band samples, so you can line up the shot before switching modes.

2026-07-01

Fixed image rotation in embedded thumbnails and previews - file-manager icons and galleries now show the right way up. Full-resolution image data still stays in native sensor orientation with the rotation recorded in the orientation tag (nothing baked in or thrown away); only the small preview is turned upright for you. Applies across DNG, TIFF, JPEG, and JPEG XL.