dsqueez

Pixel-accurate anamorphic desqueeze for Android. Three taps from a squeezed JPEG to a finished file in your album.

Shoot anamorphic on the Lumix S9? Video previews come out desqueezed on-camera, but stills land on your phone horizontally compressed — and Lumix Lab doesn't fix it on transfer. dsqueez closes that gap: open Lumix Lab, hit Share → dsqueez → Save. The corrected file lands in a dedicated dsqueez album in Google Photos, with original EXIF, color profile, and capture date intact, ready for Lightroom or Instagram.

1. Open the Releases page and download dsqueez-vX.Y.Z.apk.
2. On your phone, tap the APK from your file manager. Approve "Install unknown apps" once when prompted.
3. dsqueez appears in your launcher and as a target in any image share sheet.

Bleeding-edge builds: every push to master produces an APK as a workflow artifact under Actions. Note: CI builds use a per-run debug keystore, so uninstall the previous version before installing a new one.

• Picks the right ratio automatically. Reads LensModel from EXIF and snaps to the matching squeeze factor — SIRUI, Vazen, Cooke and most anamorphic glass announce themselves there. A DETECTED · {LENS} line surfaces above the picker so you can see what it's basing the suggestion on.
• All six native Lumix S9 ratios. 1.30×, 1.33×, 1.50×, 1.60×, 1.80×, 2.00× — same set you pick from in-camera for video. Long-press any chip to set it as your default for photos without an EXIF lens hint.
• No quality compromise. Hand-written Lanczos-3 kernel against libjpeg-turbo — same kernel as ImageMagick and FFmpeg. Output is bit-identical to libvips for this operation.
• Every byte of metadata survives. EXIF (camera, lens, ISO, shutter, GPS, datetime) and ICC color profile carried through untouched. Orientation gets baked into pixels so no downstream reader rotates the file twice.
• Share-sheet first. Three taps from Lumix Lab to a finished file in your camera roll. No file-picker dance.
• Batch processing. Share a stack of photos, process in parallel.
• No ads, no accounts, no telemetry. Local processing only — your photos never leave the device.
• Photographer's interface. Halide-inspired dark and light themes, monospace numerals, motion and haptics tuned for the Pixel.

Anamorphic lenses optically squeeze a wide field of view onto a regular 3:2 sensor. To get a normal image back, you stretch it horizontally by the lens's squeeze factor — usually 1.33×, 1.5×, or 2×. The Lumix S9 desqueezes its video preview in real time, but exports stills as-shot.

dsqueez runs the stretch in native C++ using a Lanczos-3 kernel against libjpeg-turbo, then writes a new JPEG with EXIF (APP1) and ICC (APP2) carried through. The right squeeze factor is read from the photo's LensModel EXIF tag when present and falls back to your long-press-set default otherwise. Output lands in DCIM/dsqueez/, which Google Photos shows in your main feed (DCIM is the standard camera-roll location, alongside DCIM/Camera).

By design, to keep dsqueez a single-purpose tool:

• No crop, rotate, color, exposure, or any other editing
• No RAW / DNG support — Lightroom on desktop is the right tool for that
• No HEIC — Lumix Lab exports JPEG, so dsqueez accepts JPEG
• No cloud sync, accounts, telemetry, analytics, ads

MIT. Bundled fonts and the linked libjpeg-turbo retain their own licenses — see Credits.

• libjpeg-turbo — modified BSD, statically linked
• Inter and JetBrains Mono — SIL Open Font License 1.1
• AndroidX, Jetpack Compose, Material 3 — Apache 2.0

Visual language inspired by Halide and Kino from Lux Optics.

./gradlew installDebug    # build + install on a connected Pixel
./gradlew assembleDebug   # just build, leaves the APK at app/build/outputs/apk/debug/

adb logcat -s dsqueez-native dsqueez-jni Resampler

xcrun clang++ -std=c++17 -O2 \
  -I/opt/homebrew/include -Iapp/src/main/cpp \
  test/dsq_test.cpp \
  app/src/main/cpp/lanczos.cpp \
  app/src/main/cpp/jpeg_pipeline.cpp \
  app/src/main/cpp/dsqueez.cpp \
  -L/opt/homebrew/lib -ljpeg \
  -o /tmp/dsq_test

/tmp/dsq_test input.jpg output.jpg 1.33 1
# Args: input output ratio orientation(1..8)

app/src/main/
├── kotlin/app/dsqueez/
│   ├── DsqueezApp.kt              Application — loads libdsqueez.so
│   ├── MainActivity.kt            Single activity; routes SEND / SEND_MULTIPLE / VIEW intents
│   ├── ui/
│   │   ├── theme/                 Color, Type, Motion, Spacing, Haptics
│   │   ├── components/            PhotoFrame, MetadataStrip, RatioControl, …
│   │   ├── screens/               Empty / Edit / Batch
│   │   └── anim/DesqueezeStretch  The signature stretch animation
│   ├── photo/                     Pipeline, MediaStoreSaver, PhotoSource
│   ├── nativebridge/Resampler.kt  JNI surface
│   ├── settings/UserPrefs.kt      DataStore
│   └── share/ShareIntent.kt       SEND / SEND_MULTIPLE / VIEW parser
└── cpp/
    ├── CMakeLists.txt             FetchContent libjpeg-turbo, single .so output
    ├── dsqueez.{h,cpp}            Orchestrator: decode → orient → resample → encode
    ├── lanczos.{h,cpp}            Lanczos-3 kernel + horizontal resample
    ├── jpeg_pipeline.{h,cpp}      libjpeg-turbo decode/encode + EXIF/ICC passthrough
    └── jni_bridge.cpp             JNI surface, Android-only

git tag -a v0.2.0 -m "Release notes"
git push origin v0.2.0