# davemorrissey/subsampling-scale-image-view

Android library (AAR). Highly configurable, easily extendable deep zoom view for displaying huge images without loss of detail. Perfect for photo galleries, maps, building plans etc.

Repository: https://github.com/davemorrissey/subsampling-scale-image-view
Canonical: https://ross.abutalabs.com/products/subsampling-scale-image-view
Language: Java
License: Apache-2.0
License Family: permissive
Topics: android-library, android-lib, android-libs, zoom-images, deep-zoom-images, pan, scale, zoom-gestures, large-images, android
Last push: 2024-04-22T02:45:16+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4755, "days_push": 863, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8006, forks 1237 (observed 2026-08-28T04:10:11.587454+00:00)

## What it is
An Android library providing a highly configurable, extendable image view for displaying very large images with deep zoom support. It uses subsampling and tiling to load only visible high-resolution regions, avoiding OutOfMemoryError while supporting pinch-to-zoom, panning, rotation, and animations.

## Use cases
- display huge images in an Android photo gallery without running out of memory
- show zoomable maps or building plans in an Android app
- add pinch-to-zoom and panning to large images
- load high-resolution tiles of a large image as the user zooms in
- display a preview image while a large image loads
- overlay custom markers or annotations on a zoomable image

## When to choose
- your Android app must display very large images (maps, plans, high-res photos) with smooth zooming
- you need to avoid OutOfMemoryError when showing high-resolution images
- you want configurable zoom gestures, rotation, and animation out of the box
- you need to extend an image view with overlays and custom touch handling

## When to avoid
- you only need to display small images that fit comfortably in memory
- you are building for platforms other than Android
- you need a full photo gallery UI rather than just an image view component
- your project requires Kotlin-first or Jetpack Compose-native solutions without interop

## Facets
- artifact type: library
- maturity: stable
- function: image-processing, ui-components
- domain: mobile-development, graphics, android-tools
- platform: jvm
- tags: android-library, deep-zoom, pinch-to-zoom, large-images, image-view, tiling, pan-and-zoom, android, mobile

## Member repositories
- davemorrissey/subsampling-scale-image-view (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:11.587454+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:32:13.769938+00:00, confidence not recorded.
  - readme: https://github.com/davemorrissey/subsampling-scale-image-view (fetched 2026-08-28T04:10:11.587454+00:00, sha a3ae5d45c026)
- Data as of 2026-08-30T08:39:29.467469+00:00.