react / react/react-native

[Android] RNImage resize causes very long images to become blurry

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Component: Image Issue: Author Provided Repro Platform: Android
Dominant language
C++
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Forks
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Avg merge
1d 23h
Merged PRs (30d)
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Description

Description
  • RNImage causes very long images to become blurry when resized
  • I know it uses Fresco under the hood and Fresco has a limitation of up to 2K resolution, but at least it accepts a configurable max size
  • Also recent Android devices can draw much larger than 2K
  • I think React Native Image should accept a max size option too
  • Or we can update Fresco max size limit
Steps to reproduce
  • Load a very large image with RNImage
React Native Version

0.82.1

Affected Platforms

Runtime - Android

Output of npx @react-native-community/cli info
System:
  OS: macOS 26.1
  CPU: (8) arm64 Apple M1 Pro
  Memory: 212.97 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.18.0
    path: /Users/hoseongson/.local/share/mise/installs/node/22.18.0/bin/node
  Yarn:
    version: 1.22.19
    path: /usr/local/bin/yarn
  npm:
    version: 10.9.3
    path: /Users/hoseongson/.local/share/mise/installs/node/22.18.0/bin/npm
  Watchman:
    version: 2025.11.10.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/hoseongson/.local/share/mise/installs/ruby/3.3.0/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.1
      - iOS 26.1
      - macOS 26.1
      - tvOS 26.1
      - visionOS 26.1
      - watchOS 26.1
  Android SDK: Not Found
IDEs:
  Android Studio: 2025.2 AI-252.25557.131.2521.14432022
  Xcode:
    version: 26.1.1/17B100
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.17
    path: /Users/hoseongson/.local/share/mise/installs/java/corretto-17.0.17.10.1/bin/javac
  Ruby:
    version: 3.3.0
    path: /Users/hoseongson/.local/share/mise/installs/ruby/3.3.0/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.1.1
    wanted: 19.1.1
  react-native:
    installed: 0.82.1
    wanted: 0.82.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false
Stacktrace or Logs
N/A
MANDATORY Reproducer

https://github.com/sookcha/RnTallImage

Screenshots and Videos
Image

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the RNImage Android implementation and the Fresco ResizeOptions limitation described in the issue. Run the mandatory reproducer at https://github.com/sookcha/RnTallImage with React Native 0.82.1 and compare resizing of very long images. Done should mean the image no longer becomes unexpectedly blurry, with the intended maximum-size behavior defined and covered by an appropriate test.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, react-native
Domain
mobile, performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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