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README.md

ImageIO WebP plugin

Requirements

libwebp and libwebpdemux version 1.2.4+ must be installed on the target system.

Known installations methods

  • Homebrew (Mac & Linux): brew install webp
  • apt (Linux): apt-get install libwebp-dev

Features

  • Decode WebP images (lossless, lossy, and alpha)
  • Decode WebP animations. The reader returns the number of images in the animation, and can read individual frames.
  • For WebP Containers containing ICC Profile, that profile will be applied on the decoded image.

Limitations

  • Source subsampling doesn't exactly work, it uses the native scaling of libwebp, which doesn't have extensive control for subsampling X and Y. The following will not produce expected results:
ImageReadParam param=reader.getDefaultReadParam();
        param.setSourceSubsampling(2,2,0,0);

  • The Demux API is partially implemented:

    • Supported: ICC profile, animation
    • Unsupported: EXIF and XMP

  • Source region will snap to even values. This is a limitation from libwebp. The following will not produce expected results:

ImageReadParam param=reader.getDefaultReadParam();
    param.setSourceRegion(new Rectangle(3,3,9,9));

Implementation notes

The panama package bindings were generated using: