Question 1

How do I add WebP support to my Java app?

Accepted Answer

Include the imageio-webp JAR as a dependency via Maven or manually add it to your classpath. It integrates with ImageIO.read() for reading WebP files, though writing is not supported.

Question 2

TwelveMonkeys vs JAI for image processing?

Accepted Answer

TwelveMonkeys is actively maintained with pure-Java implementations and broader modern format support, while JAI is stagnant and relies on native libs. However, JAI might offer better performance for some formats due to native code.

Question 3

How to handle plugins in a servlet environment without leaks?

Accepted Answer

Use the IIOProviderContextListener in your web.xml to dynamically load and unload plugins. This prevents memory leaks when servlet contexts reload, as detailed in the README.

Question 4

Can I write PSD files with this library?

Accepted Answer

Partial write support is indicated with (✔) in the format table, but it may be limited. Check the plugin documentation for specific capabilities and consider it for basic PSD output.

Question 5

How to merge all plugins into a fat JAR?

Accepted Answer

Use build tools like Maven Shade with the ServicesResourceTransformer to merge service provider files. This ensures all SPI entries are combined, preventing plugin discovery issues in bundled JARs.

Question 6

What's the performance of pure-Java readers compared to native?

Accepted Answer

While optimized, pure-Java readers may be slower for some operations, but they offer portability and avoid platform-specific dependencies. Performance trade-offs are noted in the README for memory-intensive tasks.

TwelveMonkeys

What is TwelveMonkeys?

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Frequently Asked Questions