# Write with same filename, max compression new_sb3.writestr(item.filename, data, compress_type=zipfile.ZIP_DEFLATED)
: Use lossless compression tools (like OptiPNG) to reduce file sizes while maintaining pixel-perfect clarity.
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"Extra Quality" in this context typically refers to ensuring your assets (images and audio) remain uncompressed and correctly linked during the re-zipping process to prevent data loss or project corruption. 1. Prepare Your Assets : Ensure your root folder contains the project.json
Converting Scratch projects between different formats is a common task for educators, students, and developers working within the MIT Scratch ecosystem. A frequent technical requirement is converting standard .zip archives into optimized .sb3 files, often referred to in developer communities as achieving "extra quality" conversions. # Write with same filename, max compression new_sb3
If your project opens but displays blank white squares or silent blocks, the filenames inside the archive do not match the string names specified inside the JSON code. Double-check your asset array strings. Corrupted File Format
The images in your project should be balanced between high visual quality and efficient storage. If you share with third parties, their policies apply
Before archiving, ensure your folder structure mimics what Scratch expects.
This comprehensive guide covers everything you need to know to achieve an extra-quality conversion, preserve file metadata, and troubleshoot common conversion errors. Understanding the Formats: ZIP vs. SB3
: Scratch supports both formats. For high-fidelity audio, use 44.1 kHz sampling rates. Ensure the file extension matches the internal encoding exactly. Step 2: Verify the project.json
