Eunchurn Park 16568932cf Improve EPUB cover image quality with pre-scaling and Atkinson dithering ... Pre-scaling (critical fix): - Add pre-scaling to fit display dimensions (480x800) before dithering to prevent post-downsampling artifacts that destroy dithering patterns - Use fixed-point (16.16) math for sub-pixel accurate scaling - Implement area averaging for smooth downsampling Dithering improvements: - Add Atkinson dithering (75% error diffusion) for cleaner results - Add Floyd-Steinberg dithering option with serpentine scanning - Keep clustered-dot halftone and Bayer as compile-time options Image adjustments: - Add brightness, contrast, and gamma adjustments for better visibility - Adjust RGB to grayscale conversion (25-50-25) to reduce blue darkness Other changes: - Fix MCU block indexing bug for correct picojpeg buffer access - Pre-generate cover BMP when EPUB is loaded for faster sleep screen		2025-12-25 00:33:15 +09:00
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JpegToBmpConverter.cpp	Improve EPUB cover image quality with pre-scaling and Atkinson dithering	2025-12-25 00:33:15 +09:00
JpegToBmpConverter.h	Improve EPUB cover image quality with pre-scaling and Atkinson dithering	2025-12-25 00:33:15 +09:00