9aa305700c
Replace simple threshold-based grayscale quantization with ordered dithering using a 4x4 Bayer matrix. This eliminates color banding artifacts and produces smoother gradients on e-ink display. - Add 4x4 Bayer dithering matrix for 16-level threshold patterns - Modify grayscaleTo2Bit() to use pixel position for dithering - Simulates smooth grayscale transitions in BW mode without flicker
16 lines
473 B
C++
16 lines
473 B
C++
#pragma once
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#include <FS.h>
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class ZipFile;
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class JpegToBmpConverter {
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static void writeBmpHeader(Print& bmpOut, int width, int height);
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static uint8_t grayscaleTo2Bit(uint8_t grayscale, int x, int y);
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static unsigned char jpegReadCallback(unsigned char* pBuf, unsigned char buf_size,
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unsigned char* pBytes_actually_read, void* pCallback_data);
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public:
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static bool jpegFileToBmpStream(File& jpegFile, Print& bmpOut);
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};
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