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epaperdisplay
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imageconverter/4gray.png
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3
imageconverter/img2array.py
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@ -3,9 +3,6 @@ import math
import argparse
import os.path
#for a 2-bit dithered grayscale image use:
# convert testimage.png -dither FloydSteinberg -define dither:diffusion-amount=85% -remap 4gray.png -compress RLE -define png:color-type=6 output.png
def swapBits(number, nbits):
if nbits==2:

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src/ImageData.cpp
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src/main.cpp
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@ -1,22 +1,6 @@
// Library, connections and info from: https://www.waveshare.com/wiki/E-Paper_ESP32_Driver_Board#Resource
// Display: https://www.waveshare.com/product/4.2inch-e-paper.htm
//Convert to 1 bit grayscale:
//maybe dither before
// convert image to array:
// python3 img2array.py -i image.png
//Convert to 2 bit grayscale dithered:
// first convert image to dithered 2 bit image:
// convert testimage.png -dither FloydSteinberg -define dither:diffusion-amount=85% -remap 4gray.png -compress RLE -define png:color-type=6 output.png
// then image to array:
// python3 img2array.py --bitdepth 2 --lsbfirst --colorlsbfirst testimage.png
// then copy generated ...png.txt content to ImageData.cpp
/* Includes ------------------------------------------------------------------*/
#include "DEV_Config.h"
#include "EPD.h"
@ -54,7 +38,7 @@ void setup()
printf("show image for array\r\n");
Paint_SelectImage(BWImage);
Paint_Clear(WHITE);
Paint_DrawBitMap(gImage_4in2);
Paint_DrawBitMap(gImage_4in2); //to convert image use: python3 img2array.py -i image.png
EPD_4IN2_Display(BWImage);
free(BWImage);
@ -80,7 +64,7 @@ void setup()
Paint_SelectImage(GSImage);
Paint_SetScale(4);
Paint_DrawBitMap(gImage_4in2);
Paint_DrawBitMap(gImage_4in2);
EPD_4IN2_4GrayDisplay(GSImage);
DEV_Delay_ms(10000);