From 14a61e97b8887ac818a9311965094b505a9f4644 Mon Sep 17 00:00:00 2001
From: Fisch <interfisch@gmx.net>
Date: Fri, 11 Nov 2022 21:10:28 +0100
Subject: [PATCH] move comments to top of file

---
 src/main.cpp | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 1079543..0e9d6e7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,22 @@
 // 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"
@@ -38,7 +54,7 @@ void setup()
     printf("show image for array\r\n");
     Paint_SelectImage(BWImage);
     Paint_Clear(WHITE);
-    Paint_DrawBitMap(gImage_4in2);  //to convert image use: python3 img2array.py -i image.png
+    Paint_DrawBitMap(gImage_4in2);
     EPD_4IN2_Display(BWImage);
     
     free(BWImage);
@@ -64,7 +80,7 @@ void setup()
     Paint_SelectImage(GSImage);
     Paint_SetScale(4);
 
-    Paint_DrawBitMap(gImage_4in2);   //to convert 2-bit gray image to array: convert testimage.png -dither FloydSteinberg -define dither:diffusion-amount=85% -remap 4gray.png -compress RLE BMP3:output.bmp 
+    Paint_DrawBitMap(gImage_4in2);  
     EPD_4IN2_4GrayDisplay(GSImage);
 
     DEV_Delay_ms(10000);