March 12, 2010

Generating NTSC with Arduino

Convert an indexed grayscale image (16-color) to a list of hex values for use in arduino program.

png2avr.py

# copy-it-right import sys from PIL import Image

def main(): image =Image.open("robert_index.png") out_f = open("robert_index.txt", "w")

#image = Image.open(sys.argv[1])

assert image.mode == 'P', 'image must be indexed'

#sys.stdout.write(chr(int('11111100', 2)))

for i, px in enumerate(image.getdata()): if(i%160==0): out_f.write('\n// '+str(i/160)) print('\n// '+str(i/160)) #sys.stdout.write('\n')

out_f.write(hex(px)+', '), print(hex(16-px)+', '), #sys.stdout.write(hex(px)) #print('.')

out_f.close()

if name == 'main': main()

Indexed 16 Color Grayscale Image (160x120x4bits)

Displayed through the Arduino to NTSC video

Thanks to MeowJapan.