134 lines
3.9 KiB
Python
134 lines
3.9 KiB
Python
from PIL import Image
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import math
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import argparse
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import os.path
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#for a 2-bit dithered grayscale image use:
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# convert testimage.png -dither FloydSteinberg -define dither:diffusion-amount=85% -remap 4gray.png -compress RLE -define png:color-type=6 output.png
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def swapBits(number, nbits):
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if nbits==2:
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bitstring = '{0:02b}'.format(number)
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if nbits==3:
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bitstring = '{0:03b}'.format(number)
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if nbits==4:
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bitstring = '{0:04b}'.format(number)
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if nbits==5:
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bitstring = '{0:05b}'.format(number)
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if nbits==6:
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bitstring = '{0:06b}'.format(number)
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if nbits==7:
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bitstring = '{0:07b}'.format(number)
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if nbits==8:
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bitstring = '{0:08b}'.format(number)
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bitstring=bitstring[::-1]
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return int(bitstring, 2)
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parser = argparse.ArgumentParser(
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prog = 'Image Edit Script',
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description = 'Manipulate or extract information from an image file',
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epilog = '')
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parser.add_argument('filename') # positional argument
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parser.add_argument('-n', '--bytesperline')
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parser.add_argument('-d', '--bitdepth')
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parser.add_argument('-b', '--lsbfirst', action='store_true') #lsb first for the whole byte
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parser.add_argument('-c', '--colorlsbfirst', action='store_true') #lsb first for a single color
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parser.add_argument('-i', '--invert', action='store_true')
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args = parser.parse_args()
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lsbfirst=args.lsbfirst
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colorlsbfirst=args.colorlsbfirst
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invert=args.invert
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bitdepth=1
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if args.bitdepth is not None:
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_bd=int(int(args.bitdepth))
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if _bd!=1 and _bd!=2 and _bd!=4 and _bd!=8:
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print("bitdepth needs to be 1, 2, 4, or 8")
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exit()
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bitdepth=_bd
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bytesperline=16
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if args.bytesperline is not None:
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bytesperline=int(args.bytesperline) #for output formatting
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im = Image.open(args.filename) # Can be many different formats.
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pix = im.load()
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print(im.size) # Get the width and hight of the image for iterating over
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array=[] #array with every element a byte
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def calculateDistance(x1,y1,x2,y2):
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dist = math.sqrt((x2 - x1)**2 + (y2 - y1)**2)
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return dist
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temp_byte=0
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temp_byte_pos=0
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for y in range(im.size[1]):
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for x in range(im.size[0]):
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c = pix[x,y] #get pixel
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r=c[0]
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g=c[1]
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b=c[2]
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_a=int((r+g+b)/3 )
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brightness=int(_a)
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brightnessreduced=brightness>>(8-bitdepth) #reduce to bitdepth
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brightnessreduced_byte=brightnessreduced<<(8-bitdepth) #scale back to byte
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pix[x,y]=(brightnessreduced_byte,brightnessreduced_byte,brightnessreduced_byte)
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if invert:
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brightnessreduced=pow(2,bitdepth)-1-brightnessreduced #only invert txt output
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if colorlsbfirst:
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brightnessreduced=swapBits(brightnessreduced,bitdepth)
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temp_byte+=brightnessreduced<<temp_byte_pos #add to current byte
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temp_byte_pos+=bitdepth
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#print("temp byte "+str(temp_byte)+" pos="+str(temp_byte_pos)+" brightnessreduced="+str(brightnessreduced))
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if temp_byte_pos>=8: #finished assemblying byte
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if lsbfirst: #swap bit order
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temp_byte=swapBits(temp_byte,8)
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array.append(temp_byte)
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#print("appending "+str(temp_byte))
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temp_byte_pos=0 #reset
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temp_byte=0
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im.save(args.filename+'_result'+'.png')
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if os.path.isfile(args.filename+'.txt'):
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print("Outputfile "+args.filename+".txt exists")
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exit()
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with open(args.filename+'.txt', 'w') as f:
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f.write("const unsigned char gImage_4in2[] = {")
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f.write('\r\n')
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counter=0
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for a in array: #for every byte
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hexstring="0X{:02X}".format(a)
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f.write(hexstring+',') #Example output: 0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
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counter+=1
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if counter>=bytesperline:
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f.write('\r\n')
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counter=0
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f.write("};")
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