Program that takes an image (640x384) and converts it to ascii strings

127 Expert 100+

Do you remeber the "old" internet? before webbrowsers, when everything had a strong unix flavour? Back then there was something called "ascii art" that is, use the ascii letters to create an image. Here is a program that takes an image (640x384) and converts it to ascii strings. I wanted to create this image for a t-shirt

You would need to copy the "courier new" font from your font directory to the same directory as the script, and also add an image that should be converted:

Expand|Select|Wrap|Line Numbers

 
import Image, ImageDraw

import ImageFont

import math
 
# funny useless program
 
lu = []

for i in range(125-32):

 lu.append(chr(i+33))

i2 = Image.new("RGBA",(64,64))

ii = Image.open("mona.png") # change this to your own picture, but it needs to be 640x384!

im = Image.new("RGBA",(64,64))

d = ImageDraw.Draw(im)

f = ImageFont.truetype("courbi.ttf",13)
 
str=""

for v in range(24):

 print v

 for k in range(80):

  chr = ""

  maxdiff = 0xffffff

  for e in lu:

   d.rectangle([0,0,64,64], fill=0)

   d.text((0,0),e,font=f,fill=0xffffff)

   diff = 0

   r0 = 0

   g0 = 0

   b0 = 0

   for a in range(16):

    for b in range(8):

     c =  im.getpixel((b,a))[0]

     c0 = (ii.getpixel((b+(k*8),a+(v*16)))[0] + ii.getpixel((b+(k*8),a+(v*16)))[1] + ii.getpixel((b+(k*8),a+(v*16)))[2])/3.0

     r0+= ii.getpixel((b+(k*8),a+(v*16)))[0]

     g0+= ii.getpixel((b+(k*8),a+(v*16)))[1]

     b0+= ii.getpixel((b+(k*8),a+(v*16)))[2]
 
     diff+=abs(c-c0)

   if(diff < maxdiff):

    maxdiff = diff

    chr = e
 
  r0*=1.0

  g0*=1.0

  b0*=1.0

  r0/=(16.0*8.0)

  g0/=(16.0*8.0)

  b0/=(16.0*8.0)

  ir0 = int(r0)

  ig0 = int(g0)

  ib0 = int(b0)
 
  r1 =  hex(ir0)

  r1 = r1[2:len(r1)]

  g1 = hex(ig0)

  g1 = g1[2:len(g1)]

  b1 = hex(ib0)

  b1 = b1[2:len(g1)]
 
  if(chr == " "):

   chr="&nbsp;"
 
  str+="<td width=\"8px\"><font size=\"1px\" color=\"#"+r1+g1+b1+"\">"+chr+"</font></td>"

 str="<tr>"+str+"</tr>"
 
str= "<html><body bgcolor=\"#000000\"><table width=\"640px\" height=\"386px\">"+str+"</table></body></html>"

f = open("mona.txt","w")

f.write(str)

f.close()

This program output it as a .html file, but it should easy to modify so it will output txt instead.

-kudos

Sep 14 '09 #1

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6880

colorado chris

I have modified your code to do a few things different.
It speeds it up enormously. I took 6min down to 1sec. I also made it run based on commandline parser so you can now put this on your website or wherever you want. There are a few issues in it if I recall (its been about 6 months since I wrote this). Feel free to tune it up and bring it back for everyone to have. It also uses true luminance vals in algorithm (if wanted).

--------------------------------------

Expand|Select|Wrap|Line Numbers

 '''

    Inspired by -Kudos code from http://bytes.com/topic/python/insights/874180-ascii-art-creator

    Pretty much a rewrite, but I give kudos complete props for posting this and making it fun and easy

'''
 
import sys,os

import Image, ImageDraw

import ImageFont

import math

import time, random

from optparse import OptionParser
 
# funny useless program

t0                             = time.time();

VERBOSE_LEVEL                = 1;

MIN_LUM_DEFAULT             = .1;

MAX_LUM_DEFAULT             = 1.0;

OFFSET_LUM_DEFAULT            = 0;

OUTPUT_FONT_SIZE_DEFAULT    = 3;

CHARMAP_DEFAULT                = 'luminance';
 
ROWS_DEFAULT                 = 24

COLS_DEFAULT                 = 80
 
MAX_RGB                        = 255

MAX_F_RGB                    = float(MAX_RGB)
 
def normalizePixel( rgb ):

    return rgb[0]/MAX_F_RGB,rgb[1]/MAX_F_RGB,rgb[2]/MAX_F_RGB
 
def getLuminancePixel( rgb ):

    nR,nG,nB = normalizePixel( rgb )

    return nR*0.299 + nG*0.587 + nB*0.114
 
def output( val, vLevel=0 ):

    if vLevel <= VERBOSE_LEVEL:

        print ( val )
 
def main( args ):
 
    global VERBOSE_LEVEL;
 
    parser = OptionParser()

    parser.add_option("-f", "--file", action='append', dest="files", help="process these files", metavar="LIST")

    parser.add_option(        "--characters", action="store", dest="characters", help="characters to use")

    parser.add_option(        "--character_map", action="store", dest="characterMap", help="maps characters: luminance, order, random")

    parser.add_option("-r", "--rows", action="store", dest="rows", help="number of rows")

    parser.add_option("-c", "--columns", action="store", dest="columns", help="number of columns")

    parser.add_option(        "--min_luminance", action="store", dest="minLuminance", help="min luminance value to clip at black")

    parser.add_option(        "--max_luminance", action="store", dest="maxLuminance", help="max luminance value to clip at white")

    parser.add_option(        "--offset_luminance", action="store", dest="offsetLuminance", help="offset luminance value")

    parser.add_option(        "--output_font_size", action="store", dest="outputFontSize", help="output font size in px")

    parser.add_option('-v', "--verbose", action="store", dest="verbose", help="verbosity: 0=None, 1=completion output, 2=image info, 3=pixel blending info")
 
    (options, args) = parser.parse_args( args )
 
    files             = options.files;

    characters         = options.characters;

    characterMap    = options.characterMap;

    rows            = options.rows;

    columns            = options.columns;

    minLum            = options.minLuminance;

    maxLum            = options.maxLuminance;

    offsetLum        = options.offsetLuminance;

    outputFontSize    = options.outputFontSize;

    verbose            = options.verbose;
 
    errors = [];

    # SANITY CHECKS
 
    if verbose:

        try:

            VERBOSE_LEVEL = int(verbose);

        except:

            VERBOSE_LEVEL = VERBOSE_LEVEL;
 
    if not files:

        errors.append('Failed to get files: make sure you specify files to use');

    if not characters:

        characters = []

        for i in range( 125-32):

            characters.append( chr( i + 33) );

    else:

        characters = str(characters);
 
    if characterMap:

        if characterMap.lower() in ('luminance','order','random'):

            characterMap = characterMap.lower();

        else:

            characterMap = CHARMAP_DEFAULT;

    else:

        characterMap = CHARMAP_DEFAULT;
 
    try:

        rows = int(rows);

    except:

        rows = ROWS_DEFAULT;

    try:

        columns = int(columns);

    except:

        columns = COLS_DEFAULT;
 
    try:

        minLum     = float( minLum)

    except:

        minLum = MIN_LUM_DEFAULT

    try:

        maxLum     = float( maxLum)

    except:

        maxLum = MAX_LUM_DEFAULT
 
    try:

        offsetLum     = int( offsetLum)

    except:

        offsetLum = OFFSET_LUM_DEFAULT
 
    try:

        outputFontSize     = int( outputFontSize)

    except:

        outputFontSize = OUTPUT_FONT_SIZE_DEFAULT
 
    if errors:

        for err in errors:

            output( 'ERROR: %s'%err, 0);

        return -1;
 
    output( 'verbose: %s'%verbose    , 3 );

    output( 'files: %s'%files        , 3 );

    output( 'characters: %s'%characters    , 3 );

    output( 'character_map: %s'%characterMap    , 3 );

    output( 'rows: %s'%rows    , 3 );

    output( 'columns: %s'%columns    , 3 );

    output( 'minLum: %s'%minLum    , 3 );

    output( 'maxLum: %s'%maxLum    , 3 );

    output( 'offsetLum: %s'%offsetLum    , 3 );

    output( 'outputFontSize: %s'%outputFontSize    , 3 );
 
    imgChr = Image.new("RGBA",(64,64))

    drwObj = ImageDraw.Draw(imgChr)

    fntObj = ImageFont.truetype("courbi.ttf",13)
 
    # build the value table

    lumLUT_Tmp         = list();

    lumLUT         = list();

    lumToCharTmp     = dict();

    maxLum         = 0.0;

    minLum         = 1.0;

    for ch in characters:
 
        w,h = fntObj.getsize(ch)

        drwObj.rectangle([0,0,64,64], fill=0)

        drwObj.text((0,0),ch,font=fntObj,fill=0xffffff)

        diff = 0

        r0 = 0

        g0 = 0

        b0 = 0
 
        lum = 0;

        for a in range(16):

            for b in range(8):

                lum += getLuminancePixel( imgChr.getpixel((b,a)) )

        lum = lum/(16*8)

        lumLUT_Tmp.append( lum )

        lumToCharTmp[lum] = ch ;
 
        if lum > maxLum:

            maxLum = lum;

        if lum < minLum:

            minLum = lum;
 
        output( ('ch: %s\t(%sx%s) lum:%s'%(ch,w,h,lum)), 3);

    lumToChar     = dict();

    for lum in lumLUT_Tmp:

        nLum = (lum-minLum)/(maxLum-minLum);

        lumToChar[nLum] = lumToCharTmp[lum];

        lumLUT.append( nLum );
 
    lumLUT.sort();
 
    for file in files:

        tImage = time.time()

        imgSrc = Image.open(file) 

        iw,ih = imgSrc.size;

        cellW = iw/columns;

        cellH = ih/rows;

        #~ print '\n%sx%s  %sx%s'%(cellW,cellH, iw, ih)

        sVal=""

        index=0

        for x in range(rows):

            for y in range(columns):

                ch = ""

                maxdiff = 0xffffff
 
                iLum = 0;

                r = 0;

                g = 0;

                b = 0;

                for xCell in range(cellH):

                    for yCell in range(cellW):

                        color = imgSrc.getpixel((yCell+(y*cellW),xCell+(x*cellH)));

                        r += color[0]

                        g += color[1]

                        b += color[2]
 
                # average        

                r = r/(cellH*cellW*1.0);

                g = g/(cellH*cellW*1.0);

                b = b/(cellH*cellW*1.0);
 
                hexColor = '%.2x%.2x%.2x'%( r+offsetLum,g+offsetLum,b+offsetLum );
 
                # normalize

                iLum += getLuminancePixel( (r,g,b) )
 
                #~ r /= MAX_F_RGB;

                #~ g /= MAX_F_RGB;

                #~ b /= MAX_F_RGB;
 
                if characterMap == 'luminance' :

                    ix = 0;

                    for lum in lumLUT:

                        if iLum < MIN_LUM_DEFAULT:

                            ch = ' ';

                            break;

                        if iLum > MAX_LUM_DEFAULT:

                            ch = lumToChar[lumLUT[-1]];

                            break;

                        if lum > iLum:

                            try:

                                ch = lumToChar[lumLUT[ix]];

                            except:

                                ch = lumToChar[lumLUT[0]]

                            break;

                        ix+=1;
 
                elif characterMap == 'order':

                    if index >= len(characters):

                        index=0;

                    ch = characters[index];

                elif characterMap == 'random':

                    ch = characters[int(random.random()*len(characters))];
 
                index+=1

                if(ch == " "):

                    ch="&nbsp;"

                #~ output( 'Character: %s'%ch, 3);

                output( ('character: %s\trow:%s column:%s\tlum: %s\tr:%s g:%s b:%s\thex_color:%s'%(ch,x,y,iLum,r,g,b,hexColor)), 3);

                sVal += '''<font size="%spx" color="#%s">%s</font></td>'''%(outputFontSize,hexColor,ch);

            sVal += '<br/>';

        sVal= "<html><body bgcolor=\"#000000\"><pre>"+sVal+"</pre><br/>\n<img src=\"%s\"/>\n</body></html>"%file

        try:

            f = open("%s.html"%file,"w")

            f.write(sVal)

            f.close()

        except:

            output('Failed to write file: %s'%file, 0 );
 
        output( ('%s  (%sx%s : %sx%s)'%(file,iw,ih,cellW,cellH)).center(50,'.'), 2)

        output( 'IMAGE PROCESS TIME: %s (sec)\t%s'%((time.time()-tImage),os.path.basename(file)), 1);
 
    output( '%s\nTOTAL PROCESS TIME: %s (sec)'%('-'*100, (time.time()-t0) ), 1);
 
if __name__=='__main__':

    args = sys.argv;
 
    args += [

        #~ '--file','./angry_birds.jpg',

        #~ '--characters','-+=@!?%$#^&*()[]{}_\\/><,.`~',

        #~ '-r','80', '-c','260',

        #~ '--output_font_size','1',

        #~ '--character_map','random',

        #~ '--character_map','order',

        #~ '-v', '3',
 
    ]
 
    sys.exit( main( args ) );

--------------------------------------

Mar 20 '12 #2

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