【转载】python 图片转字符

本文转载自：http://blog.csdn.net/xuhang0910/article/details/50900258

首先安装pip 

$ sudo apt-get install Python-pip python-dev build-essential

$ sudo pip install –upgrade pip

$ sudo pip install –upgrade virtualenv

<code class="hljs python has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#coding=utf-8</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#灰度值公式：灰度值 ＝ 0.2126 * r + 0.7152 * g + 0.0722 * b</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">from</span> PIL <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> Image
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> argparse

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#获取参数</span>
IMG = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/home/xuhang/桌面/new/python小程序/画转字符/1.png'</span>
WIDTH = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">80</span>
HEIGHT = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">60</span>
OUTPUT = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/home/xuhang/桌面/new/python小程序/画转字符/p2c.txt'</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#所用的字符</span>
ascii_char = list(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. "</span>)

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 将256灰度映射到70个字符上</span>
<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">def</span> <span class="hljs-title" style="box-sizing: border-box;">get_char</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(r,b,g,alpha = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">256</span>)</span>:</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> alpha == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">' '</span>
length = len(ascii_char)
gray = int(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.2126</span> * r + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.7152</span> * g + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.0722</span> * b)

unit = (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">256.0</span> + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)/length
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> ascii_char[int(gray/unit)]

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> __name__ == <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'__main__'</span>:

im = Image.open(IMG)
im = im.resize((WIDTH,HEIGHT), Image.NEAREST)

txt = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">""</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> i <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> range(HEIGHT):
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> j <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> range(WIDTH):
txt += get_char(*im.getpixel((j,i)))
txt += <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\n'</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">print</span> txt

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># 字符画输出到文件</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> OUTPUT:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> open(OUTPUT,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'w'</span>) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> f:
f.write(txt)
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">with</span> open(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"output.txt"</span>,<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'w'</span>) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> f:
f.write(txt)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><
4000
;li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li></ul>

原图： 


 

结果

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