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1 #!/usr/bin/env python
2
3 """
4 Image to BASE64
5 ===============
6
7 Take an image file and encode it with BASE64. Put the encoded data in
8 an "img" HTML tag.
9
10 Author: Laszlo Szathmary, 2011 (jabba.laci@gmail.com)
11 Website: https://ubuntuincident.wordpress.com/2011/04/17/embed-images-in-html-pages/
12 GitHub: https://github.com/jabbalaci/Bash-Utils
13
14 Usage:
15 ------
16
17 ./img_to_base64.py <image_file>
18 By default, the data is nested in an HTML tag and the output
19 is wrapped. These settings can be customized.
20 The output is printed to the standard output.
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21
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22 Sample output:
23 --------------
24
25 <img class='inline-image' src='data:image/gif;base64,R0lGODlhIgAbAPMPAGxsbNbW1v
26 /rhf/ge//3kf/Ub9/f3/b29oeHh/7LZv/0juazTktLS8WSLf//mf///yH5BAAAAAAALAAAAAAiABsAA
27 ASA8MlJq7046827/2AojiTVnI1xlFZjBisruU7tPCiqjg2h/L9KA2HgCQS5pE7UGLgwAhyCWWjYrrWE
28 owFgJqyEsDi82HZDja/jyGaXuV7rYE6fv8+gtLXA7/OtcCEGSoQMUyEHAQgAjI2OAAgBIwcGAZaXmAE
29 7Mpydnp+goaKjFBEAOw==' />
30 """
31
32 import sys
33 import imghdr
34 import base64
35 import textwrap
36
37 # you can change the 'class' attribute or you can add more attributes
38 TEMPLATE = "<img class='inline-image'" + \
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39 " src='data:image/{0};base64,{1}' />"
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40
41 # format options
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42 HTML = 1 # one line, nested in TEMPLATE
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43 BASE64 = 2 # one line, pure base64 encoded output
44 HTML_WRAP = 3 # wrapped HTML output, nested in TEMPLATE
45
46 # width fot text wrap
47 HTML_WRAP_WIDTH = 79
48
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49
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50 def convert_to_base64(filename, image_type, format=HTML):
51 """Read the image file and encode it with base64.
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52
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53 Return the image file either in an HTML img tag or as plain base64 text.
54 """
55 img = open(filename, 'rb')
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56 data = base64.b64encode(img.read())
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57 img.close()
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58
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59 if format in [HTML, HTML_WRAP]:
60 text = TEMPLATE.format(image_type, data)
61 if format == HTML_WRAP:
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62 text = '\n'.join(textwrap.wrap(text, HTML_WRAP_WIDTH))
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63 return text
64 # else
65 if format == BASE64:
66 return data
67 # else
68 return ''
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69
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70
71 def main(args):
72 """Verify the format of the input file and print the base64 encoded text.
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73
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74 Supported file formats: 'png' and 'jpeg'.
75 """
76 filename = args[0]
77 image_type = imghdr.what(filename)
78
79 if image_type not in ['png', 'jpeg', 'gif']:
80 print "{0}: image file should be PNG, JPG or GIF.".format(sys.argv[0])
81 sys.exit(1)
82 # else
83 print convert_to_base64(filename, image_type, format=HTML_WRAP)
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84
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85
86 if __name__ == "__main__":
87 if len(sys.argv) == 1:
88 print "{0}: missing image file argument.".format(sys.argv[0])
89 sys.exit(0)
90 else:
91 main(sys.argv[1:])
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