Converts to RGBA and creates a 1-unit square for each pixel

README.markdown

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+# png2svg
+
+Converts PNG images to SVG. 
+
+## Usage
+
+    png2svg input.png > output.svg

png2svg.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import sys
+import Image
+
+from StringIO import StringIO        
+
+def rgba_image_to_svg(im):
+    s = StringIO()
+    s.write("""<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg>\n""")
+
+    width, height = im.size
+    for x in range(width):
+        for y in range(height):
+            rgba = im.getpixel((x, y))
+            s.write("""  <rect x="%d" y="%d" width="1" height="1" style="fill:rgb%s; fill-opacity:%f; stroke:none;" />\n""" % (x, y, rgba[0:3], float(rgba[3])))
+    s.write("""</svg>\n""")
+    return s.getvalue()
+
+def png_to_svg(filename):
+    try:
+        im = Image.open(filename)
+    except IOError, e:
+        sys.stderr.write('%s: Could not open as image file\n' % filename)
+        sys.exit(1)
+    im_rgba = im.convert('RGBA')
+    
+    print rgba_image_to_svg(im_rgba)
+    
+
+
+if __name__ == "__main__":
+    assert len(sys.argv) == 2, "Usage: %s [FILE]"
+    png_to_svg(sys.argv[1])

test/generation/test.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="64"
+   height="48"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.48.0 r9654"
+   sodipodi:docname="test.svg"
+   inkscape:export-filename="/home/ian/jobs/png2svg/test/test.png"
+   inkscape:export-xdpi="90"
+   inkscape:export-ydpi="90">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="10.6875"
+     inkscape:cx="32"
+     inkscape:cy="24"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="808"
+     inkscape:window-height="824"
+     inkscape:window-x="975"
+     inkscape:window-y="180"
+     inkscape:window-maximized="0" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-1004.3622)">
+    <path
+       sodipodi:type="arc"
+       style="fill:#00d455;fill-opacity:1;stroke:#0000ff;stroke-width:2.14815535;stroke-miterlimit:4;stroke-dasharray:none"
+       id="path3030"
+       sodipodi:cx="22.081871"
+       sodipodi:cy="17.964912"
+       sodipodi:rx="11.040936"
+       sodipodi:ry="10.573099"
+       d="m 33.122808,17.964912 a 11.040936,10.573099 0 1 1 -22.081873,0 11.040936,10.573099 0 1 1 22.081873,0 z"
+       transform="matrix(1.2320419,0,0,1.5830173,-8.539125,997.35032)" />
+    <rect
+       style="fill:#aa0000;fill-opacity:0.50000000000000000;stroke:#000000;stroke-width:3;stroke-miterlimit:4;stroke-dasharray:none"
+       id="rect3032"
+       width="34.678898"
+       height="29.719835"
+       x="23.596224"
+       y="1017.5724" />
+  </g>
+</svg>