Python Image 模块，frombuffer() 实例源码

def open_svg_as_image(fn, width, height):
    for i in range(10):
        try:
            tmpfd, tmppath = tempfile.mkstemp(".png")
            tmpfile = os.fdopen(tmpfd,'w')

            file = StringIO.StringIO()
            svgsurface = cairo.SVGSurface (file, width, height)
            svgctx = cairo.Context(svgsurface)
            svg = rsvg.Handle(file=fn)
            svgwidth = svg.get_property('width')
            svgheight = svg.get_property('height')
            svgctx.scale(width/float(svgwidth),height/float(svgheight))
            svg.render_cairo(svgctx)

            svgsurface.write_to_png(tmpfile)
            svgsurface.finish()
            tmpfile.close()

            tmpfile = open(tmppath, 'r')
            imgsurface = cairo.ImageSurface.create_from_png(tmpfile)
            imgwidth = imgsurface.get_width()
            imgheight = imgsurface.get_height()

            data = imgsurface.get_data()

            im = Image.frombuffer("RGBA",(imgwidth, imgheight), data ,"raw","RGBA",0,1)
            os.remove(tmppath)
            break
        except MemoryError:
            print 'Memory Error. Try again ...'
            continue
    else:
        raise Exception('Problem loading image {0}'.format(fn))
    return im

def array2PIL(arr, size):
    mode = 'RGBA'
    arr = arr.reshape(arr.shape[0]*arr.shape[1], arr.shape[2])
    if len(arr[0]) == 3:
        arr = numpy.c_[arr, 255*numpy.ones((len(arr),1), numpy.uint8)]
    return Image.frombuffer(mode, size, arr.tostring(), 'raw', mode, 0, 1)