Resize and crop captured image, and saves to output.
    (can be stream or filename)

def image_postprocess(imagefile, output, size, crop, render):
    """
    Resize and crop captured image, and saves to output.
    (can be stream or filename)
    """
    try:
        from PIL import Image
    except ImportError:
        import Image

    img = Image.open(imagefile)
    size_crop = None
    img_resized = img
    if size and crop and crop.lower() == 'true':
        width_raw, height_raw = img.size
        width, height = size
        height_better = int(height_raw * (float(width) / width_raw))
        if height < height_better:
            size_crop = (0, 0, width, height)

    try:
        if size_crop:
            size_better = width, height_better
            img_better = img.resize(size_better, Image.ANTIALIAS)
            img_resized = img_better.crop(size_crop)
        elif size:
            img_resized = img.resize(size, Image.ANTIALIAS)

        # If save with 'bmp' use default mode('RGBA'), it will raise:
        # "IOError: cannot write mode RGBA as BMP".
        # So, we need convert image mode
        # from 'RGBA' to 'RGB' for 'bmp' format.
        if render == 'bmp':
            img_resized = img_resized.convert('RGB')
        # Fix IOError: cannot write mode RGBA as XBM
        elif render == 'xbm':
            img_resized = img_resized.convert('1')
        # Works with either filename or file-like object
        img_resized.save(output, render)
    except KeyError:
        raise UnsupportedImageFormat
    except IOError as e:
        raise CaptureError(e)