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POHow to improve watermark image in Python?
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copied!<p>I am using python for watermark image source code from <a href="http://code.activestate.com/recipes/362879/" rel="nofollow noreferrer">this</a> </p> <pre><code>import Image import ImageEnhance import random def _percent(var): """ Just a simple interface to the _val function with a more meaningful name. """ return _val(var, True) def _int(var): """ Just a simple interface to the _val function with a more meaningful name. """ return _val(var) def _val(var, is_percent=False): """ Tries to determine the appropriate value of a particular variable that is passed in. If the value is supposed to be a percentage, a whole integer will be sought after and then turned into a floating point number between 0 and 1. If the value is supposed to be an integer, the variable is cast into an integer. """ try: if is_percent: var = float(int(var.strip('%')) / 100.0) else: var = int(var) except ValueError: raise ValueError('invalid watermark parameter: ' + var) return var def reduce_opacity(img, opacity): """ Returns an image with reduced opacity. """ assert opacity >= 0 and opacity <= 1 if img.mode != 'RGBA': img = img.convert('RGBA') else: img = img.copy() alpha = img.split()[3] alpha = ImageEnhance.Brightness(alpha).enhance(opacity) img.putalpha(alpha) return img def determine_scale(scale, img, mark): """ Scales an image using a specified ratio or 'F'. If `scale` is 'F', the image is scaled to be as big as possible to fit in `img` without falling off the edges. Returns the scaled `mark`. """ if scale: try: scale = float(scale) except (ValueError, TypeError): pass if type(scale) in (str, unicode) and scale.lower() == 'f': # scale, but preserve the aspect ratio scale = min( float(img.size[0]) / mark.size[0], float(img.size[1]) / mark.size[1] ) elif type(scale) not in (float, int): raise ValueError( 'Invalid scale value "%s"! Valid values are 1) "F" for ratio-preserving scaling and 2) floating-point numbers and integers greater than 0.' % ( scale,)) # determine the new width and height w = int(mark.size[0] * float(scale)) / 2 h = int(mark.size[1] * float(scale)) / 2 print w, h # apply the new width and height, and return the new `mark` return (w, h) else: print 'Mark Size', mark.size return mark.size def determine_rotation(rotation, mark): """ Determines the number of degrees to rotate the watermark image. """ if (isinstance(rotation, str) or isinstance(rotation, unicode)) \ and rotation.lower() == 'r': rotation = random.randint(0, 359) else: rotation = _int(rotation) return rotation def determine_position(position, img, mark): """ Options: TL: top-left TR: top-right BR: bottom-right BL: bottom-left C: centered R: random X%xY%: relative positioning on both the X and Y axes X%xY: relative positioning on the X axis and absolute positioning on the Y axis XxY%: absolute positioning on the X axis and relative positioning on the Y axis XxY: absolute positioning on both the X and Y axes """ max_left = max(img.size[0] - mark.size[0], 0) max_top = max(img.size[1] - mark.size[1], 0) if not position: position = 'r' if isinstance(position, tuple): left, top = position elif isinstance(position, str) or isinstance(position, unicode): position = position.lower() # corner positioning if position in ['tl', 'tr', 'br', 'bl']: if 't' in position: top = 0 elif 'b' in position: top = max_top if 'l' in position: left = 0 elif 'r' in position: left = max_left # center positioning elif position == 'c': left = int(max_left / 2) top = int(max_top / 2) # random positioning elif position == 'r': left = random.randint(0, max_left) top = random.randint(0, max_top) # relative or absolute positioning elif 'x' in position: left, top = position.split('x') if '%' in left: left = max_left * _percent(left) else: left = _int(left) if '%' in top: top = max_top * _percent(top) else: top = _int(top) print 'top left', left, top return (left, top) def watermark(img, mark, position=(0, 0), opacity=1, scale=1.0, tile=False, greyscale=False, rotation=0, return_name=False, **kwargs): """ Adds a watermark to an image. """ if opacity < 1: mark = reduce_opacity(mark, opacity) if type(scale) != tuple: scale = determine_scale(scale, img, mark) print 'mark mode', mark.mode mark = mark.resize(scale) if greyscale and mark.mode != 'LA': mark = mark.convert('LA') rotation = determine_rotation(rotation, mark) if rotation != 0: # give some leeway for rotation overlapping new_w = mark.size[0] new_h = mark.size[1] new_mark = Image.new('RGBA', (new_w, new_h), (0, 0, 0, 0)) # new_mark.putalpha() # center the watermark in the newly resized image new_l = (new_w - mark.size[0]) / 2 new_t = (new_h - mark.size[1]) / 2 new_mark.paste(mark, (new_l, new_t)) mark = new_mark.rotate(rotation, Image.BICUBIC, expand=True) position = determine_position(position, img, mark) print 'image mode', img.mode print 'mark mode', mark.mode if img.mode != 'RGBA': img = img.convert('RGBA') print 'image ---', img.mode alpha = img.split()[3] alpha = ImageEnhance.Brightness(alpha).enhance(opacity) img.putalpha(alpha) # make sure we have a tuple for a position now assert isinstance(position, tuple), 'Invalid position "%s"!' % position # create a transparent layer the size of the image and draw the # watermark in that layer. layer = Image.new('RGBA', img.size, (0, 0, 0, 0)) if tile: first_y = position[1] % mark.size[1] - mark.size[1] first_x = position[0] % mark.size[0] - mark.size[0] for y in range(first_y, img.size[1], mark.size[1]): for x in range(first_x, img.size[0], mark.size[0]): layer.paste(mark, (x, y)) else: layer.paste(mark, position) # composite the watermark with the layer return Image.composite(layer, img, layer) def test(): im = Image.open('/home/chanhle/0450034_a (4th copy).jpg') mark = Image.open('/home/chanhle/UMA LOGO.png') # im.save('/home/chanhle/0120047_a.png') watermark(im, mark, position='C', opacity=0.8, scale='f', rotation=45).save('/home/chanhle/test3.jpg', 'JPEG') if __name__ == '__main__': test() </code></pre> <p>This is Image I want to watermark <img src="https://i.stack.imgur.com/4D4C3.jpg" alt="Orignal Image"> here is logo <img src="https://i.stack.imgur.com/Nvewa.png" alt="Logo Image"></p> <p>and result when run code above <img src="https://i.stack.imgur.com/PT4iz.jpg" alt="Result Image"></p> <p><strong>Result when I use online tools it's beautiful.</strong> <img src="https://i.stack.imgur.com/voy5f.jpg" alt="enter image description here"> As you see in result logo watermark is not sharp enough it's not beautiful as I expected. How to improve this quality? Thank for support.</p>

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