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replaced alpha composite function

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iou1name 2017-12-16 01:57:48 -05:00
parent 16c21d46bf
commit a92322b794
1 changed files with 9 additions and 40 deletions
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49
ascii.py
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@ -37,7 +37,7 @@ def scale_image(image, maxDim=100):
new_height = maxDim
aspect_ratio = original_width/float(original_height)
new_width = int(aspect_ratio * new_height)
image = image.resize((new_width, new_height), Image.ANTIALIAS)
image = image.resize((new_width, new_height))
return image
@ -141,46 +141,15 @@ def open_image(imagePath):
return image
def alpha_composite(front, back):
"""Alpha composite two RGBA images.
def alpha_composite(image, color=(255, 255, 255)):
"""
Alpha composite an RGBA Image with a specified color.
Source: http://stackoverflow.com/a/9166671/284318
Keyword Arguments:
front -- PIL RGBA Image object
back -- PIL RGBA Image object
"""
front = np.asarray(front)
back = np.asarray(back)
result = np.empty(front.shape, dtype='float')
alpha = np.index_exp[:, :, 3:]
rgb = np.index_exp[:, :, :3]
falpha = front[alpha] / 255.0
balpha = back[alpha] / 255.0
result[alpha] = falpha + balpha * (1 - falpha)
old_setting = np.seterr(invalid='ignore')
result[rgb] = (front[rgb] * falpha + back[rgb] * balpha * (1 - falpha)) / result[alpha]
np.seterr(**old_setting)
result[alpha] *= 255
np.clip(result, 0, 255)
# astype('uint8') maps np.nan and np.inf to 0
result = result.astype('uint8')
result = Image.fromarray(result, 'RGBA')
return result
def alpha_composite_with_color(image, color=(255, 255, 255)):
"""Alpha composite an RGBA image with a single color image of the
specified color and the same size as the original image.
Keyword Arguments:
image -- PIL RGBA Image object
color -- Tuple r, g, b (default 255, 255, 255)
"""
back = Image.new('RGBA', size=image.size, color=color + (255,))
return alpha_composite(image, back)
image.load() # needed for split()
background = Image.new('RGB', image.size, color)
background.paste(image, mask=image.split()[3]) # 3 is the alpha channel
return background
def image_to_ascii(image=None, reverse=False, brail=False, color=None,**kwargs):
@ -195,7 +164,7 @@ def image_to_ascii(image=None, reverse=False, brail=False, color=None,**kwargs):
if image.mode == "P":
image = image.convert(image.palette.mode)
if image.mode == "RGBA":
image = alpha_composite_with_color(image).convert("RGB")
image = alpha_composite(image).convert("RGB")
image = scale_image(image)