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add image-dithering and resize instead of crop #22

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add image-dithering and resize instead of crop #22

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23 changes: 6 additions & 17 deletions sirius/coding/image_encoding.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,16 +9,6 @@
THRESHOLD = 127
TRANSLATE = [(1536, 255), (1152, 254), (768, 253), (384, 252), (251, 251)]


def pixel_to_bw(p):
if p == (0, 0, 0, 0): # 0 alpha means white.
return WHITE
elif p[0] > THRESHOLD or p[1] > THRESHOLD or p[2] > THRESHOLD:
return WHITE
else:
return BLACK


def ilen(i):
"Returns length of an iterator in constant space."
return sum(1 for _ in i)
Expand Down Expand Up @@ -56,15 +46,14 @@ def rle(lengths):
yield remainder


def crop_384(im):
def resize_384(im):
w, h = im.size
return im.crop((0, 0, 384, min(h, 10000)))

resize_width = 384
resize_height = resize_width * h / w
return im.resize((resize_width, resize_height), Image.ANTIALIAS)

def threshold(im):
thresholded = ''.join(pixel_to_bw(x) for x in im.convert('RGBA').getdata())
return Image.fromstring('L', im.size, thresholded)

return im.convert('1')

def rle_from_bw(bw_image):
"""
Expand Down Expand Up @@ -133,5 +122,5 @@ def default_pipeline(html):
"""Encode HTML into an RLE image."""
data = html_to_png(html)
image = Image.open(data)
image = crop_384(image)
image = resize_384(image)
return threshold(image)