How do you change just the color of some pixels from an image that are not in a predefined list ? I tried something like this:
from PIL import Image
picture = Image.open("// location")
imshow (picture)
_colors = [[0, 128, 0], [128, 128, 0], [128, 128, 128], [192, 128, 0], [128, 64, 0], [0, 192, 0], [128, 64, 128], [0, 0, 0]]
width, height = picture.size
for x in range(0, width-1):
for y in range(0, height-1):
current_color = picture.getpixel( (x,y) )
if current_color!= _colors[0] and current_color!= _colors[1] and current_color!= _colors[2] and current_color!= _colors[3] and current_color!= _colors[4] and current_color!= _colors[5] and current_color!= _colors[6] and current_color!= _colors[7]:
picture.putpixel( (x,y), (0, 0, 0))
imshow (picture)
I want to make just some pixels black, but somehow this would return a black image altogether
This line :
if current_color!= _colors[0] and current_color!= _colors[1] and current_color!= _colors[2] and current_color!= _colors[3] and current_color!= _colors[4] and current_color!= _colors[5] and current_color!= _colors[6] and current_color!= _colors[7]:
always returns True
, so you iterate over the whole picture, changing it to black. getpixel
returns a tuple :
>>> print picture.getpixel((1, 1))
(79, 208, 248)
and you compare it to a list( [0,128,0]
). They are not the same:
>>> (1,2,3) == [1,2,3]
False
change colors
to a list of tuples rather than a list of lists.
keep the type of pixel data the same and shorten that if statement with an "in"
import Image
filename ="name.jpg"
picture = Image.open(filename, 'r')
_colors = [(0, 128, 0), (128, 128, 0), (128, 128, 128), (192, 128, 0), (128, 64, 0), (0, 192, 0), (128, 64, 128), (0, 0, 0)]
width, height = picture.size
for x in range(0, width):
for y in range(0, height):
current_color = picture.getpixel((x,y))
if current_color in _colors:
picture.putpixel((x,y), (0, 0, 0))
picture.show()
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