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70 lines
1.7 KiB
Python
70 lines
1.7 KiB
Python
from collections import namedtuple
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class Pixel(namedtuple('Pixel', ['r', 'g', 'b'])):
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def _verify(self):
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if max(self.r, self.g, self.b) > 255:
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raise ValueError('Some component too bright.')
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if min(self.r, self.g, self.b) < 0:
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raise ValueError('Some component negative.')
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def __add__(self, other):
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return Pixel(
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self.r + other.r,
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self.g + other.g,
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self.b + other.b,
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)
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def __mul__(self, other):
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if not isinstance(other, int) or not isinstance(other, float):
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raise ValueError('Can only multiply by number')
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return Pixel(
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other*pixel.r,
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other*pixel.g,
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other*pixel.b,
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)
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def weighted_average(p1, w1, p2, w2):
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too_big = w1*p1 + w2*p2
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coef = 1/(w1+w2)
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return coef * too_big
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class Picture:
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def __init__(self, data):
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self.pixels = data
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self.w = len(data[0])
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self.h = len(data)
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@classmethod
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def load(cls, filename):
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from PIL import Image
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im = Image.open(filename)
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ht = im.height
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wt = im.width
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data = []
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access = im.getdata().pixel_access()
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for x in range(wt):
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line = []
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for y in range(ht):
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line.append(Pixel(*(access[x, y][:3])))
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data.append(line)
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result = cls(data)
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assert result.w == wt
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assert result.h == ht
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return result
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def show(self): ...
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class Interpolator:
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def interpolate(self, picture, new_h, new_w):
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quantum_x = new_w / picture.w
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quantum_y = new_h / picture.h
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result = [[None for _ in range(new_w)] for _ in range(new_h)]
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for x in range(new_w):
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for y in range(new_h):
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result[y][x] = self.get_pixel(picture, x, y, result, quantum_x, quantum_y)
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return Picture(result)
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def get_pixel(self, picture, x, y, result, quantum_x, quantum_y):
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raise NotImplementedError('You write this :-)')
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