[英]How to scale up an image in Python with an image module?
無法附加圖像,但未填充新的4像素塊。 它交替並在兩個通道中留下黑色像素。
def scale_up(img):
"""
(Image object) -> Image object
Returns a copy of img that is blown up by a factor of 2. The new
image is twice as wide and twice as high. Each pixel in the original
image is mapped to the corresponding 4 pixels in new image.
"""
w = img.width()
h = img.height()
scale_up_img = image.new_image(w * 2, h * 2)
# loop over every (x,y) pair
for x in range(w):
for y in range(h):
# get rgb values
r, g, b = img.get_rgb(x, y)
scale_up_img.set_rgb(x * 2 + 1, y * 2 + 1, r, g, b)
scale_up_img.set_rgb(x * 2, y * 2, r, g, b)
return scale_up_img # return img object
由於每個輸出像素由一個輸入像素的4個副本組成,因此需要4條語句來進行設置。
scale_up_img.set_rgb(x * 2 + 1, y * 2 + 1, r, g, b)
scale_up_img.set_rgb(x * 2 + 1, y * 2, r, g, b)
scale_up_img.set_rgb(x * 2, y * 2 + 1, r, g, b)
scale_up_img.set_rgb(x * 2, y * 2, r, g, b)
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