Re: [Matplotlib-users] imshow() and pixel intensity

[Amit S. <ami...@gm...>]

Got my answer here:
http://stackoverflow.com/questions/30301986/matplotlib-imshow-and-pixel-intensity



On Sun, May 17, 2015 at 10:02 PM, Amit Saha <ami...@gm...> wrote:
> Hi all,
>
> Just trying to understand how the value of the matrix fed to imshow()
> function determines the intensity of the pixel in grey scale mode.
> Consider the example code:
>
> import random
> import matplotlib.pyplot as plt
> import matplotlib.cm as cm
>
> def pixels(n=3):
>     pixel_data = []
>     for _ in range(n):
>         row = []
>         for _ in range(n):
>             row.append(random.randint(1, 10))
>         pixel_data.append(row)
>     return pixel_data
>
> if __name__ == '__main__':
>     pixel_data = pixels()
>     print(pixel_data)
>     plt.imshow(pixel_data, origin='lower', cmap=cm.Greys_r)
>     plt.show()
>
>
> The pixel_data here is the 3*3 "matrix":
> [[7, 4, 6], [7, 7, 6], [4, 7, 9]]
>
> How does the values here determine what shade of grey I see in the image?
>
> Thank you in advance.
>
> Best,
> Amit.
>
>
> --
> http://echorand.me



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