TypeError: integer argument expected, got float when converting an image to greyscale

Question

I am using the following code to convert a color image to a grayscale image. Why does it throw a TypeError?

#!/usr/bin/python
from PIL import Image
im = Image.open("Penguins.jpg")
pixel = im.load()
width, height = im.size
for x in range(width):
    for y in range(height):
        R,G,B = pixel[x,y]
        pixel[x,y] = ((0.299*R+0.587*G+0.114*B),(0.299*R+0.587*G+0.114*B),(0.299*R+0.587*G+0.114*B))

im.save("Penguins_new.jpg")

Have you considered that you are passing a float and not an integer? — Zizouz212
– Zizouz212, Commented Apr 10, 2015 at 18:48
Have a look at my answer. It will hopefully solve your solution. — Zizouz212
– Zizouz212, Commented Apr 10, 2015 at 18:53

Zizouz212 · Accepted Answer · 2015-04-10 18:52:17Z

9

The argument that you are passing to pixel[x, y] needs to be an int, not a float. Try casting it as an integer.

pixel[x, y] = ((int(0.299*R) + int(...

answered Apr 10, 2015 at 18:52

Zizouz212

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9 Comments

唐笙凱 Over a year ago

but the question is float ~"~

Blacklight Shining Over a year ago

That's not a cast; it's a constructor call. Python doesn't have casts.

Zizouz212 Over a year ago

You can think of it as a conversion then. And then the same can be said for that python doesn't have constructors either. People use different terminology. Don't start a war, just keep it simple. And, also, the reason that you are getting the error, is because the function does not want a float, but rather an integer. So you can't pass a float, you have to pass an integer.

唐笙凱 Over a year ago

If I want to pass a float, what function should I use?

Zizouz212 Over a year ago

@BlacklightShining Also, that has to do with classes, not types. You should figure out the difference between the two.

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