I'm trying to operate on just one dimension of an Array of 3 dimensions, 
but getting this: ERROR: DimensionMismatch("*")

The steps I'm doing are:

img = imread("path-to-image")
img_float = convert(Array, img) / 255

img_float becomes of type Array{Float64,3}
And trying to modify the first dimension like this:

img_float[:,:,1] = img_float[:,:,1] + (img_float[:,:,1] * 0.5)

This line gives the error: ERROR: DimensionMismatch("*")

What's the appropriate way?

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