Hi I am new to rust and attempting to learn enough to evaluate the language by writing in Rust a program that I have successfully written in Kotlin. I am probably going to ask some pretty stupid questions since the resource management is totally different to that with which I am familiar.

I will be processing an image hopefully on multiple threads at once. I have written the code to do grey scale conversion the hard way (as a stepping stone to something more useful):

• Load image
• Iterate through pixels (x, y) converting each to grey
• Write the image.

How do I get mutable sub-arrays so that I can use multiple threads. image::deref_mut looks interesting, but the docs look a little dense to my untrained eye:

`impl<P, Container> IndexMut<(u32, u32)> for ImageBuffer<P, Container>

where
P: Pixel + 'static,
P::Subpixel: 'static,
Container: Deref<Target = [P::Subpixel]> + DerefMut, `

I am assuming that the two parameters define the range of the sub array, but is this start,end or start,length? Is the resultant structure addressed as a one dimensonal array or a two dimensional array (unlikely).

My apologies if I am barking up the wrong kettle of fish.

Phill

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