Demo-Spatial Transformations

[ashwani-rathee]

Demo for cropping,resizing and rescaling has been added with this and address issue #130

closes #130

[johnnychen94]

Even though these are basic operations, it is a very nice explanation and I'm impressed!

I've left tons of format and language suggestions, hope you don't mind.

Two other things I also wish to see in this demo are:

• image rotation: imrotate
• image flip: reverse. Note that there are two flip options: flip the image data or flip the image axes.

[ashwani-rathee]

Can I make another demo for other transformations?? This has three operations which seems just the right amount for one demo I think.

[johnnychen94]

Of course.

And feel free to resolve the comments I added.

[johnnychen94]

Is this PR done? ( I guess you're still playing with PaddedViews things?)

[ashwani-rathee]

I think so,I will change the image simple view to @view version and add padded view example .But how do I convert padded view array to image??

[johnnychen94]

But how do I convert padded view array to image??

Can you explain this more? I'm not sure if I understand your question clearly.

You don't need to convert a PaddedView array to image, because in JuliaImages, every colorant array is a valid image, i.e., AbstractArray{<:Colorant}.

[ashwani-rathee]

In pluto,when we use PaddedView the array doesn't directly convert to image or maybe I am missing something

[johnnychen94]

This is probably a Pluto issue; If I get it correctly, it implements a different image display pipeline and not using ImageShow:

In IJulia, it is displayed as an image:

[johnnychen94]

The duplicated ImageShow here.

Might be more concise to just import Images if we have a lot of packages to import

Suggested change

	using ImageCore, ImageShow, ImageTransformations, TestImages, OffsetArrays, ImageShow
	using Images, TestImages, OffsetArrays

[johnnychen94]

Welcome as a contributor to JuliaImages! @ashwani-rathee

[ashwani-rathee]

:)