add hue color edit filter

[vaderdan]

@muukii 😉

#8

[muukii]

@vaderdan
I was not able to find ColorControl.swift in this PR.
How can I see it?

[vaderdan]

@muukii sorry I forgot to add it

[muukii]

@vaderdan
Okay, Thank you.
I'll check this with launching demo application.

I think using CIHueAdjustment is better named as HueControl.
Because Color means highlight-tint and shadow-tint on Instagram.

And HSL I said is meaning following control.

I think that will need some shaders.

[muukii]

But, the code you write is pretty good.

[muukii]

Firstly, I think I want to add only the code of PixelEngine layer.
Next, We need to think about name of control and icon.
About icon, our designer will create that.

[vaderdan]

What do you mean shaders metal or opengl or custom CImage filter
http://flexmonkey.blogspot.com/2016/03/creating-selective-hsl-adjustment.html

what do you think about the link

[muukii]

@vaderdan
Sorry
shader which means shader with Metal Shading Language.
Instagram does not have that feature.
Instead, VSCO has one. HSL

Color should be this control.

We already have the code for this.
https://github.com/muukii/Pixel/blob/master/From%20Fil/FilterHighlightShadowTint.swift
But it does not have UI.

[muukii]

Hi, Thank you for your implementation.

I think using CAShapeLayer will be better than drawing.
Because CAShapeLayer can animate.

CoreCircle : CAShapeLayer
SelectingBorderCircle: CAShapeLayer

What do you think?

[vaderdan]

Yeah I'll do that, I'll try to get them animated in another pull request