Accessing Color3.h, Color3.s, and Color3.v?

I'm trying to make color sliders for my game. Originally, I was using RGB values, and everything was fine. However, I decided that HSV sliders might be better. So, when I changed all of the "Color3.new" to "Color3.fromHSV", it no longer worked, technically. The color value always output as (0, 0, 0). I believe this is because, while I can access Color3.r, g, and b, I can't access Color3.h, s, and v. This is a problem, because I only want to change one property at a time; one property is a variable, and the rest I would hypothetically want to use ImageColor3.s, or ImageColor3.v. How could I do something like this?

Here's the code, if it helps. Around line 28 is the problem in question. It works just fine if I switch Color3.fromHSV to Color3.new.

local UIS = game:GetService("UserInputService")
local RuS = game:GetService("RunService")
local slider = script.Parent.Slider
local bar = script.Parent
local held = false
local customcolor = script.Parent.Parent.CustomColor

function snap(number, factor)
	if factor == 0 then
		return number
	else
		return math.floor(number/factor+0.5)*factor
	end
end

UIS.InputEnded:connect(function(input, processed)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		held = false
	end
end)

script.Parent.MouseButton1Down:connect(function()
	held = true
end)

RuS.RenderStepped:connect(function(delta)
	if held then
		script.Parent.Parent.CustomColor.ImageColor3 = Color3.fromHSV(slider.Position.X.Scale, customcolor.ImageColor3.G, customcolor.ImageColor3.B)
		local MousePos = UIS:GetMouseLocation().X
		local pos = snap((MousePos-bar.AbsolutePosition.X)/bar.AbsoluteSize.X,0.02)
		local percentage = math.clamp(pos,0,1)
		slider.Position = UDim2.new(percentage,0,slider.Position.Y.Scale, slider.Position.Y.Offset)
		wait()
	end
end)

This is what you need to convert your RGB into HSV. You need to convert RGB into HSV first and then HSV to RGB again since Color3 is Mainly RGB in the first place xD. I mean it's really necessary to have HSV if you have RGB color picker.

script.Parent.Parent.CustomColor.ImageColor3 = Color3.fromHSV(Color3.toHSV(customcolor.ImageColor3.R, customcolor.ImageColor3.G, customcolor.ImageColor3.B))

If you want to go for HSV color picker Image :) Have fun