Color Contrast Math

Color 1.M

let
    //Get values 0 - 255
    Source = Values,
    //Call that column R for Red
    #"R Dec" = Table.RenameColumns(Source,{{"Column1", "R Dec"}}),
    //Crossjoin to Values to get Green values 0 - 255
    #"G Dec" = Table.AddColumn(#"R Dec", "Custom", each Values),
    #"Expanded G Dec" = Table.ExpandTableColumn(#"G Dec", "Custom", {"Column1"}, {"G Dec"}),
    //Crossjoin to Values to get Blue values 0 - 255
    #"B Dec" = Table.AddColumn(#"Expanded G Dec", "B", each Values),
    #"Expanded B Dec" = Table.ExpandTableColumn(#"B Dec", "B", {"Column1"}, {"B Dec"}),
    //Get hexidecimal values for R,G,B
    #"R Hex" = Table.AddColumn(#"Expanded B Dec", "R Hex", each Text.End("000" & Number.ToText([R Dec], "x"),2)),
    #"G Hex" = Table.AddColumn(#"R Hex", "G Hex", each Text.End("000" & Number.ToText([G Dec], "x"),2)),
    #"B Hex" = Table.AddColumn(#"G Hex", "B Hex", each Text.End("000" & Number.ToText([B Dec], "x"),2)),
    //Concatenate to get full 6-digit Hex color value
    #"Changed Hex Type" = Table.TransformColumnTypes(#"B Hex",{{"R Hex", type text}, {"G Hex", type text}, {"B Hex", type text}}),
    #"Full Hex" = Table.AddColumn(#"Changed Hex Type", "Hex", each [R Hex] & [G Hex] & [B Hex]),
    //Convert integers to decimals and linearize
    #"R Lin" = Table.AddColumn(#"Full Hex", "R Lin", each ColorConvert(([R Dec]/255))),
    #"G Lin" = Table.AddColumn(#"R Lin", "G Lin", each ColorConvert(([G Dec]/255))),
    #"B Lin" = Table.AddColumn(#"G Lin", "B Lin", each ColorConvert(([B Dec]/255))),
    //Calculate luminance with the linearized values
    #"Luminance" = Table.AddColumn(#"B Lin", "Luminance", each 0.2126 * [R Lin] + 0.7152 * [G Lin] + 0.0722 * [B Lin]),
    #"Changed Luminance Type" = Table.TransformColumnTypes(#"Luminance",{{"Luminance", type number}}),
    //Create a column for hexidecimal value with the hash/pound at the beginning
    #"Hex Dup" = Table.DuplicateColumn(#"Changed Luminance Type", "Hex", "Hex With Hash"),
    #"Hex with Hash" = Table.TransformColumns(#"Hex Dup", {{"Hex With Hash", each "#" & _, type text}}),
    //Remove Hex and linearized RGB columns to keep model under 1 GB limit for Pro license
    #"Removed Columns" = Table.RemoveColumns(#"Hex with Hash",{"R Hex", "G Hex", "B Hex", "R Lin", "G Lin", "B Lin", "Hex"}),
    //Rename Hex with Hash to Hex
    #"Renamed Columns" = Table.RenameColumns(#"Removed Columns",{{"Hex With Hash", "Hex"}})
in
    #"Renamed Columns"

Color 2.M

let
    Source = #"Color 1"
in
    Source

ColorConvert.M

(colornum as number) =>
let 
    Source = if colornum < .04045 then colornum/12.92 else  Number.Power(((colornum+0.055)/1.055),2.4)
in
    Source

Values.M

let
    Source = List.Numbers(0,256),
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Changed Type" = Table.TransformColumnTypes(#"Converted to Table",{{"Column1", Int64.Type}})
in
    #"Changed Type"