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Properties
{
  [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
  //ここから
  _Red("AddRed", Float) = 150
  _Green("AddGreen", Float) = 150 
  _Blue("AddBlue", Float) = 150 
  //ここまで
  _Color ("Tint", Color) = (1,1,1,1)

  _StencilComp ("Stencil Comparison", Float) = 8
  _Stencil ("Stencil ID", Float) = 0
  _StencilOp ("Stencil Operation", Float) = 0
  _StencilWriteMask ("Stencil Write Mask", Float) = 255
  _StencilReadMask ("Stencil Read Mask", Float) = 255

  _ColorMask ("Color Mask", Float) = 15

  [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
}

…(中略)…

fixed3 shift_col(fixed3 RGB, half3 shift)
{
  fixed3 RESULT = fixed3(RGB);

  RESULT.x += shift.x / 255;
  RESULT.y += shift.y / 255;
  RESULT.z += shift.z / 255;

  return (RESULT);
}

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/// <summary>
/// 背景用のマテリアルの色を変える
/// </summary>
/// <param name="mat">変更するマテリアル</param>
/// <param name="col">RGBカラーで指定</param>
private void ChangeBackgroundMaterial(Material mat, Color col)
{
    mat.SetFloat("_Red", col.r * 255.0f);
    mat.SetFloat("_Blue", col.b * 255.0f);
    mat.SetFloat("_Green", col.g * 255.0f);
}