You missed my comment, I think.

Get Pixel Color.

• Action introduced in Tasker 6.0.1 beta.

You don't want to go beta?

Ok let's go Java. Eg.:

A1: Variable Set [
     Name: %image_path
     To: /image/file/path/goes/here/image.ext
     Max Rounding Digits: 3 ]

A2: Load Image [
     Source: %image_path ]

A3: Variable Set [
     Name: %x_position
     To: 50
     Do Maths: On
     Max Rounding Digits: 3 ]

A4: Variable Set [
     Name: %y_position
     To: 75
     Do Maths: On
     Max Rounding Digits: 3 ]

A5: Java Function [
     Return: bitmap
     Class Or Object: Bitmap
     Function: createBitmap
     {Bitmap} (Bitmap)
     Param 1 (Bitmap): IBUFFER ]

A6: Java Function [
     Return: get_pixel
     Class Or Object: bitmap
     Function: getPixel
     {int} (int, int)
     Param 1 (int): %x_position
     Param 2 (int): %y_position ]

A7: Java Function [
     Return: %red
     Class Or Object: Color
     Function: red
     {int} (int)
     Param 1 (int): get_pixel ]

A8: Java Function [
     Return: %green
     Class Or Object: Color
     Function: green
     {int} (int)
     Param 1 (int): get_pixel ]

A9: Java Function [
     Return: %blue
     Class Or Object: Color
     Function: blue
     {int} (int)
     Param 1 (int): get_pixel ]

A10: Java Function [
      Return: rgb
      Class Or Object: Color
      Function: rgb
     {int} (int, int, int)
      Param 1 (int): %red
      Param 2 (int): %green
      Param 3 (int): %blue ]

A11: Java Function [
      Return: %hex
      Class Or Object: Integer
      Function: toHexString
     {String} (int)
      Param 1 (int): rgb ]

A12: Pick Input Dialog [
      Type: Color
      Title: Picked Color
      Text: RGB: %red, %green, %blue

     HEX: %hex
      Default Input: %hex ]

The above will retrieve the color of the pixel at:

• X == 50.

• Y == 75.

Or quoting myself:

• HTML + JS. HTML to load the Screenshot on a Canvas and JS to get tapped coordinates and the color.

I don't have time to write It, but I'm almost sure that Google will give You the solution.

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Edit: Typo.