small plugin code help

[gimpygirl]

Hi

I have this plugin that just runs some other scripts and plugins.

I want to add the first 2 comments lines. Can somebody tell me if this is possible and fill in the required code?
The plugin works but the 2 first comment lines I don't know how to code it.

First I want to add an alpha layer to my image.

Then I want to apply "select by color" tool on a specified pixel (X and Y value of the pixel) and delete the selection from  the whole image automatically? Is this possible using code?

Code:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
from gimpfu import*


def test(timg, tdrawable):

#how to add alpha layer to my image?

#how to apply "select by color" tool on a specified pixel and delete the selection from  the whole image?

#determine the offset values manually
   pdb.gimp_drawable_offset(tdrawable, 0, 1, 18, -32)
   
   
#the image size is constant and 150x150 crops the border    
   pdb.gimp_image_crop(timg, 2400, 1200, 150, 150)
   
   
#guides using script-fu    
   pdb.script_fu_grid_guides(timg, 0, 150, 150, 1, 0)
   
   
#chop into 150x150 tiles    
   pdb.python_fu_ofn_guillotine_layer(timg, tdrawable)
   
   
#export all layers
   pdb.python_fu_ofn_export_layers(timg, os.path.dirname(timg.filename), "{numUp0}.png", "-", 0)
    
    
register(
       "test",
       "test",
       "test",
       "*",
       "*",
       "2024",
       "<Image>/Tools/test...",
       "*",
       [],
       [],
       test
       )

main()