Remove plain background, set it transparent

[bobJ]

Hello,

I have 1500 png to process so I'm searching a script/plugin to do this.

Given a png, I would like the script to do the following:
- do a magic selection (wand/fuzzy) with starting point coordinattes 1,1 (I know this pixel is the background color)
- remove this selection and have transparency instead

I tried this script in a plugin via BIMP:

Code:

def plugin_use_fuzzy(timg, tdrawable):
   
    pdb.gimp_layer_add_alpha(timg)
    pdb.gimp_image_select_contiguous_color(timg, 0, tdrawable, 1, 1)
    sel = pdb.gimp_image_get_selection(timg)
    pdb.gimp_edit_cut(sel)

But it does nothing.
Could you help me please?