Remove plain background, set it transparent

[bobJ]

Hi,
Thank you for your help.
I've finally got to remove my plain background using this as a plugin in BIMP:

Code:

def plugin_remove_plain_bg(timg, tdrawable):
   
    drawable = pdb.gimp_image_active_drawable(timg)
    pdb.gimp_image_select_color(timg, CHANNEL_OP_REPLACE, drawable, gimpcolor.RGB(149,85,79)) # 95554f
    pdb.gimp_edit_cut(drawable)

I was able to do this by selecting by color because my background is plain color.
Bonus: some isolated pixels had this color and were not contiguous with the background, so removing the entire color does the job the best way for me.