Gimp python-fu plugin to resize and set the image's data type.

stage-graphic.py

#!/usr/bin/env python

from gimpfu import *

def stage_graphic(image, drawable):
	pdb.gimp_context_set_interpolation(0)
	pdb.gimp_image_scale(image, pdb.gimp_image_width(image) * 4, pdb.gimp_image_height(image) * 4)

	if (pdb.gimp_image_base_type(image)):
		pdb.gimp_image_convert_rgb(image)

register(
    'stage-graphic',
    'Prepares an image for editing',
    'Prepares an image for editing',
    'Shoeboxam',
    'Shoeboxam',
    '2016',
    "Stage Graphic",
    "*",
    [
		(PF_IMAGE, "image",       "Input image", None),
        (PF_DRAWABLE, "drawable", "Input drawable", None)
	],
    [],
	stage_graphic,
	menu="<Image>/Filters/Custom")

main()