gimp_scale_stroke_batch.py

#!/usr/bin/python

# copy and paste into GIMP Python Console
# scales, sharpens, strokes, and exports all open images as PNGs
# optimized for processing screen grabs
# Filters > Python-Fu > Console
# pip install importlib

import importlib

#gimpfu_path = '/Applications/Gimp-2.10/Contents/Resources/lib/gimp/2.0/python/gimpfu.py'
##gimpfu_path = '/Applications/GIMP.app/Contents/Resources/lib/gimp/2.0/python/gimpfu.py'
#gimpfu = importlib.load_source('module.name', gimpfu_path)


# Scale screen-grab and add border
def stroke_image(image, brush_size):
    width = image.width
    height = image.height
    brush_diameter = brush_size
    pdb.gimp_context_set_brush("2. Hardness 050")
    pdb.gimp_context_set_brush_size(brush_diameter)
    pdb.gimp_context_set_foreground("#555555")
    drawable = pdb.gimp_image_active_drawable(image)
    pdb.gimp_image_select_rectangle(image, 0, 0, 0, (width - 1), (height - 1))
    pdb.gimp_edit_stroke(drawable)


def scale_image(image, scale):
    width = image.width
    height = image.height
    scale = 1.0 / scale  # 1.0/.50 = 2 or 50%
    drawable = pdb.gimp_image_active_drawable(image)
    pdb.gimp_context_set_interpolation(INTERPOLATION_CUBIC)
    pdb.gimp_image_scale(image, width / scale, height / scale)
    pdb.plug_in_unsharp_mask(image, drawable, 1.0, 0.25, 0)
    pdb.gimp_context_set_background("#ffffff")
    pdb.gimp_image_flatten(image)


def export_png_file(image, compression):
    drawable = pdb.gimp_image_active_drawable(image)
    # pdb.file_png_save2(image, drawable, image, image, 
    #    interlace, compression, bkgd, gama, offs, phys, time, comment, svtrans)
    pdb.file_png_save2(image, drawable, image.uri.strip('file:\\\\'),
                       image.name, 0, compression, 0, 0, 0, 0, 0, 0, 0)


def process_images(scale, brush_size, compression):
    images = gimp.image_list()
    for image in images: # all open files
        print image.uri
        scale_image(image, scale)  # scale
        stroke_image(image, brush_size) # brush size
        export_png_file(image, compression) # compression


process_images(.33, 2, 7)