Whitlisting file inputs

[Ofnuts]

Just skip files with a extension which isn't PNG, something like:

Code:

filename,fileext = os.path.splitext(element) # replaces a line of yours
if fileext[1:].upper() != 'PNG':
   continue

You can also more directly get the files you need:

Code:

import glob
files=glob.glob(os.path.join(file_inpath,'*.png')  # elements have their full paths

Unless I'm mistaken the file_mask is always the same, so this will always yield the same result:

Code:

# Add mask to new layer over image
layer_mask = pdb.gimp_file_load_layer(image,file_mask)
pdb.gimp_image_insert_layer(image,layer_mask,None,0)

# Mask layer alpha to selection
pdb.gimp_image_select_item(image,2,pdb.gimp_image_get_active_layer(image))
pdb.gimp_image_remove_layer(image,layer_mask)

# Invert Selection
pdb.gimp_selection_invert(image)

# Crop to selection
dimensions = pdb.gimp_selection_bounds(image)

So you can do it once for all, opening the mask as a separate image, that you discard once you have the values.