[Python] How do I use the python support in DigitalMicrograph to save a color image as PNG file

I can use the python functionality to save a DM image into PNG, as long as it is NOT RGB data type. Here is the code for doing so:

import tkinter as tk
from tkinter import filedialog
from skimage import io, img_as_ubyte, img_as_uint
import numpy as np
import DigitalMicrograph as DM

# Hide the main window
root = tk.Tk()
root.withdraw()

# Get DM image
img = DM.GetFrontImage()
img_data = img.GetNumArray()

# Ask for save-path
save_path = filedialog.asksaveasfilename(
title='Save PNG image',
defaultextension='.png',
filetypes=[('PNG images', '*.png')],
)

if save_path:
try:
# Convert to uint8 (0–255) before saving
img_u8 = img_as_ubyte(img_data)
io.imsave(save_path, img_u8)
print(f'Image saved to: {save_path}')
except OSError as e:
print(f'Failed to save image: {e}')
else:
print('Save canceled by user.')


The script will fail if the front image is of RGB data type. I believe that the reason is the Py_image class does not support the GetNumArray() method. Is there a solution to this other than taking in 3 DM images (as red, green, blue channels)?

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