4. ImageDraw bitmap

See: https://pillow.readthedocs.io/en/stable/reference/ImageDraw.html#PIL.ImageDraw.ImageDraw.bitmap

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4.1. Bitmap

Use the ImageDraw.bitmap(xy, bitmap, fill=None) method to draw a bitmap (mask) at the given position, using the current fill color for the non-zero portions.

The bitmap should be a valid transparency mask (mode “1”) or matte (mode “L” or “RGBA”).

The fill color is used for the non-zero portions of the bitmap.

from PIL import Image, ImageDraw


with Image.open("test_images/greyscale_vert_gradient_32.png") as img1:
    with Image.open("test_images/rgb_colors.png") as img2:
        img1_bitmap = img1.convert("L")

        img2_drw = ImageDraw.Draw(img2)
        img2_drw.bitmap((0,0), img1_bitmap)
        # img2.show()
        img2.save("ImageDraw/ImageDraw_bitmap.png")

        img2_drw = ImageDraw.Draw(img2)
        img2_drw.bitmap((0,0), img1_bitmap, fill=(255,0,0))
        # img2.show()
        img2.save("ImageDraw/ImageDraw_bitmap_red.png")