# Define background graphic object parameters
BKG_BRIGHTNESS = 0.5   # Initial brightness level
BKG_GAMMA = 0.8  # Works nicely for brightness = 0.2
BKG_IMAGE_FILE = "images/Astral_Fruit_192x128.bmp"

# Load the background image and source color palette
bkg_bitmap, bkg_palette_source = adafruit_imageload.load(
    BKG_IMAGE_FILE, bitmap=displayio.Bitmap, palette=displayio.Palette
)
# Instantiate background PaletteFader object and display on-screen
faded_object = PaletteFader(bkg_palette_source,
                            brightness=BKG_BRIGHTNESS,
                            gamma=BKG_GAMMA,
                            normalize=True)
bkg_tile = displayio.TileGrid(bkg_bitmap, pixel_shader=faded_object.palette)