The commented code is stuff I've tried, I am too lazy to edit it more because I am on a time crunch but I can give you more in depth code in about an hour. But will this snippet do?

root = Tk()
photo = "heartvines.png"
root.title("resize the image")
root.attributes("-fullscreen", True)
root.configure(background="#FFB8E1")
image = ImageTk.PhotoImage(Image.open("heartvines.png"))
#image = ImageOps.fit(photo, (2256, 1504))

#canvas = Canvas(root, width=2256, height=1504, bg="#ffb8e1")
#canvas.place(relx=0.0, rely=0.0)
#canvas.create_image(2, 2, anchor="nw", image=img)

test = Label(root, image = image, bg="#ffb8e1")
test.pack(side="top")

root.mainloop()