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(備忘録)[Python + tkinter] tk.PhotoImage でエラーが出る

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備忘録。
下記ソースのtk.PhotoImageで画像を読み込む際、
image "pyimage2" doesn't exist
というエラーが出た。
読み込む画像の枚数によっては"pyimage3"とかになるみたい。

wrong.py
import tkinter as tk
import tkinter.ttk as ttk
from tkinter import PhotoImage

root = tk.Tk()
root.title(u"TITLE")

img = "img.png"
img1 = tk.PhotoImage(file=img)        #ここ
label1 = ttk.Label(root,image=img1)
label1.grid(row=0,column=0)

root.mainloop()

調べた結果、tk.PhotoImageの引数としてmasterを指定する必要があって、その画像を表示するwidgetが格納される、rootなりframeなりを master=root のように明示すると解決した。

NG: img1 = tk.PhotoImage(file=img)
OK: img1 = tk.PhotoImage(file=img,master=root)

collect.py
import tkinter as tk
import tkinter.ttk as ttk
from tkinter import PhotoImage

root = tk.Tk()
root.title(u"TITLE")

img = "img.png"
img1 = tk.PhotoImage(file=img,master=root) #ここ
label1 = ttk.Label(root,image=img1)
label1.grid(row=0,column=0)

root.mainloop()
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