我正在使用我在这里找到的代码：http: //svn.python.org/projects/python/branches/pep-0384/Demo/tkinter/ttk/roundframe.py它给了我圆角的框架。（这是Bryan Oakley相关文章的链接）。但是，我想为使用该样式生成的框架的背景着色。
"""Ttk Frame with rounded corners.
Based on an example by Bryan Oakley, found at: http://wiki.tcl.tk/20152"""
import tkinter
from tkinter import ttk
root = tkinter.Tk()
img1 = tkinter.PhotoImage("frameFocusBorder", data="""
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img2 = tkinter.PhotoImage("frameBorder", data="""
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style = ttk.Style()
style.element_create("RoundedFrame", "image", "frameBorder",
("focus", "frameFocusBorder"), border=16, sticky="nsew")
style.layout("RoundedFrame", [("RoundedFrame", {"sticky": "nsew"})])
style.configure("TEntry", borderwidth=0)
frame = ttk.Frame(style="RoundedFrame", padding=10)
frame.pack(fill='x')
frame2 = ttk.Frame(style="RoundedFrame", padding=10)
frame2.pack(fill='both', expand=1)
entry = ttk.Entry(frame, text='Test')
entry.pack(fill='x')
entry.bind("<FocusIn>", lambda evt: frame.state(["focus"]))
entry.bind("<FocusOut>", lambda evt: frame.state(["!focus"]))
text = tkinter.Text(frame2, borderwidth=0, bg="white", highlightthickness=0)
text.pack(fill='both', expand=1)
text.bind("<FocusIn>", lambda evt: frame2.state(["focus"]))
text.bind("<FocusOut>", lambda evt: frame2.state(["!focus"]))
root.mainloop()
在我看来，该文件的作用是将图像应用为样式表，而该图像是巨大的文本块。因此，当我尝试给样式本身或框架背景颜色时，Python 会返回我：_tkinter.TclError: unknown option "-bg".
我认为解决方案是更改图像。经过一番研究，我发现显然 PhotoImage 类将“base64 编码的 GIF 文件”作为字符串，现在，我该如何解码，或者，我将提供什么图像格式 PhotoImage 以便我可以适当地更改框架？