如何使用 python tkinter canvas 获得更好质量的图像？

Question

In the python tkinter library, I am trying to make a simple program that is supposed to allow you to take a screenshot and then blur out certain details. However the quality of the final image does not look desirable. it's all pixelated

Also, if you are wondering how to blur out parts of your image, all you got to do is click around.

I also do plan on making threading for saving of images, since there is freezing of the entire graphical user interface.

from tkinter import *
import pyautogui
import threading
import keyboard
import time
from PIL import ImageTk, Image, EpsImagePlugin

class screenshotwindow:
    def __init__(self, master):
        self.master = master
        self.screenshot = None
        self.cords = [None,None]
        self.clicks = 0
        self.master.focus_force()
        self.buttons()
        self.blurtwindow()
    def buttons(self):
        self.clear = Button(master=self.master, command=self.clear, text="Clear all blurring rectangles.")
        self.imgsave = Button(master=self.master, command=self.save, text="Save")
        self.clear.pack(side=BOTTOM)
        self.imgsave.pack(side=BOTTOM)
    def save(self):
        self.canv.postscript(file="test.jpg")
        EpsImagePlugin.gs_windows_binary = r"C:\Program Files\gs\gs9.53.3\bin\gswin64c"
        img = Image.open("test.jpg")
        img.format = "PNG"
        resize = img.resize((int(self.screenshot.size[0] * 1.3),int(self.screenshot.size[1] * 1.3)), Image.LANCZOS)
        resize.save("test.png", "png")
    def clear(self):
        self.canv.delete("all")
        self.canv.create_image(0, 0, image=self.image, anchor=NW)
    def cord(self,event):
        self.clicks += 1
        if self.clicks == 1:
            self.cords[0] = (event.x, event.y)
        if self.clicks == 2:
            self.clicks = 0
            self.cords[1] = (event.x, event.y)
            self.t = self.canv.create_rectangle(self.cords[0][0],self.cords[0][1], self.cords[1][0], self.cords[1][1], fill="black")
    def blurtwindow(self):
        self.screenshot = pyautogui.screenshot()
        self.screenshot.save("screenshot.png")
        self.canv = Canvas(self.master, width=(int(self.screenshot.size[0] / 1.3)), height=int((self.screenshot.size[1] / 1.3)), bg="white")
        self.canv.pack(fill=BOTH)
        self.resized_image = self.screenshot.resize((int(self.screenshot.size[0] / 1.3),int(self.screenshot.size[1] / 1.3)), Image.LANCZOS)
        self.image = ImageTk.PhotoImage(master=self.canv, image=self.resized_image)
        self.canv.create_image(0,0,image=self.image,anchor=NW)
        self.canv.bind("<Button-1>", self.cord)

root = Tk()
screenshotwindow(root)
root2.mainloop()

Answer 1

As I understand it you are doing the following:

1. Take a screenshot
2. resize the photo for Tk interface.
3. determine blurring
4. combine blurring with photo
5. repeat

It appears you are iteratively degrading the quality by using screenshots. You would probably get better performance by making a specific modification to the original image file instead of constantly processing the image through a screenshot/resize.