在同一窗口中对Python3应用图像效果的方法

Question

所以问题是我不久前开始使用python而且我正在尝试使用一些代码。基本上我正在尝试创建一个包含图像的窗口，当按下某些按钮时，图像会发生变化（大小，模糊等等）。我遇到的一些问题是模糊只会生效一次，调整大小效果在较大/较小的一个上方创建另一个图像，而后一个图像不被删除。有没有办法让这一切发挥作用？先感谢您。我可能使用了太多的代码行，我完全清楚它，因为我仍然没有足够的知识:)。

import tkinter
import cv2
import PIL.Image, PIL.ImageTk

def blur_image():
    print("Blur")
    global photo_blur
    global cv_img_blur

    cv_img_blur = cv2.blur(cv_img, (3, 3))
    photo_blur = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(cv_img_blur))
canvas.create_image(0, 0, image=photo_blur, anchor=tkinter.NW)

def reduce_image():
    print("Reduced")
    global photo_reduce
    global cv_img_reduce

cv_img_reduce = cv2.resize(cv_img, (0,0), fx=0.5, fy=0.5, interpolation=cv2.INTER_AREA)
photo_reduce = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(cv_img_reduce))
canvas.create_image(0, 0, image=photo_reduce, anchor=tkinter.NW)

window = tkinter.Tk()
window.title("Project")

cv_img = cv2.cvtColor(cv2.imread("hqdefault.jpg"), cv2.COLOR_BGR2RGB)

height, width, no_channels = cv_img.shape

canvas = tkinter.Canvas(window, width = width, height = height)
canvas.pack()

photo = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(cv_img))

canvas.create_image(0, 0, image=photo, anchor=tkinter.NW)

btn_blur=tkinter.Button(window, text="Blur", width=50, command=blur_image)
btn_blur.pack(anchor=tkinter.CENTER, expand=True)

btn_reduce=tkinter.Button(window, text="Reduce", width=50, command=reduce_image)
btn_reduce.pack(anchor=tkinter.CENTER, expand=True)

window.mainloop()

Answer 1

尝试这样的事情

import tkinter
import cv2
import PIL.Image, PIL.ImageTk

blur_status = (3, 3)

def blur_image():

    print("Blur")
    global photo_blur, cv_img_blur, image, blur_status

    cv_img_blur = cv2.blur(cv_img, blur_status)
    photo_blur = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(cv_img_blur))
    canvas.delete(image)
    image = canvas.create_image(0, 0, image=photo_blur, anchor=tkinter.NW)

    n1, n2 = blur_status
    blur_status = (n1 + 1, n2 + 2)


def reduce_image():

    print("Reduced")
    global photo_reduce, cv_img_reduce, image

    cv_img_reduce = cv2.resize(cv_img, (0,0), fx=0.5, fy=0.5, interpolation=cv2.INTER_AREA)
    photo_reduce = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(cv_img_reduce))
    canvas.delete(image)
    image = canvas.create_image(0, 0, image=photo_reduce, anchor=tkinter.NW)


window = tkinter.Tk()
window.title("Project")

cv_img = cv2.cvtColor(cv2.imread("home.png"), cv2.COLOR_BGR2RGB)

height, width, no_channels = cv_img.shape

canvas = tkinter.Canvas(window, width = width, height = height)
canvas.pack()

photo = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(cv_img))

image = canvas.create_image(0, 0, image=photo, anchor=tkinter.NW)

btn_blur = tkinter.Button(window, text="Blur", width=50, command=blur_image)
btn_blur.pack(anchor=tkinter.CENTER, expand=True)

btn_reduce = tkinter.Button(window, text="Reduce", width=50, command=reduce_image)
btn_reduce.pack(anchor=tkinter.CENTER, expand=True)

window.mainloop()

实际上，您调用的函数会叠加图像，因为它们始终创建新图像而不修改先前创建的图像，因此在创建新图像之前，您必须删除旧图像。模糊似乎只是第一次起作用，因为值总是设置为（3,3），因为它们总是设置为（3,3），如果你想“多次工作”，你必须在每次调用函数时增加值