python - 如何为Python中的imagegrab库中的区域选择提供动态值

Question

使用此脚本，我尝试截取特定区域桌面的屏幕截图。(使用 Tkinter gui)

但是使用这段代码我只能截取桌面修复区域(框架)的屏幕截图。所以我想做的是尝试将(imagegrab的bbox)的值设置为动态。

动态我的意思是它应该只捕获由我的鼠标光标在屏幕上任何位置选择(突出显示)的屏幕区域，并且可以是任何大小。

import tkinter as tk
from tkinter import *
from PIL import Image, ImageGrab 
root = tk.Tk()
def area_sel():    
     # using the grab method 
     img = ImageGrab.grab(bbox = (400,500,400,500)) #i want these values to be dynamic
     img.show() 

sel_btn = tk.Button(root, text='select area', width=20, command=area_sel)
sel_btn.pack()

root.mainloop()

示例图像

here is what i am trying to do is to take coordinates from your code and then recording that particular area of screen.

def recording_screen():

    global recording
    recording = True

    while recording:
        sel=area_sel()    
        img = ImageGrab.grab(bbox=(Click_x, Click_y, Release_x, Release_y))
        frame = np.array(img)
        out.write(frame)

Answer 1

您可以使用 Pillow 来做您想做的事情:

import tkinter as tk
from PIL import Image, ImageTk, ImageGrab, ImageEnhance

root = tk.Tk()
root.resizable(0, 0)

def show_image(image):
    win = tk.Toplevel()
    win.image = ImageTk.PhotoImage(image)
    tk.Label(win, image=win.image).pack()
    win.grab_set()
    win.wait_window(win)

def area_sel():
    x1 = y1 = x2 = y2 = 0
    roi_image = None

    def on_mouse_down(event):
        nonlocal x1, y1
        x1, y1 = event.x, event.y
        canvas.create_rectangle(x1, y1, x1, y1, outline='red', tag='roi')

    def on_mouse_move(event):
        nonlocal roi_image, x2, y2
        x2, y2 = event.x, event.y
        canvas.delete('roi-image') # remove old overlay image
        roi_image = image.crop((x1, y1, x2, y2)) # get the image of selected region
        canvas.image = ImageTk.PhotoImage(roi_image)
        canvas.create_image(x1, y1, image=canvas.image, tag=('roi-image'), anchor='nw')
        canvas.coords('roi', x1, y1, x2, y2)
        # make sure the select rectangle is on top of the overlay image
        canvas.lift('roi') 

    root.withdraw()  # hide the root window
    image = ImageGrab.grab()  # grab the fullscreen as select region background
    bgimage = ImageEnhance.Brightness(image).enhance(0.3)  # darken the capture image
    # create a fullscreen window to perform the select region action
    win = tk.Toplevel()
    win.attributes('-fullscreen', 1)
    win.attributes('-topmost', 1)
    canvas = tk.Canvas(win, highlightthickness=0)
    canvas.pack(fill='both', expand=1)
    tkimage = ImageTk.PhotoImage(bgimage)
    canvas.create_image(0, 0, image=tkimage, anchor='nw', tag='images')
    # bind the mouse events for selecting region
    win.bind('<ButtonPress-1>', on_mouse_down)
    win.bind('<B1-Motion>', on_mouse_move)
    win.bind('<ButtonRelease-1>', lambda e: win.destroy())
    # use Esc key to abort the capture
    win.bind('<Escape>', lambda e: win.destroy())
    # make the capture window modal
    win.focus_force()
    win.grab_set()
    win.wait_window(win)
    root.deiconify()  # restore root window
    # show the capture image
    if roi_image:
        show_image(roi_image)

tk.Button(root, text='select area', width=30, command=area_sel).pack()

root.mainloop()

选择区域时:

选择区域后显示捕获图像: