python通过手指触摸爬取改变图片大小

要通过手指触摸改变图片大小，你需要使用一个图形界面库（例如Tkinter或PyQt）来创建一个窗口，然后在窗口中显示图片，并通过鼠标事件来控制图片大小。

以下是一个使用Tkinter的示例代码：

import tkinter as tk
from PIL import Image, ImageTk

class App:
    def __init__(self, master):
        self.master = master
        self.image = Image.open("image.jpg")
        self.photo = ImageTk.PhotoImage(self.image)
        self.canvas = tk.Canvas(self.master, width=self.image.width, height=self.image.height)
        self.canvas.create_image(0, 0, anchor=tk.NW, image=self.photo)
        self.canvas.pack()
        self.canvas.bind("<Button-1>", self.on_click)
        self.canvas.bind("<B1-Motion>", self.on_drag)
        self.canvas.bind("<ButtonRelease-1>", self.on_release)
        self.scale = 1.0
        self.start_x = None
        self.start_y = None

    def on_click(self, event):
        self.start_x = event.x
        self.start_y = event.y

    def on_drag(self, event):
        if self.start_x is not None and self.start_y is not None:
            delta_x = event.x - self.start_x
            delta_y = event.y - self.start_y
            self.scale += delta_y / 100.0
            if self.scale < 0.1:
                self.scale = 0.1
            elif self.scale > 10.0:
                self.scale = 10.0
            new_width = int(self.image.width * self.scale)
            new_height = int(self.image.height * self.scale)
            resized_image = self.image.resize((new_width, new_height))
            self.photo = ImageTk.PhotoImage(resized_image)
            self.canvas.delete("all")
            self.canvas.create_image(0, 0, anchor=tk.NW, image=self.photo)
            self.canvas.configure(width=new_width, height=new_height)

    def on_release(self, event):
        self.start_x = None
        self.start_y = None

root = tk.Tk()
app = App(root)
root.mainloop()

这个示例代码会在窗口中显示一张名为"image.jpg"的图片，并允许你通过鼠标拖动来改变图片大小。拖动过程中，会通过Pillow库来重新调整图片大小并更新界面。