我尝试过多种方式使用tkinter显示大图像really long image无论我尝试过什么，似乎没有任何代码可行。主要问题是Canvas的最大高度限制大约为30,000像素。
有没有办法显示整个图像？增加，或绕过画布限制？请参阅下面的示例图片。
答案 0 :(得分：0)
除了修改和重新编译底层tk代码之外，没有办法绕过画布的大小限制。这可能不是一项微不足道的任务。
假设您尝试在典型的计算机屏幕上显示图像，仍有方法可以查看图像。基本上它归结为仅加载用户可以在任何时间看到的图像部分。
例如，世界的图像比64k大64k，但谷歌地图可以让你滚动所有你想要的。它通过将地图显示为一系列图块来实现此目的。当您在图像中移动时，会抛弃屏幕外的图块并加载新图块。
这种技术可以在tkinter中使用，甚至可以与滚动条一起使用而不是拖动动作。您只需将滚动条挂钩到函数而不是直接挂接到画布。然后，当调用该函数时，它可以计算用户正在查看的图像的哪个部分，并将其加载到内存中。
答案 1 :(得分：0)
这是一个相当缺乏吸引力的答案，但答案却非常少。这将极长的图像划分为＆＃34; tiles＆＃34; 1000像素长度。它没有划分宽度。我已经将来自多个来源的代码拼接在一起，直到我完成所有工作。如果有人可以通过滚动条功能实现这一点，那就太酷了。
from tkinter import *
from PIL import ImageTk as itk
from PIL import Image
import math
import numpy as np
Image.MAX_IMAGE_PIXELS = None #prevents the "photo bomb" warning from popping up. Have to have this for really large images.
#----------------------------------------------------------------------
# makes a simple window with a button right in the middle that let's you go "down" an image.
class MainWindow():
#----------------
def __init__(self, main):
# canvas for image
_, th, tw, rows, cols = self.getrowsandcols()
self.canvas = Canvas(main, width=tw, height=th)
#self.canvas.grid(row=0, column=0)
self.canvas.pack()
# images
self.my_images = self.cropimages() # crop the really large image down into several smaller images and append to this list
self.my_image_number = 0 #
# set first image on canvas
self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])
# button to change image
self.upbutton = Button(main, text="UP", command=self.onUpButton)
self.downbutton = Button(main, text="DOWN", command=self.onDownButton)
self.upbutton.pack()
self.downbutton.pack()
#self.downbutton.grid(row=1, column=0)
#self.upbutton.grid(row=1, column=0)
#----------------
def getimage(self):
im = Image.open("Test_3.png") # import the image
im = im.convert("RGBA") # convert the image to color including the alpha channel (which is the transparency best I understand)
width, height = im.size # get the width and height
return width, height, im # return relevent variables/objects
def getrowsandcols(self):
width, height, im = self.getimage()
im = np.asarray(im) # Convert image to Numpy Array
tw = width # Tile width will equal the width of the image
th = int(math.ceil(height / 100)) # Tile height
rows = int(math.ceil(height / th)) # Number of tiles/row
cols = int(math.ceil(width / tw)) # Number of tiles/column
return im, th, tw, rows, cols #return selected variables
def cropimages(self):
self.my_images = [] # initialize list to hold Tkinter "PhotoImage objects"
im, th, tw, rows, cols = self.getrowsandcols() # pull in needed variables to crop the really long image
for r in range(rows): # loop row by row to crop all of the image
crop_im =im[r * th:((r * th) + th), 0:tw] # crop the image for the current row (r). (th) stands for tile height.
crop_im = Image.fromarray(crop_im) # convert the image from an Numpy Array to a PIL image.
crop_im = itk.PhotoImage(crop_im) # convert the PIL image to a Tkinter Photo Object (whatever that is)
self.my_images.append(crop_im) # Append the photo object to the list
crop_im = None
return self.my_images
def onUpButton(self):
# next image
if self.my_image_number == 0:
self.my_image_number = len(self.my_images)-1
else:
self.my_image_number -= 1 # every button pressed will
# change image
self.canvas.itemconfig(self.image_on_canvas, image=self.my_images[self.my_image_number]) # attaches the image from the image list to the canvas
def onDownButton(self):
# next image
self.my_image_number += 1 #every button pressed will
# return to first image
if self.my_image_number == len(self.my_images):
self.my_image_number = 0
# change image
self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number]) #attaches the image from the image list to the canvas
#----------------------------------------------------------------------
root = Tk()
MainWindow(root)
root.mainloop()