任何人都可以帮我使用 ImageTk 调整图像大小吗?
我有一块画布,我会把照片放在那里。
我有不同种类的图片=所有图片的尺寸不同
当我将图片(仅一张)附加到画布中时,我希望调整图片的大小,以便它适合画布并且仍保持其比例。
请帮助我!我是 PIL、Tkinter 和 Python 的新手。
更新:
我尝试在
thumbnail
下使用Image
,但在调整大小时:
self.image.thumbnail(self.picsize,Image.ANTIALIAS)
图像不适合画布尺寸,如果图像比画布长/宽,则仅将其剪切。 (不调整大小以适合画布)
代码:
from PIL import ImageTk
from Tkinter import *
import os,tkFileDialog,Image
picsize = 250,250 # I want to set this so that it will fit in the self.imagecanvas | Every images attached will share same Size
imagepath = "Default_ProPic.jpg"
class GUI():
global picsize
def display(self):
self.canvas = Canvas(width=1200,height=700)
self.canvas.pack()
self.imagecanvas = Canvas(self.canvas,width=400,height=400)
self.imagecanvas.place(x=980,y=180)
self.image = Image.open(imagepath)
self.image.thumbnail(picsize,Image.ANTIALIAS)
self.newimage = ImageTk.PhotoImage(self.image)
self.profile_picture=self.imagecanvas.create_image(0,0,anchor = NW,image=self.newimage)
attachbutton = Button(self.canvas,text=" Profile Pic ",command=lambda:self.attachpic())
attachbutton.place(x=1030,y=320)
mainloop()
def attachpic(self):
global picsize
attachphoto = tkFileDialog.askopenfilename(title="Attach photo")
self.image = Image.open(attachphoto)
self.image.thumbnail(picsize,Image.ANTIALIAS)
self.newimage = ImageTk.PhotoImage(self.image)
self.imagecanvas.itemconfigure(self.profile_picture, image=self.newimage)
GUI = GUI()
GUI.display()
上面使用的图片:
尝试将缩略图保存为单独的变量:
self.thmb_img = self.image.thumbnail(picsize, Image.ANTIALIAS)
我怀疑它可能会拿走原版
self.image = Image.open(attachphoto)
我建议观察尺码情况:
def attachpic(self):
picsize = 250, 250
attachphoto = tkFileDialog.askopenfilename(title="Attach photo")
self.image = Image.open(attachphoto)
print self.image.size()
self.thmb_img = self.image.thumbnail(picsize,Image.ANTIALIAS)
print self.thmb_img.size()
检查输出尺寸并验证其与原始尺寸和所需的 (250, 250) 缩略图相同。
您需要做的就是弄清楚应该调整到的尺寸
幸运的是,这并不难做到。
def best_fit(oldsize, picsize):
new_width, new_height = picsize
old_width, old_height = oldsize
# if new_width/old_width < new_height/old_height is mathematically the same as
if new_width * old_height < new_height * old_width:
# reduce height to keep original aspect ratio
new_height = max(1, old_height * new_width // old_width)
else:
# reduce width to keep original aspect ratio
new_width = max(1, old_width * new_height // old_height)
return (new_width, new_height)
siz = self.image.size
self.image = self.image.resize(best_fit(siz, picsize), Image.ANTIALIAS)
max
调用可防止宽度和高度为零。