I am attempting to load a .gif image into a canvas. Once loaded the picture is to be resized using the .scale method on the canvas. The image reloads but does not resize.
I am using python 3.6. I tried it in python 2.7 with the same result although on the full implementation rather that the simplified code shown below.
import tkinter as tk
f = "C:\Fanny Poer.gif"
root = tk.Tk()
dis = tk.Canvas(root)
dis.grid()
new_image = tk.PhotoImage(file=f)
id = dis.create_image(500, 500, image = new_image)
dis.scale(id, 0, 0, .1, .1)
root.mainloop()
The image loads but does not resize. What am I doing wrong?
Once loaded the picture is to be resized using the .scale method on the canvas.
You can't do that with the scale method. That method only affects the coordinates of an object. It won't resize an image.
To resize an image you can use the subsample and zoom methods on the PhotoImage instance, or you can use some other library (eg: pillow) to resize the image.
Related
I'm trying to open image files and display them in python 3.8 using Tkinter and Pillow, but something is scaling the images wrong on my screen.
import tkinter as tk
from PIL import Image, ImageTk
class ViewingWindow(tk.Frame):
def __init__(self, parent):
tk.Frame.__init__(self, parent)
self.image = None
self.canvas = tk.Canvas(self, width=500, height=500)
self.canvas.pack()
def setImage(self, img):
self.image = img
print(img.width())
print(img.height())
print(self.canvas["width"])
print(self.canvas["height"])
self.canvas.create_image(0, 0, anchor=tk.NW, image=img)
window = tk.Tk()
canvas = ViewingWindow(window)
canvas.pack()
img = Image.open("500x500.jpg")
img = ImageTk.PhotoImage(img)
canvas.setImage(img)
window.mainloop()
This is the result, shown for reference is Windows image viewer at "show actual size", and Gimp at scaling=100%:
The 4 print statements all show "500", every part of the system seems to agree that the image is shown at 500x500, except the actual pixels on the screen. For whatever reason it's scaled to something close to 750x750, what in the world is scaling my image? This is consistent for all images I've tried to open in Tkinter, and regardless on window size and widget sizes.
Tested on Windows 10 with screen resolution 1920x1080.
it's scaled to something close to 750x750
750/500 = 150%.It seems that your system zoom ratio is 150%.
To show the right image size.Just like furas said,you need to use DPI awareness.Read the problem in MSDN official doc
About DPI awareness.
To solve the problem,you can set the DPI awareness in your code.(Or you can change the zoom ratio to 100%)
In my PC,the are not the same size without DPI awareness.Now after set the DPI awareness:
Add this in your code:
import ctypes
ctypes.windll.shcore.SetProcessDpiAwareness(2) # this could only be used when your version of windows >= 8.1
So I have 2 images, 1 image is supposed to be the background and the other 1 is just an image of a character.
I am able to put one image over the other but the image has white borders even though it's a PNG file.
This is how it looks like:
This is how I want it to look like:
Here are the two separte images:
https://imgur.com/a/SmE5lgC
Sorry that I didnt post the images directly but I can not since I do no have 10 reputation points.
I've tried converting it to RGBA but same thing happened.
from tkinter import *
from PIL import Image
root = Tk()
root.title("Game")
background = PhotoImage(file="back.png")
backgroundlabel = Label(root, image=background)
backgroundlabel.pack()
character = PhotoImage(file="hero.png")
characterlabel = Label(root, image=character)
characterlabel.place(x=0,y=0)
root.mainloop()
You just need to use the canvas widget in Tkinter. Only the canvas widget supports transparency. This has to do with how Tkinter draws the display. As of right now, your code is just overlaying two images. Tkinter does not know how to compose them with transparency unless you use the canvas widget.
See the following code:
from tkinter import *
from PIL import Image
root = Tk()
root.title("Game")
frame = Frame(root)
frame.pack()
canvas = Canvas(frame, bg="black", width=700, height=400)
canvas.pack()
background = PhotoImage(file="background.png")
canvas.create_image(350,200,image=background)
character = PhotoImage(file="hero.png")
canvas.create_image(30,30,image=character)
root.mainloop()
All I did was download the images you provided. I did not modify the images. So, the bottom line is that you just need to use the canvas widget.
Voilà!
Note: The question asked is a duplicate of How do I make Tkinter support PNG transparency?
I am currently working on reading an image and displaying it to a window. I have successfully done this, but upon displaying the image, the window only allows me to see a portion of the
full image. I tried saving the image after loading it, and it saved the entire image. So I am fairly certain that it is reading the entire image.
imgFile = cv.imread('1.jpg')
cv.imshow('dst_rt', imgFile)
cv.waitKey(0)
cv.destroyAllWindows()
Image:
Screenshot:
Looks like the image is too big and the window simply doesn't fit the screen.
Create window with the cv2.WINDOW_NORMAL flag, it will make it scalable. Then you can resize it to fit your screen like this:
from __future__ import division
import cv2
img = cv2.imread('1.jpg')
screen_res = 1280, 720
scale_width = screen_res[0] / img.shape[1]
scale_height = screen_res[1] / img.shape[0]
scale = min(scale_width, scale_height)
window_width = int(img.shape[1] * scale)
window_height = int(img.shape[0] * scale)
cv2.namedWindow('dst_rt', cv2.WINDOW_NORMAL)
cv2.resizeWindow('dst_rt', window_width, window_height)
cv2.imshow('dst_rt', img)
cv2.waitKey(0)
cv2.destroyAllWindows()
According to the OpenCV documentation CV_WINDOW_KEEPRATIO flag should do the same, yet it doesn't and it's value not even presented in the python module.
This can help you
namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
imshow( "Display window", image ); // Show our image inside it.
In openCV whenever you try to display an oversized image or image bigger than your display resolution you get the cropped display. It's a default behaviour.
In order to view the image in the window of your choice openCV encourages to use named window. Please refer to namedWindow documentation
The function namedWindow creates a window that can be used as a placeholder for images and trackbars. Created windows are referred to by their names.
cv.namedWindow(name, flags=CV_WINDOW_AUTOSIZE)
where each window is related to image container by the name arg, make sure to use same name
eg:
import cv2
frame = cv2.imread('1.jpg')
cv2.namedWindow("Display 1")
cv2.resizeWindow("Display 1", 300, 300)
cv2.imshow("Display 1", frame)
So I want to put a .jpg in a canvas, all i found on internet is to use PIL but i'm using Python 3.2 so PIL doesn't work.
What can i do to insert a .jpg in a canvas with Python 3.2 ?
Just to save anyone else viewing this now from hunting around for the bits and pieces (like I just did)
As Martijn Pieters said use Pillow rather than PIL, but the code looks the same
from tkinter import Tk, Canvas
from PIL import ImageTk, Image
root = Tk()
#Create a canvas
canvas = Canvas(root, width=400, height=300)
canvas.pack()
# Load the image file
im = Image.open('test_image.jpg')
# Put the image into a canvas compatible class, and stick in an
# arbitrary variable to the garbage collector doesn't destroy it
canvas.image = ImageTk.PhotoImage(im)
# Add the image to the canvas, and set the anchor to the top left / north west corner
canvas.create_image(0, 0, image=canvas.image, anchor='nw')
root.mainloop()
PIL does work on Python 3.2; install Pillow, the friendly PIL fork.
Pillow 2.0.0 adds Python 3 support and includes many bug fixes from around the internet.
You just need to create the image in the canvas. Make sure that your image is in the same folder as your code.
image = PhotoImage (file="image.jpg")
yourcanvas.canvas.create_image (0, 0, anchor=NW, image=image, tags="bg_img")
That should do it. This will also extend the canvas to the size of the image, just to let you know. Good luck with your project!
I put in a partially transparent PNG image in Tkinter and all I get is this
How do I make the dark triangle on the right clear? (like it's supposed to be)
This is python 2.6 on Windows 7, btw.
Here's an example (the PNG file example.png has lots of transparency in different places):
from Tkinter import Tk, Frame, Canvas
import ImageTk
t = Tk()
t.title("Transparency")
frame = Frame(t)
frame.pack()
canvas = Canvas(frame, bg="black", width=500, height=500)
canvas.pack()
photoimage = ImageTk.PhotoImage(file="example.png")
canvas.create_image(150, 150, image=photoimage)
t.mainloop()
You need to make sure the image has been stored as "RGBA" which is RGB with an alpha channel. You can check for that using a graphics program of your choice, or using PIL (Python Imaging Library):
import Image
im = Image.open("button.png")
print im.mode
This should print "RGBA". If not, you'll have to make sure the alpha channel is saved with the image. You'll have to consult your graphics program manual for how to do that.