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Django tends to fill up horizontal space when adding or editing entries on the admin, but, in some cases, is a real waste of space, when, i.e., editing a date field, 8 characters wide, or a CharField, also 6 or 8 chars wide, and then the edit box goes up to 15 or 20 chars.
How can I tell the admin how wide a textbox should be, or the height of a TextField edit box?
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Resize fields in Django Admin resize: Questions
How do I resize an image using PIL and maintain its aspect ratio?
5 answers
Is there an obvious way to do this that I"m missing? I"m just trying to make thumbnails.
Answer #1
Define a maximum size.
Then, compute a resize ratio by taking min(maxwidth/width, maxheight/height).
The proper size is oldsize*ratio.
There is of course also a library method to do this: the method Image.thumbnail.
Below is an (edited) example from the PIL documentation.
import os, sys
import Image
size = 128, 128
for infile in sys.argv[1:]:
outfile = os.path.splitext(infile)[0] + ".thumbnail"
if infile != outfile:
try:
im = Image.open(infile)
im.thumbnail(size, Image.ANTIALIAS)
im.save(outfile, "JPEG")
except IOError:
print "cannot create thumbnail for "%s"" % infile
Answer #2
This script will resize an image (somepic.jpg) using PIL (Python Imaging Library) to a width of 300 pixels and a height proportional to the new width. It does this by determining what percentage 300 pixels is of the original width (img.size[0]) and then multiplying the original height (img.size[1]) by that percentage. Change "basewidth" to any other number to change the default width of your images.
from PIL import Image
basewidth = 300
img = Image.open("somepic.jpg")
wpercent = (basewidth/float(img.size[0]))
hsize = int((float(img.size[1])*float(wpercent)))
img = img.resize((basewidth,hsize), Image.ANTIALIAS)
img.save("somepic.jpg")
Resize fields in Django Admin resize: Questions
How to resize an image with OpenCV2.0 and Python2.6
5 answers
I want to use OpenCV2.0 and Python2.6 to show resized images. I used and adopted this example but unfortunately, this code is for OpenCV2.1 and does not seem to be working on 2.0. Here my code:
import os, glob
import cv
ulpath = "exampleshq/"
for infile in glob.glob( os.path.join(ulpath, "*.jpg") ):
im = cv.LoadImage(infile)
thumbnail = cv.CreateMat(im.rows/10, im.cols/10, cv.CV_8UC3)
cv.Resize(im, thumbnail)
cv.NamedWindow(infile)
cv.ShowImage(infile, thumbnail)
cv.WaitKey(0)
cv.DestroyWindow(name)
Since I cannot use
cv.LoadImageM
I used
cv.LoadImage
instead, which was no problem in other applications. Nevertheless, cv.iplimage has no attribute rows, cols or size. Can anyone give me a hint, how to solve this problem?
Answer #1
If you wish to use CV2, you need to use the resize function.
For example, this will resize both axes by half:
small = cv2.resize(image, (0,0), fx=0.5, fy=0.5)
and this will resize the image to have 100 cols (width) and 50 rows (height):
resized_image = cv2.resize(image, (100, 50))
Another option is to use scipy module, by using:
small = scipy.misc.imresize(image, 0.5)
There are obviously more options you can read in the documentation of those functions (cv2.resize, scipy.misc.imresize).
Update:
According to the SciPy documentation:
imresizeis deprecated in SciPy 1.0.0, and will be removed in 1.2.0.
Useskimage.transform.resizeinstead.
Note that if you"re looking to resize by a factor, you may actually want skimage.transform.rescale.
We hope this article has helped you to resolve the problem. Apart from Resize fields in Django Admin, check other resize-related topics.
Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.
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New York | 2022-12-01
I was preparing for my coding interview, thanks for clarifying this - Resize fields in Django Admin in Python is not the simplest one. I am just not quite sure it is the best method
Vigrinia | 2022-12-01
Thanks for explaining! I was stuck with Resize fields in Django Admin for some hours, finally got it done 🤗. Checked yesterday, it works!
San Francisco | 2022-12-01
StackOverflow is always a bit confusing 😭 Resize fields in Django Admin is not the only problem I encountered. Will get back tomorrow with feedback
