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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.
