Comment vérifier les dimensions de toutes les images dans un répertoire à l'aide de python?

Si vous n'avez pas besoin du reste de la LIP et veulent juste les dimensions de l'image de PNG, JPEG et GIF alors cette petite fonction (licence BSD) ne fera très bien l'affaire:

http://code.google.com/p/bfg-pages/source/browse/trunk/pages/getimageinfo.py

import StringIO
import struct
def getImageInfo(data):
data = str(data)
size = len(data)
height = -1
width = -1
content_type = ''
# handle GIFs
if (size >= 10) and data[:6] in ('GIF87a', 'GIF89a'):
# Check to see if content_type is correct
content_type = 'image/gif'
w, h = struct.unpack("<HH", data[6:10])
width = int(w)
height = int(h)
# See PNG 2. Edition spec (http://www.w3.org/TR/PNG/)
# Bytes 0-7 are below, 4-byte chunk length, then 'IHDR'
# and finally the 4-byte width, height
elif ((size >= 24) and data.startswith('\211PNG\r\n\032\n')
and (data[12:16] == 'IHDR')):
content_type = 'image/png'
w, h = struct.unpack(">LL", data[16:24])
width = int(w)
height = int(h)
# Maybe this is for an older PNG version.
elif (size >= 16) and data.startswith('\211PNG\r\n\032\n'):
# Check to see if we have the right content type
content_type = 'image/png'
w, h = struct.unpack(">LL", data[8:16])
width = int(w)
height = int(h)
# handle JPEGs
elif (size >= 2) and data.startswith('\377\330'):
content_type = 'image/jpeg'
jpeg = StringIO.StringIO(data)
jpeg.read(2)
b = jpeg.read(1)
try:
while (b and ord(b) != 0xDA):
while (ord(b) != 0xFF): b = jpeg.read(1)
while (ord(b) == 0xFF): b = jpeg.read(1)
if (ord(b) >= 0xC0 and ord(b) <= 0xC3):
jpeg.read(3)
h, w = struct.unpack(">HH", jpeg.read(4))
break
else:
jpeg.read(int(struct.unpack(">H", jpeg.read(2))[0])-2)
b = jpeg.read(1)
width = int(w)
height = int(h)
except struct.error:
pass
except ValueError:
pass
return content_type, width, height

Voici un script qui fait ce que vous avez besoin de:

#!/usr/bin/env python
"""
Get information about images in a folder.
"""
from os import listdir
from os.path import isfile, join
from PIL import Image
def print_data(data):
"""
Parameters
----------
data : dict
"""
for k, v in data.items():
print("%s:\t%s" % (k, v))
print("Min width: %i" % data['min_width'])
print("Max width: %i" % data['max_width'])
print("Min height: %i" % data['min_height'])
print("Max height: %i" % data['max_height'])
def main(path):
"""
Parameters
----------
path : str
Path where to look for image files.
"""
onlyfiles = [f for f in listdir(path) if isfile(join(path, f))]
# Filter files by extension
onlyfiles = [f for f in onlyfiles if f.endswith('.jpg')]
data = {}
data['images_count'] = len(onlyfiles)
data['min_width'] = 10**100  # No image will be bigger than that
data['max_width'] = 0
data['min_height'] = 10**100  # No image will be bigger than that
data['max_height'] = 0
for filename in onlyfiles:
im = Image.open(filename)
width, height = im.size
data['min_width'] = min(width, data['min_width'])
data['max_width'] = max(width, data['max_height'])
data['min_height'] = min(height, data['min_height'])
data['max_height'] = max(height, data['max_height'])
print_data(data)
if __name__ == '__main__':
main(path='.')

Je suis à peu près satisfait des réponses fournies ci-dessus que ceux qui m'ont aidé à écrire une réponse simple à cette question.

Comme la réponse ci-dessus ont uniquement des scripts afin que les lecteurs ont besoin pour exécuter pour vérifier ces si ils fonctionne bien ou non. J'ai donc décidé de résoudre le problème en utilisant un mode interactif de programmation(à partir de Python shell).

Je pense que ce sera clair pour vous. Je suis à l'aide de Python 2.7.12 et j'ai installé Oreiller bibliothèque à utiliser PIL pour accéder aux images.J'ai beaucoup de jpg mages et 1 image png dans mon répertoire courant.

Maintenant, nous allons passer à Python shell.

>>> #Date of creation : 3 March 2017
>>> #Python version   : 2.7.12
>>>
>>> import os         #Importing os module
>>> import glob       #Importing glob module to list the same type of image files like jpg/png(here)
>>> 
>>> for extension in ["jpg", 'png']:
...     print "List of all "+extension+" files in current directory:-"
...     i = 1
...     for imgfile in glob.glob("*."+extension):
...         print i,") ",imgfile
...         i += 1
...     print "\n"
... 
List of all jpg files in current directory:-
1 )  002-tower-babel.jpg
2 )  1454906.jpg
3 )  69151278-great-hd-wallpapers.jpg
4 )  amazing-ancient-wallpaper.jpg
5 )  Ancient-Rome.jpg
6 )  babel_full.jpg
7 )  Cuba-is-wonderfull.jpg
8 )  Cute-Polar-Bear-Images-07775.jpg
9 )  Cute-Polar-Bear-Widescreen-Wallpapers-07781.jpg
10 )  Hard-work-without-a-lh.jpg
11 )  jpeg422jfif.jpg
12 )  moscow-park.jpg
13 )  moscow_city_night_winter_58404_1920x1080.jpg
14 )  Photo1569.jpg
15 )  Pineapple-HD-Photos-03691.jpg
16 )  Roman_forum_cropped.jpg
17 )  socrates.jpg
18 )  socrates_statement1.jpg
19 )  steve-jobs.jpg
20 )  The_Great_Wall_of_China_at_Jinshanling-edit.jpg
21 )  torenvanbabel_grt.jpg
22 )  tower_of_babel4.jpg
23 )  valckenborch_babel_1595_grt.jpg
24 )  Wall-of-China-17.jpg
List of all png files in current directory:-
1 )  gergo-hungary.png
>>> #So let's display all the resolutions with the filename
... from PIL import Image   #Importing Python Imaging library(PIL)
>>> for extension in ["jpg", 'png']:
...     i = 1
...     for imgfile in glob.glob("*."+extension):
...         img = Image.open(imgfile)
...         print i,") ",imgfile,", resolution: ",img.size[0],"x",img.size[1]
...         i += 1
...     print "\n"
... 
1 )  002-tower-babel.jpg , resolution:  1024 x 768
2 )  1454906.jpg , resolution:  1920 x 1080
3 )  69151278-great-hd-wallpapers.jpg , resolution:  5120 x 2880
4 )  amazing-ancient-wallpaper.jpg , resolution:  1920 x 1080
5 )  Ancient-Rome.jpg , resolution:  1000 x 667
6 )  babel_full.jpg , resolution:  1464 x 1142
7 )  Cuba-is-wonderfull.jpg , resolution:  1366 x 768
8 )  Cute-Polar-Bear-Images-07775.jpg , resolution:  1600 x 1067
9 )  Cute-Polar-Bear-Widescreen-Wallpapers-07781.jpg , resolution:  2300 x 1610
10 )  Hard-work-without-a-lh.jpg , resolution:  650 x 346
11 )  jpeg422jfif.jpg , resolution:  2048 x 1536
12 )  moscow-park.jpg , resolution:  1920 x 1200
13 )  moscow_city_night_winter_58404_1920x1080.jpg , resolution:  1920 x 1080
14 )  Photo1569.jpg , resolution:  480 x 640
15 )  Pineapple-HD-Photos-03691.jpg , resolution:  2365 x 1774
16 )  Roman_forum_cropped.jpg , resolution:  4420 x 1572
17 )  socrates.jpg , resolution:  852 x 480
18 )  socrates_statement1.jpg , resolution:  1280 x 720
19 )  steve-jobs.jpg , resolution:  1920 x 1080
20 )  The_Great_Wall_of_China_at_Jinshanling-edit.jpg , resolution:  4288 x 2848
21 )  torenvanbabel_grt.jpg , resolution:  1100 x 805
22 )  tower_of_babel4.jpg , resolution:  1707 x 956
23 )  valckenborch_babel_1595_grt.jpg , resolution:  1100 x 748
24 )  Wall-of-China-17.jpg , resolution:  1920 x 1200
1 )  gergo-hungary.png , resolution:  1236 x 928
>>>