Develop Reference

Converting all files (.jpg to .png) from a directory in Python

I'm trying to convert all files from a directory from .jpg to .png. The name should remain the same, just the format would change.
I've been doing some researches and came to this:
from PIL import Image
import os
directory = r'D:\PATH'
for filename in os.listdir(directory):
if filename.endswith(".jpg"):
im = Image.open(filename)
im.save('img11.png')
print(os.path.join(directory, filename))
continue
else:
continue
I was expecting the loop to go through all my .jpg files and convert them to .png files. So far I was doing only with 1 name: 'img11.png', I haven't succed to build something able to write the adequate names.
The print(os.path.join(directory, filename)) works, it prints all my files but concerning the converting part, it only works for 1 file.
Do you guys have any idea for helping me going through the process?

You can convert the opened image as RGB and then you can save it in any format.
You can try the following code :
from PIL import Image
import os
directory = r'D:\PATH'
c=1
for filename in os.listdir(directory):
if filename.endswith(".jpg"):
im = Image.open(filename)
name='img'+str(c)+'.png'
rgb_im = im.convert('RGB')
rgb_im.save(name)
c+=1
print(os.path.join(directory, filename))
continue
else:
continue

You're explicitly saving every file as img11.png.
You should get the name of your jpg file and then use that to name and save the png file.
name = filename[:-4]
im.save(name + '.png')

I would have used os.rename() function like below.
import os
directory = r'D:\PATH'
for filename in os.listdir(directory):
prefix = filename.split(".jpg")[0]
os.rename(filename, prefix+".png")
Please let me know if this is what you wanted. Try the code with some copied images inside a test folder, before applying to the intended folder. All the best.

from PIL import Image
import os
directory = r'D:\PATH'
for filename in os.listdir(directory):
if filename.endswith(".jpg"):
prefix = filename.split(".jpg")[0]
im = Image.open(filename)
im.save(prefix+'.png')
else:
continue
Please try this one and let me know.

How can I assignin filenames correctly while applying ImageFilters in Python

So I'm trying to use pillow to apply kernals to .jpg images in python and I'm trying to process an entire image set at once. I have a script here that will iterate through the training set, apply the edge finding filter, and save the result in a different folder. Whenever I try to do that using the .save command it throw an error telling me there is no such file as the one I'm saving it to. The thing is, I'm trying to create that file. It doesn't do this when I've got a definite file name, only when I'm trying to do it iterativly. Can anyone see what the problem here is?
import PIL
import os
from PIL import Image
from PIL import ImageFilter
from PIL.ImageFilter import (FIND_EDGES)
num = 1
path = "/home/<me>/Desktop/<my documents>/<my project>/Training Set Cars/"
dirs = os.listdir(path)
for filename in dirs:
print(filename)
im = Image.open(path + filename)
aString = str(num)
print("/home/<me>/Desktop/<my documents>/<my project>/Training Car Edges/%s.jpg" % aString)
ERROR HERE>>> im.filter(FIND_EDGES).save("/home/<me>/Desktop/<my documents>/<my project>/Training Car Edges/%s.jpg" % aString)
num += 1

generate gif with images2gif

I am generating a gif with images2gif from some .png pictures. I am using the following script:
__author__ = 'Robert'
from images2gif import writeGif
from PIL import Image
import os
file_names = sorted((fn for fn in os.listdir('/home/manager/Desktop/sf_linux_shared/project/prueba') if fn.endswith('.png')))
#['animationframa.png', 'animationframb.png', ...] "
images = [Image.open(fn) for fn in file_names]
size = (150,150)
for im in images:
im.thumbnail(size, Image.ANTIALIAS)
print writeGif.__doc__
filename = "my_gif.GIF"
writeGif(filename, images, duration=0.2)
however I have the following error:
IOError: [Errno 2] No such file or directory: 'cosa.png'
cosa.png is one of the pictures I want to create the gif with. The problem seems to be in:
images = [Image.open(fn) for fn in file_names]
but I cannot detect it

open(filename) looks in the current working directory if filename is not an
absolute path. The current working directory is the directory from which the script is run.
Either use os.chdir to change the working directory, or make all your filenames absolute:
WORKDIR = '/home/manager/Desktop/sf_linux_shared/project/prueba'
file_names = sorted((os.path.join(WORDIR, fn)
for fn in os.listdir(WORKDIR) if fn.endswith('.png')))

Python 3 - Deleting pictures from a folder that are under 1920x1080

I am using a subreddit scraper to download images from wallpaper subreddits. The problem I am having is that some images have a small resolution causing them to look awful when used as wallpapers. I have found that the minimum resolution needed for a good looking wallpaper is 1920x1080. I now need to make a constantly running script that scans the image folder, looks at each images resolution and decides whether to delete it or move on to the next image. I've been tinkering about in Python for an hour or so but feel I am going nowhere fast as I am only a beginner and have not used Python for a few months. Any help on this project would be awesome ;)! Cheers.
UPDATE: I am now stuck on how to get the program to run through a folder and look at each picture. Currently my code is;
import os
from PIL import Image
while True:
for file in os.listdir(r"C:\\Users\\Barney\\Documents\\sam"):
im = Image.open(file)
x, y = im.size
totalsize = x*y
if totalsize < 2073600:
os.remove(file)
But this returns the error;
Traceback (most recent call last):
File "C:\Users\Barney\Desktop\imagefilter.py", line 7, in <module>
im = Image.open(file)
File "C:\Python34\lib\site-packages\PIL\Image.py", line 2251, in open
fp = builtins.open(fp, "rb")
FileNotFoundError: [Errno 2] No such file or directory: 'Car - 1971 Ford Mustang Mach 1 351 [2560X1600].jpg'
Looking on the internet I see that there may be a problem from where I am opening the program?? Very confused as the program is looking into this folder and reading the contents as the file it says doesnt exist is in that folder? Any help?

You can use Pillow or PIL:
from PIL import Image
with Image.open(image_file_path) as im:
x, y = im.size
if x < 1920 or y < 1080:
....
UPDATE
os.listdir returns a list of filenames, not a list of filepaths. Unless you run the program in the image directory, it cannot open the file.
Run your program in the image directory, or convert the filenames to filepaths so they can be accessed.
import os
from PIL import Image
img_dir = r"C:\Users\Barney\Documents\sam"
for filename in os.listdir(img_dir):
filepath = os.path.join(img_dir, filename)
with Image.open(filepath) as im:
x, y = im.size
totalsize = x*y
if totalsize < 2073600:
os.remove(filepath)

If you have many subfolders under a main folder you can use the following code:
[for directory_path in glob.glob(r'F:\Data\Main_folder\*'):
print(directory_path)
for filename in os.listdir(directory_path):
filepath = os.path.join(directory_path, filename)
print(filepath)
with Image.open(filepath) as im:
x, y = im.size
totalsize = x*y
if totalsize < 50176:
os.remove(filepath)][1]

How can I use a variable instead of a path to open an image file using PIL in Python?

I'm trying to create a simple script to pull EXIF information out from multiple jpeg files at once, but I'm getting "IOError: cannot identify image file" when trying to use a variable instead of an absolute path. Here's the code that I'm using:
import os
from PIL import Image, ExifTags
source = raw_input("Enter the path to scan")
os.chdir(source)
for root, dirs, files in os.walk(source):
for file_name in files:
img = Image.open(file_name)
exif = { ExifTags.TAGS[k]: vars for k, vars in img._getexif().items() if k in ExifTags.TAGS }
print exif
I have also tried using StringIO per a tip I noticed while Google searching my problem. The code is the same as above except I import StringIO and make the following change in the Image.open code:
img = Image.open(StringIO(file_name))
This did not fix the problem and I get the same error. If I give a path instead of a variable in Image.open, it does work correctly so I know the problem is trying to use a variable. Is there a way to do this that I'm missing?

You need to use this code instead:
img = Image.open(os.path.join(root, file_name))
If you have any non-image files in your directory hierarchy, then you will still have an error when you try to open them, but that is a legitimate error, so you could do something like:
try:
img = Image.open(os.path.join(root, file_name))
except IOError:
print "Error: %s does not appear to be a valid image" % (os.path.join(root, file_name))
else:
exif = ...