Currently I am using:
os.chdir(album.path)
images = glob.glob('*.*')
# thumbs size
size = 80,80
for image in images:
#create thumb
file, ext = os.path.splitext(image)
im = Image.open(os.path.join(album.path,image))
im.thumbnail(size, Image.ANTIALIAS)
thumb_path = os.path.join(album.path, 'thumbs', file + ".thumb" + ".jpeg")
im.save(thumb_path)
Although this works, I end up with different sizes images (some are portrait and some are landscape), but I want all of the images to have an exact size. Maybe a sensible cropping?
UPDATE:
I don't mind cropping a small portion of the image. When I said sensible cropping I mean something like this algorythm:
if image is portrait:
make width 80px
crop the height (will be more than 80px)
else if image is landscape:
make height 80px
crop the width to 80px (will be more than 80px)
Here is my take on doing a padded fit for an image:
#!/usr/bin/env python
from PIL import Image, ImageChops
F_IN = "/path/to/image_in.jpg"
F_OUT = "/path/to/image_out.jpg"
size = (80,80)
image = Image.open(F_IN)
image.thumbnail(size, Image.ANTIALIAS)
image_size = image.size
thumb = image.crop( (0, 0, size[0], size[1]) )
offset_x = max( (size[0] - image_size[0]) / 2, 0 )
offset_y = max( (size[1] - image_size[1]) / 2, 0 )
thumb = ImageChops.offset(thumb, offset_x, offset_y)
thumb.save(F_OUT)
It first uses the thumbnail operation to bring the image down to within your original bounds and preserving the aspect. Then it crops it back out to actually fill the size of your bounds (since unless the original image was square, it will be smaller now), and we find the proper offset to center the image. The image is offset to the center, so you end up with black padding but no image cropping.
Unless you can make a really sensible guess at a proper center crop without losing possible important image data on the edges, a padded fit approach will work better.
Update
Here is a version that can do either center crop or pad fit.
#!/usr/bin/env python
from PIL import Image, ImageChops, ImageOps
def makeThumb(f_in, f_out, size=(80,80), pad=False):
image = Image.open(f_in)
image.thumbnail(size, Image.ANTIALIAS)
image_size = image.size
if pad:
thumb = image.crop( (0, 0, size[0], size[1]) )
offset_x = max( (size[0] - image_size[0]) / 2, 0 )
offset_y = max( (size[1] - image_size[1]) / 2, 0 )
thumb = ImageChops.offset(thumb, offset_x, offset_y)
else:
thumb = ImageOps.fit(image, size, Image.ANTIALIAS, (0.5, 0.5))
thumb.save(f_out)
source = "/path/to/source/image.JPG"
makeThumb(source, "/path/to/source/image_padded.JPG", pad=True)
makeThumb(source, "/path/to/source/image_centerCropped.JPG", pad=False)