Using Python to Resize Images when Greater than 1280 on either side

Question

I want to use Python to resize any image based on the following 2 conditions.

1) If an image is landscape, get width, if greater than 1280 resize image width to 1280 maintaining aspect ratio.

2) If an image is portrait, get height, if greater than1280 resize height to 1280 maintaining aspect ratio.

In Python what is the best package/approach to achieve this? Without knowing what to use this is how I see it working.

Pseudocode:

If image.height > image.width:
  size = image.height

If image.height < image.width:
  size = image.width

If size > 1280:
  resize maintaining aspect ratio

I was looking at Pillow (PIL).

Answer 1

You can do it via PIL, something like this:

import Image

MAX_SIZE = 1280
image = Image.open(image_path)
original_size = max(image.size[0], image.size[1])

if original_size >= MAX_SIZE:
    resized_file = open(image_path.split('.')[0] + '_resized.jpg', "w")
    if (image.size[0] > image.size[1]):
        resized_width = MAX_SIZE
        resized_height = int(round((MAX_SIZE/float(image.size[0]))*image.size[1])) 
    else:
        resized_height = MAX_SIZE
        resized_width = int(round((MAX_SIZE/float(image.size[1]))*image.size[0]))

    image = image.resize((resized_width, resized_height), Image.ANTIALIAS)
    image.save(resized_file, 'JPEG')

Additionaly, you can remove original image and rename resized.