5. Image save

See: https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.save

5.1. Save

Use the Image.save(file, format=None, **params) method to save the image under the given filename. If no format is specified, the format to use is determined from the filename extension, if possible.
file - A filename (string), pathlib.Path object or file object. You can use a file object instead of a filename. In this case, you must always specify the format. The file object must implement the seek, tell, and write methods, and be opened in binary mode.
format - Optional format override. If omitted, the format to use is determined from the filename extension. If a file object was used instead of a filename, this parameter should always be used.
params - Extra parameters to the image writer.

5.2. Same file type

The code below saves an image.

from PIL import Image

with Image.open("arrows/Narrow.png") as im:
    im.save("arrows/arrow_0.png")

5.3. Save as JPEG

The file extension in the new file name is used to specify the file type for saving.
PNGs need to have the alpha channel removed to save the image as a jpg.
Use the .convert(‘RGB’) method to convert a png image to a jgp before attempting to save it.
Use the .save method specifying the quality parameter as quality=95 for best quality.

from PIL import Image

with Image.open("shapes/box.png") as im:
    new_im = im.convert('RGB')
    new_im.save("shapes/box.jpg", quality=95)

5.4. Save as PNG

The file extension in the new file name is used to specify the file type for saving.
PNGs need to have the alpha channel removed to save the image as a jpg.
compress_level is a number between 0 and 9: 1 gives best speed, 9 gives best compression, 0 gives no compression at all. Default is 6.

from PIL import Image

with Image.open("shapes/box.jpg") as im:
    new_im.save("shapes/box.png", compress_level=9)

5.5. Saving gifs

See : https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#gif-saving

The code below modifies all frames and saves them.

from PIL import Image, ImageSequence


def addOverlay(frame):
    im = Image.open('image/ambulance_L.jpg')
    position = 'bottomRight'
    coords = {
        'topLeft': (0, 0),
        'bottomRight': (frame.width - im.width, frame.height - im.height)
    }
    frame.paste(im, coords[position])
    return frame

with Image.open("new_gifs/transform_tilt_x.gif") as im_gif:
    # Run 'addOverlay' on each frame in the image
    frames = ImageSequence.all_frames(im_gif, addOverlay)
    # Save the frames as a new image
    frames[0].save('new_gifs/transform_tilt_x_overlay.gif', save_all=True, append_images=frames[1:])