I would like to create a Python script to resize images, but not changing its proportions, just by adding a white background
(So, a : 500*700 px im
Thanks @Jay D., here a bit more general version:
from PIL import Image
def resize(image_pil, width, height):
'''
Resize PIL image keeping ratio and using white background.
'''
ratio_w = width / image_pil.width
ratio_h = height / image_pil.height
if ratio_w < ratio_h:
# It must be fixed by width
resize_width = width
resize_height = round(ratio_w * image_pil.height)
else:
# Fixed by height
resize_width = round(ratio_h * image_pil.width)
resize_height = height
image_resize = image_pil.resize((resize_width, resize_height), Image.ANTIALIAS)
background = Image.new('RGBA', (width, height), (255, 255, 255, 255))
offset = (round((width - resize_width) / 2), round((height - resize_height) / 2))
background.paste(image_resize, offset)
return background.convert('RGB')
The other answer didn't work for me, I rewrote it and this worked:
def resize_with_pad(im, target_width, target_height):
'''
Resize PIL image keeping ratio and using white background.
'''
target_ratio = target_height / target_width
im_ratio = im.height / im.width
if target_ratio > im_ratio:
# It must be fixed by width
resize_width = target_width
resize_height = round(resize_width * im_ratio)
else:
# Fixed by height
resize_height = target_height
resize_width = round(resize_height / im_ratio)
image_resize = im.resize((resize_width, resize_height), Image.ANTIALIAS)
background = Image.new('RGBA', (target_width, target_height), (255, 255, 255, 255))
offset = (round((target_width - resize_width) / 2), round((target_height - resize_height) / 2))
background.paste(image_resize, offset)
return background.convert('RGB')
Finally did it :
def Reformat_Image(ImageFilePath):
from PIL import Image
image = Image.open(ImageFilePath, 'r')
image_size = image.size
width = image_size[0]
height = image_size[1]
if(width != height):
bigside = width if width > height else height
background = Image.new('RGBA', (bigside, bigside), (255, 255, 255, 255))
offset = (int(round(((bigside - width) / 2), 0)), int(round(((bigside - height) / 2),0)))
background.paste(image, offset)
background.save('out.png')
print("Image has been resized !")
else:
print("Image is already a square, it has not been resized !")
Thanks to @Blotosmetek for the suggestion, pasting a centered image is definitely simpler than creating images and combining them !
PS : If you don't have PIL yet, the library's name to install it with pip is "pillow", not PIL. But still, you use it as PIL in the code.