PIL如何调整图像大小以填充高度和宽度尺寸

Question

我有一组随机尺寸的图像，想将它们转换为标准尺寸 (244,244)。使用 PIL Image resize() 会将图片转换为合适的大小，但在未填充的 space 显示 here 处有黑色边框填充。我想通过拉伸图像以填充整个高度和宽度来删除黑色边框这是预处理图片的函数：

path = "data/oyaku_don_source/"
dirs = os.listdir( path )
final_size = 244;

def resize_aspect_fit():
    for item in dirs:
        if item == '.DS_Store':
            continue
        if os.path.isfile(path+item):
            im = Image.open(path+item)
            f, e = os.path.splitext(path+item)
            size = im.size
            ratio = float(final_size) / max(size)
            new_image_size = tuple([int(x*ratio) for x in size])
            im = im.resize((244, 244), Image.ANTIALIAS)
            
            new_im = Image.new("RGB", (final_size, final_size))
            new_im.paste(im, ((final_size-new_image_size[0])//2, (final_size-new_image_size[1])//2))
            new_im.save('data/Oyaku_Don/'+str(uuid.uuid4().fields[-1])[:5]+'.jpg', 'JPEG', quality=90)

如有任何建议，我们将不胜感激，谢谢

Answer 1

我得到黑边的原因是 new_img。图片在 resize() 后立即被拉伸，所以我立即保存了图片。

from PIL import Image
import os, sys
import uuid
#input path
path = "data/oyaku_don_source/"
dirs = os.listdir( path )
final_size = 244;

def resize_image():
    for item in dirs:
        if item == '.DS_Store':
            continue
        if os.path.isfile(path+item):
            im = Image.open(path+item)
            f, e = os.path.splitext(path+item)
            size = im.size
            ratio = float(final_size) / max(size)
            new_image_size = tuple([int(x*ratio) for x in size])
            im = im.resize((244, 244), Image.ANTIALIAS)
            #output path with a unique id
            im.save('data/Oyaku_Don/'+str(uuid.uuid4().fields[-1])[:5]+'.jpg', 'JPEG', quality=90)

PIL如何调整图像大小以填充高度和宽度尺寸

PIL how to resize image to fill up height and width dimension

python

python-imaging-library