link: https://blog.csdn.net/qq_41775810/article/details/82798906
調用keras庫去訓練樣本的時候，經常會用target_size吧圖片resize自己想要的形狀繼續訓練，可是需要預測的時候想單張把圖片放進去預測，需要重復相同的resize步驟，於是看了源碼，在image.py中有找到了方法
def load_img(path, grayscale=False, color_mode='rgb', target_size=None,
interpolation='nearest'):
"""Loads an image into PIL format.
# Arguments
path: Path to image file.
color_mode: One of "grayscale", "rbg", "rgba". Default: "rgb".
The desired image format.
target_size: Either `None` (default to original size)
or tuple of ints `(img_height, img_width)`.
interpolation: Interpolation method used to resample the image if the
target size is different from that of the loaded image.
Supported methods are "nearest", "bilinear", and "bicubic".
If PIL version 1.1.3 or newer is installed, "lanczos" is also
supported. If PIL version 3.4.0 or newer is installed, "box" and
"hamming" are also supported. By default, "nearest" is used.
# Returns
A PIL Image instance.
# Raises
ImportError: if PIL is not available.
ValueError: if interpolation method is not supported.
"""
if grayscale is True:
warnings.warn('grayscale is deprecated. Please use '
'color_mode = "grayscale"')
color_mode = 'grayscale'
if pil_image is None:
raise ImportError('Could not import PIL.Image. '
'The use of `array_to_img` requires PIL.')
img = pil_image.open(path)
if color_mode == 'grayscale':
if img.mode != 'L':
img = img.convert('L')
elif color_mode == 'rgba':
if img.mode != 'RGBA':
img = img.convert('RGBA')
elif color_mode == 'rgb':
if img.mode != 'RGB':
img = img.convert('RGB')
else:
raise ValueError('color_mode must be "grayscale", "rbg", or "rgba"')
if target_size is not None:
width_height_tuple = (target_size[1], target_size[0])
if img.size != width_height_tuple:
if interpolation not in _PIL_INTERPOLATION_METHODS:
raise ValueError(
'Invalid interpolation method {} specified. Supported '
'methods are {}'.format(
interpolation,
", ".join(_PIL_INTERPOLATION_METHODS.keys())))
resample = _PIL_INTERPOLATION_METHODS[interpolation]
img = img.resize(width_height_tuple, resample)
return img
可以看出，是用pil中nearest（默認）的模式resize的，所以只需要按照相同的方法resize就OK了
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原文鏈接：https://blog.csdn.net/qq_41775810/article/details/82798906