读图片 str or file object-- ndarray

scipy.ndimage. imread ( *args , **kwds )

imread is deprecated! imread is deprecated in SciPy 1.0.0, and will be removed in 1.2.0. Use imageio.imread instead.

在 1.2.0版本用 imageio.imread 代替

Read an image from a file as an array. 从文件中把图片读成数组

This function is only available if Python Imaging Library (PIL) is installed. 该功能只在安装了 PIL情况下使用

fname : str or file object

The file name or file object to be read.

flatten : bool, optional

If True, flattens （扁平化） the color layers into a single gray-scale （灰度） layer.

将彩色层转化成单个灰度层

mode : str, optional

Mode to convert image to, e.g. 'RGB' . See the Notes for more details.

Notes

imread uses the Python Imaging Library (PIL) to read an image. The following notes are from the PIL documentation.

mode can be one of the following strings:

· ‘L’ (8-bit pixels, black and white)

· ‘P’ (8-bit pixels, mapped to any other mode using a color palette)

· ‘RGB’ (3x8-bit pixels, true color)

· ‘RGBA’ (4x8-bit pixels, true color with transparency mask)

· ‘CMYK’ (4x8-bit pixels, color separation)

· ‘YCbCr’ (3x8-bit pixels, color video format)

· ‘I’ (32-bit signed integer pixels)

· ‘F’ (32-bit floating point pixels)

PIL also provides limited support for a few special modes, including ‘LA’ (‘L’ with alpha), ‘RGBX’ (true color with padding) and ‘RGBa’ (true color with premultiplied alpha).

When translating a color image to black and white (mode ‘L’, ‘I’ or ‘F’), the library uses the ITU-R 601-2 luma transform:

L = R * 299 / 1000 + G * 587 / 1000 + B * 114 / 1000

When flatten is True, the image is converted using mode ‘F’. When mode is not None and flatten is True, the image is first converted according to mode , and the result is then flattened using mode ‘F’.

调整图片尺寸 ndarray-- ndarray

scipy.misc.imresize ( *args , **kwds )