Question

我可以制作图像并将其保存为文件：

Img1 = PIL.Image.new('RGB', (512,512))
display(newImg1)
Img1.save("img1.jpg","JPEG")

但此图像无法保存

import numpy as np
import PIL.Image

def makePic(a, fmt='jpeg'):
    a = np.uint8(np.clip(a, 0, 255))
    f = StringIO()
    result=PIL.Image.fromarray(a).save(f, fmt)
    result=(Image(data=f.getvalue()))
    return result


Img2 = np.float32(PIL.Image.new('RGB', (512,512)))
imag=makePic(Img2)
display(imag)
imag.save("img1.jpg","JPG")

----> 4 imag.save("img1.jpg","JPG")

AttributeError: 'Image' object has no attribute 'save'

display（imag）可以很好地显示图片，但是python认为它不是图片。为什么？

Answer 1

该线程给了我线索： image does not display in ipython

不幸的是，现在不推荐使用“ scipy.misc.imsave”，我必须使用imageio

但是我不能简单地

pip install imageio

它给了我一些有关使用sudo和-H标志的技巧。好吧，我做到了，确实，当我启动python时，我可以做到这一点

>>>import imageio
>>>

但是当我启动jupyter-notebook时，笔记本很笨拙，并说“没有名为imageio的模块”

所以我尝试再次安装它并得到了

$pip install imageio
Requirement already satisfied: imageio in /usr/local/lib/python3.6/dist-packages (2.5.0)
Requirement already satisfied: pillow in /usr/lib/python3/dist-packages (from imageio) (5.1.0)
Requirement already satisfied: numpy in /usr/lib/python3/dist-packages (from imageio) (1.13.3)

它如何最终出现在python3目录中？所以我决定尝试一下

$python -m pip install imageio --user
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Requirement already satisfied: imageio in ./.local/lib/python2.7/site-packages (2.5.0)
Requirement already satisfied: futures in /usr/local/lib/python2.7/dist-packages (from imageio) (3.2.0)
Requirement already satisfied: numpy in /usr/lib/python2.7/dist-packages (from imageio) (1.13.3)
Requirement already satisfied: enum34 in /usr/lib/python2.7/dist-packages (from imageio) (1.1.6)
Requirement already satisfied: pillow in /usr/local/lib/python2.7/dist-packages (from imageio) (5.4.1)

我为什么要继续使用python 2.7？好吧，因为我有这些相当长的python程序，所以我不希望进行故障排除以使其在python3中工作。无论如何，现在当我打开jupyter-notebook时，我可以这样做

import numpy as np
import PIL.Image
import imageio
from IPython.display import clear_output, Image, display

img2 = np.float32(PIL.Image.new('RGB', (256,512)))
imageio.imwrite('test.jpg', img2[:, :, 0])

，它将正确的jpg保存到磁盘。但是，如果我尝试这样看待它

display(img2)

显然，我只是得到了numpy数组。所以要显示它，我必须像这样用makePic def转换数组：

img2 = np.float32(PIL.Image.new('RGB', (125,512)))
imageio.imwrite('test.jpg', img2[:, :, 0])
#display(img2)
image=makePic(img2)
display(image)

有趣的是，imageio.imwrite调用只是将numpy数组写入磁盘，但是当我转到该文件并在ubuntu中打开它时，很明显，图像查看器会将numpy数组转换为图像。

无法使用PIL保存图像

1 个答案: