ImageFont IO 错误：无法打开资源

Question

I am new to Python and tried to run the following code. I received the following error "IOError: cannot open resource" . Is this due to the fact that some of the Image characteristics do not longer exist (eg Coval.otf), or is it potentially due to writing/reading restrictions? please let me know - many thanks, W

import numpy as np
from PIL import Image, ImageDraw, ImageFont
from skimage import transform as tf

def create_captcha(text, shear=0, size=(100,24)):
    im = Image.new("L", size, "black")
    draw = ImageDraw.Draw(im)
    font = ImageFont.truetype(r"Coval.otf", 22)
    draw.text((2, 2), text, fill=1, font=font)
    image = np.array(im)
    affine_tf = tf.AffineTransform(shear=shear)
    image = tf.warp(image, affine_tf)
    return image / image.max()

%matplotlib inline
from matplotlib import pyplot as plt
image = create_captcha("GENE", shear=0.5)

Answer 1

It's because Coval.otf cannot be read, probably because it doesn't exist on your system, this is specified in the ImageFont doc . I tried searching for the specific font and found no way of aquiring it . Look at @NewYork167's link if you must use the Coval font.

Either way, to save yourself the trouble of installing fonts, you could just change the call to a font that exists on your system, use the one specified in the example of the docs:

font = ImageFont.truetype("arial.ttf", 15)

Answer 2

For me after running the following:

conda install -c conda-forge graphviz
conda install -c conda-forge python-graphviz

and then linking the font on mac by:

 img = Image.open("tree1.png")
 draw = ImageDraw.Draw(img)
 font = ImageFont.truetype('/Library/Fonts/Arial.ttf', 15)

It worked perfectly.

Answer 3

If you are using colab then you will have to provide path properly just writing arial.ttf is not sufficient. To get the path if that font-type is available on colab : !fc-list or !fc-list | grep "" and then you can add the whole path. enter image description here

Answer 4

看起来您可以从这里安装 Coval，以免您在以后的代码中也不必更改字体https://fontlibrary.org/en/font/bretan

Answer 5

The font files for PIL on windows are case sensitive. Go to Windows/fonts:

Some fonts are *.tff

Others are *.TFF

You have to use the actual file name and not the font title thingy that Windows shows from control panel.

Answer 6

I also found that for Anaconda3 2019.03 the truetype font var is case sensitive. I'm using Windows 10, and had to look in C:\\Windows\\Fonts. Looking at the properties I saw the 'Arial.ttf' font was 'arial.ttf' in the explorer.

ImageFont.truetype('arial.ttf') works while ImageFont.truetype('Arial.ttf') throws a 'cannot open resource' error.

Annoying change, but worked for me.

Answer 7

In my case (Centos, Python 3.6.6), the font requires absolute path like:

ttfont = ImageFont.truetype('/root/pyscripts/arial.ttf',35)

The relative path like ~/pyscripts/arial.ttf won't work.