get_glyph_img.py

#!/usr/bin/env python3
# -*- encoding: utf8 -*-
import os, json
import numpy as np
from PIL import Image, ImageDraw, ImageFont

def get_glyph_img(character, fontname,
    pt = 1024, binarize = True,
    descent_offset = True):
    """Get image of a certain glyph from the given font

    Parameters
    ----------
    character: str
        The character to draw
    pt: int
        Number of pixels horizontally and vertically
    binarize: boolean
        Return a binary image or not
    fontname: str
        The font file name
    
    Returns
    ----------
    glyph_img: numpy.ndarray
        A greyscale image of the glyph, with its foreground in white (255) and
        background in black (0). 
    """
    font = ImageFont.truetype(fontname, pt)
    _, descent = font.getmetrics()
    start = -descent if descent_offset else 0
    img = Image.new('L', (pt, pt), 0)
    draw = ImageDraw.Draw(img)
    draw.text((0, start), character, 255, font = font)
    img_array = np.array(img, dtype = np.uint8)
    if not binarize: return img_array
    else: return (img_array > 128).astype(np.uint8)