如何提高插入 MS Word 文档表中的 matplotlib 图像 (jpg) 的质量？

Question

我有一个主要的Python模块，它创建一个带有表格的Word文档，然后调用另一个模块，该模块创建并返回一个简单的多边形笛卡尔图。主模块将绘图插入表中的单元格中，然后循环再次执行此操作。这是主要模块：

import os
import random
from docx import Document
from docx.shared import Inches
from datetime import datetime
from docx.oxml import OxmlElement, ns
import Trapezoid_in_Cartesian_Grid_1
from PIL import Image
from pathlib import Path

doc = Document()

tbl = doc.add_table(rows=1, cols=0)
tbl.add_column(width=Inches(0.4))
tbl.add_column(width=Inches(3.0))
tbl.add_column(width=Inches(3.0))


def image_to_jpg(image_path):
    path = Path(image_path)
    if path.suffix not in {'.jpg', '.png', '.jfif', '.exif', '.gif', '.tiff', '.bmp'}:
        jpg_image_path = f'{path.parent / path.stem}_result.png'
        Image.open(image_path).convert('RGB').save(jpg_image_path, quality = 95)
        return jpg_image_path
    return image_path


for i in range(10):
    a = random.randint(-8,8)
    b = random.randint(-8,8)
    h = random.randint(-3,3)
    k = random.randint(-3,3)
    path = Trapezoid_in_Cartesian_Grid_1.ReflectTrap01OverXaxis(a,b,h,k)
    image_path = image_to_jpg(path)
    
    row = tbl.add_row()
    cell1 = tbl.cell(i,0)
    cell1.text = str(i+1) + "."
    cell2 = tbl.cell(i,1) 
    cell2.text = "Reflect the figure over the y-axis."
    cell3 = tbl.cell(i,2)
    paragraph = tbl.rows[i].cells[2].paragraphs[0]
    run = paragraph.add_run()
    run.add_picture(image_path)
   
# get current date and time and convert to string
current_datetime = datetime.now().strftime("%Y-%m-%d %H%M%S")
print("Current date & time : ", current_datetime)
str_current_datetime = str(current_datetime)
 
# create a file object along with extension
file_name = "WS_Proj " + str_current_datetime
header = doc.sections[0].header
header.paragraphs[0].text = file_name

doc.save(file_name + ".docx")

调用的模块、函数ReflectTrap01OverXaxis是：

from datetime import datetime
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.path import Path
import matplotlib.patches as patches
from matplotlib.ticker import MultipleLocator
from docx.shared import Inches
import matplotlib.ticker as ticker
import random

a = random.randint(-8,8)
b = random.randint(-8,8)
h = random.randint(3,6)
k = random.randint(3,6)

current_datetime = datetime.now().strftime("%Y-%m-%d %H%M%S")
str_current_datetime = str(current_datetime)


def ReflectTrap01OverXaxis(a,b,h,k):
       
   #Creates a polygon with certain vertices (verts1)
    verts1 = [(a,b),(a+h,b),(a+h,b-k),(a,b-k+1),(a,b)]
    codes1 = [Path.MOVETO, Path.LINETO, Path.LINETO, Path.LINETO, Path.CLOSEPOLY]
    fig = plt.figure(figsize=(2.5,2.5))
    ax = fig.add_subplot(111)
    path1 = Path(verts1, codes1)
    patch1 = patches.PathPatch(path1, edgecolor = "black", facecolor = "None", lw=0.8, zorder = 3)
    ax.add_patch(patch1)
    
   #Sets x and y axes
    ax.set_xlim(-12,12)
    ax.set_ylim(-12,12)
    plt.grid(True)
    plt.tick_params(labelsize = 6)
    plt.xlabel(None, fontsize = 9)
   #Determines the size of the plot
    plt.rcParams["figure.figsize"] = [3,3]
    
    
    plt.axhline(color = "black")
    plt.axvline(color = "black")
    
    ax.grid(which = "both",color = "black", linewidth=0.5)
    ax.minorticks_on()
    
   #Creates a unique file name with date and time
    current_datetime = datetime.now().strftime("%Y-%m-%d %H%M%S")
    str_current_datetime = str(current_datetime)
    file_name = "fig1 " + str_current_datetime
    plt.savefig(file_name, format = "png")
    
    return file_name

插入表格的 jpg 质量太低。我在这里和其他地方进行了研究，并且尝试了不同的图像文件格式，例如 svg 和 pdf。我也尝试过更改 dpi。当我增加 dpi 时，质量会提高，但图像尺寸也会提高，并且图像必须适合 3 英寸宽的表格列。这是 Word 文档的屏幕截图和低质量图像。提前致谢。

Answer 1

如果您的目标是 MS Word 并且您的数据采用电子表格形式（见左下），那么通过“图表”将数据作为向量直接嵌入到页面中是相当简单的。优点是您可以为不同的视图选择系列，例如问题和答案。因此只需编程打开和关闭即可导出为 PDF。

取决于技能，品质无法超越。