PIL

from PIL import Image

• 打开图像

img = Image.open(path)

• 基本变换

img_resize = img.resize((400, 400), Image.Resampling.LANCZOS)
img_gray = img.convert('L')
img_rotate = img.rotate(45, expand=True)

LANCZOS 插值使用 Lanczos kernel {\displaystyle L(x)={\begin{cases}\operatorname {sinc} (x)\operatorname {sinc} (x/a)&{\text{if}}\ -a<x<a,\\0&{\text{otherwise}}.\end{cases}}}

{\displaystyle L(x,y)=L(x)L(y)}对图片进行插值

expand=True 时增广的部分填充 (0, 0, 0)

• 卷积

锐化核 \displaystyle\frac{1}{9}\begin{bmatrix} -1 & -1 & -1 \\ -1 & 9 & -1 \\ -1 & -1 & -1 \end{bmatrix}作用

from PIL import Image, ImageFilter
img_sharpen = img.filter(ImageFilter.Kernal((3, 3), kernel.flatten())

• numpy

import numpy as np
img_arr = np.array(img)
img_arr[:, :, 1] = 0
img_nogreen = Image.fromarray(img_arr)

• 混合

img_blend = Image.blend(img, img_nogreen, alpha=0.7)

混合方法是 \text{img1} \cdot (1 - \alpha) + \text{img2} \cdot \alpha

• 生成 GIF

frames = [img.rotate(i * 12, expand=True) for i in range(30)]
frames[0].save(path, save_all=True, append_images=frames[1:], loop=0, duration=60)

指定每帧播放 60 ms

moviepy

import moviepy.editor as mpy
img_seq = [mpy.ImageClip(img).set_duration(1/fps) for img in frames]
video = mpy.concatenate_videoclips(img_seq, method='compose')
audio = AudioFileClip(path)

笔者吐槽：用 Python 剪辑视频完全是意义不明的事情...

TTS

import pyttsx3
engine = pyttsx3.init()

engine.setProperty('rate', 180)
engine.save_to_file(text, path)
engine.runAndWait()