我知道使用 pdflatex 创建动画 gif 的唯一方法是生成每一帧并应用 imagemagicks convert。问题是所有帧中都有很多东西
pdflatex animation.tex -output-format=pdf
pdfcrop animation.pdf
convert -verbose -delay 10 -loop 0 -density 300 animation-crop.pdf animation.gif
- 原始尺寸：1708px x 829px；2.5MB
- 删除
[background rectangle/.style={fill=white}, show background rectangle]：1.6 MB（但字符看起来像素化/不好看） - 缩小至 1200px：1.8MB
- 申请优化器：92.92KiB
有什么方法可以用 pdflatex 生成小图像，例如不一直重新绘制轴？
完整示例
\documentclass[varwidth=false, border=2pt]{beamer}
\usepackage{tikz,pgfplots,multido}
\usetikzlibrary{backgrounds}
\pgfplotsset{compat=1.17}
\usepackage{nicefrac}
\pgfplotsset{every axis legend/.append style={
at={(0,0)},
anchor=north east}}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\begin{document}
\multido{\i=0+1}{100}{%
\begin{tikzpicture}[background rectangle/.style={fill=white}, show background rectangle]
\begin{axis}[
axis x line=middle,
axis y line=middle,
grid = major,
width=16cm,
height=8cm,
grid style={dashed, gray!30},
xmin=-2.1, % start the diagram at this x-coordinate
xmax= 4.1, % end the diagram at this x-coordinate
ymin= 0, % start the diagram at this y-coordinate
ymax= 17, % end the diagram at this y-coordinate
xlabel=$x$,
ylabel=$y$,
ytick={0,2,3,4,8,9,12,16},
yticklabels={0,2,3,4,8,9,12,16},
legend cell align=left,
legend pos=south east,
legend style={draw=none},
tick align=outside,
enlargelimits=false]
% plot the function
\addplot[domain=-2:{-1.5 + (9.5*\i/100)}, red, ultra thick,samples=500] {2^x};
\addplot[domain=-2:{-1.5 + (7.5*\i/100)}, blue, ultra thick,samples=500] {3^x};
\addplot[domain=-2:{-1.5 + (6.5*\i/100)}, green, ultra thick,samples=500] {4^x};
\end{axis}
\end{tikzpicture}
}
\end{document}
答案1
仅用于比较目的！
我通过以下方式重现了你的代码渐近线我得到：
原始文件：~855KB
Gif 文件：~1MB
import animate;
settings.tex="pdflatex";
animation Ani;
real width=16cm;
real height=8cm;
size(width,height,false);
import graph;
real f(real x){return 2^x;}
real g(real x){return 3^x;}
real h(real x){return 4^x;}
int samples=500;
real xmin=-2.1;
real xmax=4.1;
real ymin=0;
real ymax=17;
for(int a=-5; a<=60;++a)
{
save();
picture pic;
path F=graph(f,-2,-1.5+(9.5*a/100),samples),
G=graph(g,-2,-1.5+(7.5*a/100),samples),
H=graph(h,-2,-1.5+(6.5*a/100),samples);
draw(pic,F,red+2.5bp);
draw(pic,G,blue+2.5bp);
draw(pic,H,green+2.5bp);
clip(pic,box((xmin,ymin),(xmax,ymax)));
real marginx=.4, marginy=0.05;
for (real i: new real[]{-2,-1.5,-1,-0.5,0.5,1,1.5,2,2.5,3,3.5,4}){
draw((i,ymin)--(i,ymax),linetype(new real[] {10,10})+gray+opacity(30/100)+0.2bp);
draw(scale(0.8)*Label("$"+(string) i+"$",Relative(0)),(i,0)-(0,marginx)--(i,0));
}
for (int j: new int[]{2,3,4,8,9,12,16}){
draw((xmin,j)--(xmax,j),linetype(new real[] {10,10})+gray+opacity(30/100)+0.2bp);
draw(scale(0.8)*Label("$"+(string) j+"$",Relative(0)),(0,j)-(marginy,0)--(0,j));
}
draw(Label("$x$",EndPoint,LeftSide),(xmin,0)--(xmax,0),Arrow(TeXHead));
draw(Label("$y$",Relative(0.99)),(0,ymin)--(0,ymax),Arrow(TeXHead));
add(pic);
Ani.add();
restore();
}
erase();
Ani.movie(BBox(Fill(white)));
我们为什么需要picture pic？
-> 因为我们通常希望首先显示图形。
答案2
使用 LaTeX 生成高质量动画 GIF 后，您可以使用第三方程序（非 LaTeX）来压缩 GIF（“压缩“表示减小文件大小）。
以下网站还可以，只是输出是高度压缩的.mp4，而不是实际的.gif。