tinyjpg() Benchmarks

1 Overview

This document benchmarks the tinyjpg() function from the tinyimg package across different quality levels. We test with three types of plots:

1. A scatterplot based on the penguins dataset
2. A simple boxplot (simpler graphics)
3. A complex 3D perspective plot (more complex graphics)

For each quality level, we measure:

• File size reduction (in KB and percentage)
• Time taken for optimization

2 Test Plots

First, we create test plots using the jpeg() device (set as default via the chunk option dev = 'jpeg'):

3 Benchmarks

Now let’s optimize these JPEG files at different quality levels and measure the results:

#> scatterplot-1.jpeg -> scatterplot_q10.jpg | 28.1 KB -> 5.4 KB (-80.9%)
#> scatterplot-1.jpeg -> scatterplot_q30.jpg | 28.1 KB -> 10.9 KB (-61.2%)
#> scatterplot-1.jpeg -> scatterplot_q50.jpg | 28.1 KB -> 14.6 KB (-47.9%)
#> scatterplot-1.jpeg -> scatterplot_q70.jpg | 28.1 KB -> 19.0 KB (-32.5%)
#> scatterplot-1.jpeg -> scatterplot_q80.jpg | 28.1 KB -> 22.9 KB (-18.3%)
#> scatterplot-1.jpeg -> scatterplot_q90.jpg | 28.1 KB -> 30.6 KB (+8.9%)
#> scatterplot-1.jpeg -> scatterplot_q95.jpg | 28.1 KB -> 38.8 KB (+38.1%)
#> boxplot-1.jpeg -> boxplot_q10.jpg | 18.4 KB -> 4.2 KB (-77.0%)
#> boxplot-1.jpeg -> boxplot_q30.jpg | 18.4 KB -> 7.1 KB (-61.5%)
#> boxplot-1.jpeg -> boxplot_q50.jpg | 18.4 KB -> 8.8 KB (-52.3%)
#> boxplot-1.jpeg -> boxplot_q70.jpg | 18.4 KB -> 10.5 KB (-43.1%)
#> boxplot-1.jpeg -> boxplot_q80.jpg | 18.4 KB -> 11.9 KB (-35.6%)
#> boxplot-1.jpeg -> boxplot_q90.jpg | 18.4 KB -> 14.4 KB (-21.9%)
#> boxplot-1.jpeg -> boxplot_q95.jpg | 18.4 KB -> 16.7 KB (-9.1%)
#> persp-1.jpeg -> persp_q10.jpg | 43.9 KB -> 5.8 KB (-86.8%)
#> persp-1.jpeg -> persp_q30.jpg | 43.9 KB -> 14.9 KB (-66.0%)
#> persp-1.jpeg -> persp_q50.jpg | 43.9 KB -> 21.1 KB (-52.0%)
#> persp-1.jpeg -> persp_q70.jpg | 43.9 KB -> 29.4 KB (-33.0%)
#> persp-1.jpeg -> persp_q80.jpg | 43.9 KB -> 36.5 KB (-16.9%)
#> persp-1.jpeg -> persp_q90.jpg | 43.9 KB -> 46.0 KB (+4.7%)
#> persp-1.jpeg -> persp_q95.jpg | 43.9 KB -> 55.0 KB (+25.2%)

Plot	Quality	Size_KB	Reduction_pct	Time_sec
scatterplot	10	5.376	80.853	0.023
scatterplot	30	10.891	61.212	0.026
scatterplot	50	14.631	47.891	0.027
scatterplot	70	18.956	32.486	0.031
scatterplot	80	22.940	18.295	0.035
scatterplot	90	30.574	-8.894	0.041
scatterplot	95	38.778	-38.113	0.046
boxplot	10	4.229	77.023	0.021
boxplot	30	7.081	61.531	0.022
boxplot	50	8.782	52.289	0.023
boxplot	70	10.471	43.116	0.025
boxplot	80	11.855	35.593	0.025
boxplot	90	14.372	21.922	0.029
boxplot	95	16.738	9.067	0.028
persp	10	5.806	86.789	0.023
persp	30	14.937	66.012	0.029
persp	50	21.086	52.019	0.039
persp	70	29.425	33.044	0.047
persp	80	36.500	16.944	0.050
persp	90	46.007	-4.689	0.055
persp	95	55.025	-25.211	0.062

A visual comparison of the quality optimization results:

4 Visualization