Article^ Parent
计算机图片尺寸笔记
| Date: | 2018-10-17 00:00:00 |
| Description: | 计算机图片尺寸笔记。 |
| Keywords: | 图片, ppi |
| Category: | engineering_technology/computer/software/media/general |
| Tag: | graphic |
| Link: | https://www.diewuxi.com/blog/article/85.html |
Changelog
* 2018-10-17
* Done
Relations
$$s = k * l$$
s: logical size, unit pixels
k: density, unit pixels/inch
l: practical size, inch
1 inch = 2.45 cm = 72 pt
Logic size in different density and practical size
A4 paper: 21 cm * 19 cm, Half width figure 8 cm, Full width figure 15 cm.
Practical size(cm) 72 96 300 600 1200
------------------- ------ ------- ------- ------- --------
8 235.10 313.47 979.60 1959.18 3918.37
15 440.82 587.76 1836.73 3673.47 7346.94
Practical size(cm) 300
----------------- --------------
8 cm * 6 cm 980 * 735
15 cm * 11.25 cm 1837 * 1378
Font logical size in different density and practical size
Practical size(pt) 72 96 300 600 1200
------------------- ------ ------- ------ ------ ---------
1 1 1.33 4.17 8.33 16.67
2 2 2.67 8.33 16.67 33.33
8 8 10.67 33.33 66.67 133.33
16 16 21.33 66.67 133.33 266.67
24 24 32 100 200 400
32 32 42.67 133.33 266.67 533.33
36 36 48 150 300 600
48 48 64 200 400 800
Gnuplot issue
gnuplot term pngcairo set figure density to 72 ppi, when need high density figure, we can set logical size under the expected density directly, and then change density by other program.
But we can not set logical size of font in gnuplot, which must be set in practical size in current density(72 ppi).
So, we achive the logical size by setting practical size under 72 ppi which corresponding the expected logical size under expected density.
For example: achive 300 ppi, 8 pt by setting 33.33 pt under 72 ppi.
Last modified: 2018-10-17
Comments [0]
There is no comments now.