转换px为mm [英] Convert px to mm

问题描述

我正在在线创建名片制造商，到目前为止，直到我开始进行名片渲染为止，一切都很容易.在我的HTML文档中，我有:

width = 517px，等于90mm
高度= 287像素，等于50毫米

根据Photoshop 90mm -> 255px ，所以我需要以某种方式将 517px 转换为 255px ./p>

经过一些谷歌搜索的最佳解决方案后，到目前为止我想到的是(517/5.7)* 3 ，这使我获得了 272 ，而且还没有正确的答案.

任何建议都会有很大帮助:)

P.S我正在使用 php GD .

解决方案

像素与物理测量之间的相关性完全取决于显示器以及每(平方)毫米有多少个物理像素.72ppi(每英寸像素数)曾经是一种典型的分辨率，但是在许多设备上像素密度却在增加，这不再是给定的.

根本没有标准公式.

I am creating business card maker online, now so far everything was easy until i came to card rendering. In my html document i have:

width = 517px which is equals to 90mm
height = 287px which is equals to 50mm

And according to Photoshop 90mm -> 255px so I need to somehow convert 517px to 255px.

After some googling best solution i came up with so far is (517 / 5.7) * 3 which gives me 272 and it's far from correct answer.

Any suggestions would help a lot :)

P.S I am using php GD.

解决方案

The correlation between pixels and physical measurements depends entirely on the display and how many physical pixels there are per (square) millimeter. 72ppi (pixels per inch) used to be a typical resolution, but with pixel density increasing across many devices, that's not a given anymore.

There's simply no standard formula.

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