Relationship between sensor size, pixel, dpi resolution, inch and millimeter

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Although there are many such materials on the Internet , But it's too complicated , Everyone has different opinions , It's confusing , I've summed it up , I don't know ！

1. 1 Inch =25.4mm

2. Sensor size ： The size of the sensor refers to the size of the sensor , Generally, there are two forms of describing size , With IMX386 Take photosensitive element as an example , Its sensor size 1/2.9 Inch , It means that the diagonal of the sensor is 1/2.9 Inch ; It can also be described as sensor size 4.97mm×6.2mm, Refers to the level （ vertical ） Long （ wide ） by 4.97（6.2）mm.

The two representations can be converted through the following figure

3. Pixels ： Refers to the size of the picture , With millet Max2 Mobile phones, for example , The pixels of the rear camera are 4000×3000（12M）, It refers to the level of photos taken （ vertical ） There are... In the direction 4000（3000） Pixel , Pictured above .

4. DPI： Pixels per inch , That is the so-called resolution . With millet Max2 Take the rear camera of mobile phone as an example , Its photos DPI by 72 Pixels / Inch , You can observe it from its attributes . Here's the picture ：

The formula ： The landscape of the image （ vertical ） sizes = Print landscape （ vertical ） The resolution of the （DPI）× Print horizontally （ vertical ） Size

Here is my millet Max2 Photos taken

The attribute screenshot is as follows ：

Physical size of calculator photo ：

The landscape of the image （ vertical ） sizes = Print landscape （ vertical ） The resolution of the （DPI）× Print horizontally （ vertical ） Size

3000/72=41.67 Inch

4000/72=55.56 Inch

We can open it PS, open PS scale , Adjust its units to inches , The screenshot is as follows ：

The result is the same , There are subtle differences , Yes should be in calculation I There will be a rounding process .

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