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Relationship between sensor size, pixel, dpi resolution, inch and millimeter
2022-07-01 17:49:00 【Full stack programmer webmaster】
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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