Two types of resolution conversion in Photoshop

Two resolutions:

1. 72 pixels/inch = 28.346 pixels/centimeter
2. 300 pixels/inch = 118.11 pixels/centimeter
1 CM = 0.3937 inch
1 inch = 2.54 cm
Compare with common 1024 pixels:

1. 1024 pixels = 3.413 inch = 8.67 cm (300 pixels/inch DPI ≈ 0.003333 inch per pixel)

So the centimeter size of 1024 pixels is: 1024*0.003333*2.54

2. 1024 pixels = 14.222 inch = 36.12 cm (72 pixels/inch DPI ≈ 0.013889 inch per pixel)

So the centimeter size of 1024 pixels is: 1024*0.013889*2.54

When raising the resolution, we need to understand two concepts: image resolution and output resolution. The image resolution is the number of pixels per inch, in the unit of PPI, the image resolution is often expressed as the total number of pixels in each direction, such as 640x480 pixels and 1280x960 pixels. What determines the image output quality is the image output resolution, which describes the points (DPI) that can be generated per inch when the device outputs the image, in DPI, the two are correlated but not always equal.