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To put it simply, what we usually call is the number of photoelectric sensing elements on the CCD. After a photosensitive element is subjected to sensitization, photoelectric signal conversion, A/D conversion, etc., a point is formed on the output photo. Zooming in on the image several times will reveal that these continuous tones are made up of many small squares with similar colors. These small squares are the smallest unit of pixels (Pixel) that make up the image.
Pixels are divided into CCD pixels and effective pixels. Most of the digital cameras on the market today are pixels of CCD instead of effective pixels. PS: 1/1.8 CCD is better than 1/2.7 CCD
2. What is the resolution?
The so-called "resolution" refers to the number of pixels expressed or captured per unit length.
We usually say that the maximum resolution of the digital camera output photo refers to the image resolution, the unit is ppi (PixelperInch), in addition to: print resolution, the unit is dpi (dotperinch) display resolution, is the Windows desktop size. Common settings are 640x480, 800x600, 1024x768...etc. Screen font resolution: PC font resolution is 96dpi, Mac font resolution is 72dpi. Of course there will be resolutions for other output devices.
3, image resolution and pixel relationship
As mentioned above, the pixel is divided into effective pixels and a CCD pixel of 2 megapixels. The maximum image resolution is 1600 × 1200 = 1.92 million pixels, that is, the actual effective pixels are 1.92 million. The calculation methods of other pixel-level digital cameras are similar. It can be seen that the higher the pixel, the higher the image resolution of the maximum output.
4, print resolution and pixel relationship
Printing resolution, related to the size of our print photos, the calculation method is also very simple: 2 million pixel digital camera, effective pixels 1.92 million, maximum output 1600 × 1200 photos, width: 1600Pixels / 300dpi = 5.3 "high: 1200Pixels /300dpi=4" means that if you print with 300dpi output resolution, you can print up to 5.3 × 4 inches of photos, and usually the size of the photo is: 5 inches: 5 × 3.5, 6 inches: 6 × 41, it is obvious It can be seen that 2 million pixels can print a maximum of 5 inches of photos with a 300dpi effect.
By the way: the maximum resolution that the human eye can distinguish is 300dpi. Exceeding this resolution, the human eye can't see the difference, which means that 300dpi and 600dpi are indistinguishable from the human eye, so the current print The maximum design output resolution of the device is 300dpi. Of course, everyone's requirements for clarity are different. Generally speaking, 200dpi can satisfy most people.
Discuss camera pixel and resolution conversion
[ Huaqiang Security Network News ] Today, I will introduce the conversion of camera pixels and resolution. I often have friends asking how many resolutions are 2 million HD network machines, or how many megapixels is 1600*1200? I just found an article like this on the Internet today, I hope to help everyone. 1. What is a pixel?