General size of photos:

1, 1 inch: 1* 1.5 inch, 2.5cm*3.5cm

2, 2 inches: 1.5*2 inches, 3.5cm*5.3cm

3. Big 1 inch: 3.3*4.8 inches?

4, 5 inches /3r: 5 * 3.5 inches, 12.7cm*8.9cm?

5.6 inches /4r: 6 * 4 inches,15.2cm *10.2cm.

6.7 inches /5r: 7 * 5 inches, 17.8cm* 12.7cm?

7, 8 inches: 6*8 inches, 15.2cm*20.3cm?

8. Small 12 inch: 8* 12 inch, 20.3cm*30.5cm?

9. 12 inch: 10* 12 inch, 25.4cm*30.5cm

Extended data:

Pixels can be represented by a number, such as a "0.3 megapixel" digital camera with a rating of 300,000 pixels; It can also be represented by a pair of numbers, such as "640x480 display", which means 640 pixels horizontally and 480 pixels vertically (just like VGA display), so its total number is 640x480 = 307,200 pixels.

Graphics of 256 colors or less are usually stored in a block or plane format in a video memory, where each pixel in the video memory is an index value of a color array called a palette. Therefore, these patterns are sometimes called index patterns.

Although there are only 256 colors at a time, these 256 colors are selected from a much larger palette, usually 16 megacolors. You can get the animation effect by changing the color values in the palette. 95(windows95 and 98(windows98' s logos is probably the most famous example of this kind of animation.

For depths exceeding 8 bits, these numbers are the sum of three components (red, green and blue). The depth of 16 is usually divided into 5 bits of red, 5 bits of blue and 6 bits of green (eyes are more sensitive to green).

Effective number of pixels is called effective number of pixels in English. Different from the largest pixel, the effective pixel number refers to the pixel value that really participates in photosensitive imaging. The value of the highest pixel is the real pixel of the photosensitive device, and this data usually includes the non-imaging part of the photosensitive device, while the effective pixel is the value converted under the zoom magnification of the lens. Take Minolta's DiMAGE7 as an example, its CCD pixel is 5.24 million (5.24 megapixels). Because some CCDs do not participate in imaging, the effective pixel is only 4.9 million.

Digital pictures are generally stored in pixels, and each pixel is the smallest unit in digital pictures. The larger the pixel, the larger the area of the picture. To increase the area of a picture, if no more light enters the photosensitive device, the only way is to increase the area of pixels, which may affect the sharpness and clarity of the picture. Therefore, under the condition of constant pixel area, the digital camera can get the largest picture pixel, which is the effective pixel.

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