无人机8k比较于多少万像素

Bullshit!First,D for DOTS not double!!!D是dots,不是double
在这里有一个公式：尺寸*DPI=像素
DPI是量度单位，英文全写是dots per inch，用于打印机，指每英吋能印出的点的数目。

打印机的分辨率的dpi越高，印出的图象越清晰。打印机通常可以调较分辨率。例如撞针打印机，分辨率通常是60至90 dpi。喷墨打印机则可达1200 dpi，甚至9600 dpi。激光打印机则有600至1200 dpi。

因为打印机的色彩不多，打印机的dpi应该大大大于显示器的ppi，才能有差不多的图象质素。大部分显示器每像素每种原色都可以有256个层次，合起来则有2563种颜色。而打印机则仅有16色左右，因此打印机常常利用中间色或抖动等方法来制造更多颜色的效果，故此其分辨率相当重要。

除了dpi外，也有建议使用dpcm。dpcm和dpi都纳入了CSS3的方案内

扫瞄仪的取样分辨率有时会用dpi来量度，但更好的做法是用spi。
原文:Dots per inch (DPI) is a measure of printing resolution, in particular the number of individual dots of ink a printer or toner can produce within a linear one-inch (2.54 cm) space.
Up to a point, printers with higher DPI produce clearer and more detailed output. A printer does not necessarily have a single DPI measurement; it is dependent on the print mode, which is usually influenced by driver settings. The range of DPI supported by a printer is most dependent on the print head technology it uses. A dot matrix printer, for example, applies ink via tiny rods striking an ink ribbon, and has a relatively low resolution, typically in the range of 60 to 90 DPI. An inkjet printer sprays ink through tiny nozzles, and is typically capable of 360 DPI. A laser printer applies toner through a controlled electrostatic charge, and may be in the range of 600 to 1800 DPI.

The DPI measurement of a printer often needs to be considerably higher than the pixels per inch (PPI) measurement of a video display in order to produce similar-quality output. This is due to the limited range of colors for each dot typically available on a printer. At each dot position, the simplest type of color printer can print no dot, or a dot consisting of a fixed volume of ink in each of four color channels (typically CMYK with cyan, magenta, yellow and black ink). Contrast this to a standard sRGB monitor where each pixel produces 256 intensities of light in each of three channels (RGB) to additively create 2563 = 16,777,216 colors. The number of unique colors for a printed CMYK dot from this simplest type of inkjet printer is only 8 since no colored ink is visible when printed on black and black is used instead of CMY:

参考资料: Encyclopedia

是300万像素,后面的D其实是英文double的缩写
所以是150万*2=300万像素

150万像素！

3MP就是300万像素2560×1440（约369万像素）。4K分辨率即4096×2160(880万像素)。

一点关系都没有
150DPI是一英寸上有150个点

dpi是指单位面积内像素的多少,也就是扫描精度.所以应该是150万像素啊`

dpi是指每英寸的像素，也就是扫描精度。国际上都是计算一平方英寸面积内像素的多少。dpi越小，扫描的清晰度越低，由于受网络传输速度的影响，web上使用的图片都是72dpi，但是冲洗照片不能使用这个参数，必须是300dpi或者更高350dpi。例如要冲洗4*6英寸的照片，扫描精度必须是300dpi，那么文件尺寸应该是(4*300)*(6*300)=1200像素*1800像素。