PPI有多种含义：PPI = Producer Price Index，生产者物价指数；PPI = Pixels per inch，每英寸所拥有的像素（Pixel）数目；PPI = pyrophosphoric acid，焦磷酸；PPI = process performance index，过程能力指数；PPI = Protein-Protein Interaction，蛋白质互相作用；PPI = PDH Physical Interface，PDH物理接口。
答：像素值，单位面积有像素403个详情>>
