两寸照片的像素是多少？

很多人在申请出国留学、办理身份证明、或者寄送快递时都需要提供一张两寸照片。那么，究竟什么是两寸照片？它的尺寸和像素又是多少呢？

两寸照片是中国通行的一种标准照片尺寸，它的尺寸为25mm×35mm，也就是2.5cm×3.5cm。这个尺寸是根据人的头部大小和照片尺寸比例所确定的。根据这个尺寸，我们可以计算出两寸照片的像素。

要计算两寸照片的像素，我们首先要知道打印机的dpi（dots per inch）或者扫描仪的ppi（pixels per inch）。一般来说，打印机的dpi是300，而扫描仪的ppi可以设置为300或更高。假设我们选择使用300dpi的打印机或者300ppi的扫描仪，那么两寸照片的像素就可以通过以下公式进行计算：像素 = 尺寸（cm） × dpi/2.54

将两寸照片的尺寸代入公式，我们可以得到具体的像素值。像素 = 2.5cm × 300dpi/2.54 = 295像素（宽度）；像素 = 3.5cm × 300dpi/2.54 = 413像素（高度）。所以，两寸照片的像素约为295×413。

然而，需要注意的是，不同地区对两寸照片的尺寸和像素要求可能会有所不同。在国际上，两寸照片的尺寸通常为35mm×45mm，而像素则可以根据打印机或者扫描仪的dpi或ppi进行计算。如果你是在其他国家使用两寸照片，建议先了解当地对照片尺寸和像素的规定。

总结起来，两寸照片的像素取决于打印机的dpi或者扫描仪的ppi。在中国，两寸照片的尺寸为25mm×35mm，像素约为295×413。但在国际上可能有所不同，请根据当地规定进行调整。

How many pixels are there in a two-inch photo?

Many people need to provide a two-inch photo when applying for studying abroad, handling identity documents, or sending parcels. So, what exactly is a two-inch photo? What are its dimensions and pixels?

A two-inch photo is a standard photo size in China, with dimensions of 25mm×35mm, which is equivalent to 2.5cm×3.5cm. This size is determined based on the proportion of the human head size to the photo dimensions. With this dimension, we can calculate the pixels of a two-inch photo.

To calculate the pixels of a two-inch photo, we first need to know the dpi (dots per inch) of a printer or the ppi (pixels per inch) of a scanner. Typically, the dpi of a printer is 300, while the ppi of a scanner can be set to 300 or higher. Assuming we choose to use a printer with 300 dpi or a scanner with 300 ppi, then the pixels of a two-inch photo can be calculated using the following formula: Pixels = Dimensions (cm) × dpi/2.54

By substituting the dimensions of a two-inch photo into the formula, we can obtain the specific pixel values. Pixels = 2.5cm × 300dpi/2.54 = 295 pixels (width); Pixels = 3.5cm × 300dpi/2.54 = 413 pixels (height). Therefore, the pixels of a two-inch photo are approximately 295×413.

However, it is important to note that different regions may have different requirements for the dimensions and pixels of a two-inch photo. Internationally, the dimensions of a two-inch photo are typically 35mm×45mm, and the pixels can be calculated according to the dpi or ppi of the printer or scanner. If you are using a two-inch photo in other countries, it is advisable to first understand the local regulations regarding photo dimensions and pixels.

In summary, the pixels of a two-inch photo depend on the dpi of the printer or the ppi of the scanner. In China, the dimensions of a two-inch photo are 25mm×35mm, with pixels approximately 295×413. However, this may vary internationally, so please adjust according to local requirements.