一寸照片尺寸是多少？

在现如今的社交媒体时代，拍照已经成为人们生活中不可或缺的一部分。无论是朋友聚会、旅行还是重要场合的纪念，我们总是喜欢留下美好的瞬间。当我们要打印照片或申请各种证件时，照片尺寸成为一个重要的问题。其中，一寸照片尺寸最为常见和普遍。那么，一寸照片尺寸到底是多少呢？

根据国际标准ISO/IEC 19794-5，一寸照片的尺寸是2.5厘米（宽）× 3.5厘米（高）。这一规格广泛应用于护照、身份证、驾驶执照等证件照片。一寸照片的长宽比为5:7，与标准的相框尺寸相符。因此，如果您需要打印一寸照片，可以根据这一尺寸进行裁剪或者在线照片编辑工具进行调整。

拍摄一寸照片时，要特别注意以下几点：首先，确保头像清晰可见，面部特征完整；其次，保持背景简洁、单色，常用的背景颜色为纯白色。还要注意光线的均匀分布和适当的亮度，以确保照片质量的稳定和可识别性。

通过掌握一寸照片尺寸，我们可以轻松地处理各种证件照片的要求。这使得申请护照、身份证或其他证件变得更加方便快捷。无论是在线打印服务还是自行裁剪，只要按照正确的尺寸进行处理，我们就能够获得符合要求的一寸照片。

In English:

What is the size of a one-inch photo?

In today's era of social media, taking photos has become an indispensable part of our lives. Whether it's a gathering with friends, a trip, or a memorable occasion, we always like to capture those beautiful moments. When we need to print a photo or apply for various documents, the photo size becomes an important issue. Among them, the size of a one-inch photo is the most common and universal. So, what exactly is the size of a one-inch photo?

According to the international standard ISO/IEC 19794-5, the size of a one-inch photo is 2.5 cm (width) × 3.5 cm (height). This specification is widely used for passport photos, identity cards, driving licenses, and other ID photos. The aspect ratio of a one-inch photo is 5:7, matching the standard photo frame size. Therefore, if you need to print a one-inch photo, you can crop it according to this size or adjust it using online photo editing tools.

When taking a one-inch photo, it is important to pay attention to the following points: firstly, ensure that the portrait is clear and facial features are complete; secondly, keep the background simple and monochromatic, with pure white being the commonly used background color. Also, pay attention to even distribution of light and appropriate brightness to ensure stable photo quality and recognizability.

By understanding the size of a one-inch photo, we can easily handle the requirements of various ID photos. This makes applying for a passport, ID card, or other documents more convenient and efficient. Whether using online printing services or self-cropping, as long as we process the photos according to the correct size, we can obtain one-inch photos that meet the requirements.