The size of an inch photo is usually 25mm x 35mm. This size is stipulated by national standards and is suitable for all kinds of documents, certificates, resumes and other occasions.

In addition to the size, there are other details that need attention in an inch photo. For example, the background color of photos is usually white or light to highlight the image of people. At the same time, we should also pay attention to the picture quality, which should be clear and natural, not blurred or distorted.

The resolution of one-inch photos is also a problem that needs attention. Generally speaking, the resolution of an ordinary one-inch photo is 300dpi, which means 300 pixels per inch. This resolution ensures that photos will not be distorted or blurred when printed or enlarged. However, if you need to use photos in high-definition occasions, such as high-definition TV and advertisements. You need a higher resolution.

In addition to size and resolution, the format of one-inch photos is usually JPEG or PNG. Both formats can ensure the quality and clarity of photos, and are also convenient for storage and transmission.

In a word, one-inch photo is a common photo size, which is widely used in certificates, certificates, resumes and other occasions. When taking an inch photo, we need to pay attention to the size, background color, image quality, resolution and format of the photo to ensure that the quality and clarity of the photo meet the requirements. At the same time, it is necessary to choose the appropriate one-inch photo size and format according to different occasions, which is convenient for use and transmission.

Finally, it should be noted that with the development of science and technology and the change of people's aesthetics, the size and format of one-inch photos may also be adjusted. Therefore, when taking a one-inch photo, it is best to understand the relevant standards and requirements first to ensure that the quality and applicability of the photo meet the requirements.