The default file extension for Photoshop files is. PSD stands for "Photoshop document". PSD files store images and support most of the image options available in Photoshop.

These include layer mask, transparency, text, alpha channels and spot colors, clipping paths and bi-tone settings. This is different from many other file formats (for example. JPG or. GIF) Restrict content to provide simplified and predictable functionality. The maximum height and width of PSD file is 30,000 pixels, and the length is limited to 2gb.

Photoshop files sometimes have file extensions. PSB stands for "Photoshop Big" (also known as "large document format"). The PSB file extends the PSD file format, increasing the maximum height and width to 300,000 pixels, and increasing the length limit to about 4? Ibit

Obviously, the size limit is arbitrarily selected by Adobe, not based on the arithmetic constraint of the computer (because it is 30,000, it is not close to the power of 2), but for the convenience of software testing. Record PSD and PSB formats.

Extended data

Characteristics of psd format

PSD format will compress files to reduce disk space when saving, but it contains more image data information (such as layers, channels, clipping paths, reference lines, etc.). ), so it is much larger than other image files. Because PSD file retains all the original image data information, it is more convenient to modify.

When saving an image in PSD format, the image will not be compressed. When there are many layers, it will take up a lot of hard disk space. After the image is made, it is best to save a copy of PSD file in addition to the common format until it is confirmed that the image does not need to be edited again in Photoshop. ?

Reference source? Baidu encyclopedia -psd