| Extension | .psb |
| Category | images |
| Description | The PSB (Photoshop Big) file format represents a unique file format, designed exclusively by Adobe for managing large Photoshop files. These files can extend up to 300,000 pixels in any direction. PSB replaces the more common PSD (Photoshop Document) file format, which has a size limit of 30,000 by 30,000 pixels. |
| Technical details | PSB files closely resemble PSD files in structure, including layers, masks, channels, and other Photoshop features. However, they differ significantly in their file header, which uniquely identifies the file type. PSB files also use a 64-bit format, allowing for larger document sizes. PSB files support the full range of color modes in Photoshop, including RGB, CMYK, grayscale, and Lab. Other image editing tools, such as GIMP and PaintShop Pro, can also open and modify PSB files. However, the PSB format might not be compatible with all applications. This is primarily because of its proprietary nature, meaning it's owned and controlled exclusively by Adobe. This often restricts compatibility with other software due to licensing limitations. |
