PSD

PSD (Photoshop Document)is a bitmap file type. It is the main image format for Photoshop. Its a lossless, uncompressed format. It supports: layers, vector paths, transparency. This allows to edit the file in a different program without losing for example layer data.

A PSD file can be opened by other programs than photoshop, for example:

PSD files can have a max resolution of 30'000px and max size of 2 GB An alternative which supports even bigger files is PSB (Photoshop Big). These files can have a max resolution of 300'000px and max size of 4 billion GB

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