This is the native image format of Adobe Photoshop, an application for professional image manipulating. The PSD (PhotoShop Document) Format supports color mapped, greyscale and truecolor (RGB or CYMK) images, which are stored using RLE compression.
Quick Info:
Name: Adobe Photoshop Image
Type: Bitmap Image
Extension: PSD
Native Application: Adobe Photoshop
Viewer Application:
Specification: Included in the Photoshop Plug-In SDK (FTP, 5MB)
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Alexander Krauss