TIFF Tagged-Image File Format (TIFF, TIF) is used to exchange files between
applications and computer platforms. TIFF is a flexible bitmap image format
supported by virtually all paint, image-editing, and page-layout applications.
Also, virtually all desktop scanners can produce TIFF images. TIFF documents
have a maximum file size of 4 GB. Photoshop CS and later supports large
documents saved in TIFF format. However, most other applications and older
versions of Photoshop do not support documents with file sizes greater than 2
GB.
TIFF format supports CMYK, RGB, Lab, Indexed Color, and Grayscale images with
alpha channels and Bitmap mode images without alpha channels. Photoshop can
save layers in a TIFF file; however, if you open the file in another
application, only the flattened image is visible. Photoshop can also save
notes, transparency, and multiresolution pyramid data in TIFF format.
In Photoshop, TIFF image files have a bit depth of 8, 16, or 32 bits per
channel. You can save high dynamic range images as 32-bits-per-channel TIFF
files.
Large Document Format (PSB) The Large Document Format (PSB) supports documents up to 300,000 pixels in any
dimension. All Photoshop features, such as layers, effects, and filters, are
supported. (With documents larger than 30,000 pixels in width or height, some
plug-in filters are unavailable.)
You can save high dynamic range, 32-bits-per-channel images as PSB files.
Currently, if you save a document in PSB format, it can be opened only in
Photoshop CS or later. Other applications and earlier versions of Photoshop
cannot open documents saved in PSB format. Note: Most other applications and
older versions of Photoshop cannot support documents with file sizes larger
than 2 GB.
