Adobe Photoshop CC 2014 v.14.xx - Manual (Page 846)

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versions of Photoshop change the behavior of some features. Including the composite also makes the image much faster to load and use in
applications other than Photoshop, and may sometimes be required to make the image readable in other applications.
16-bits-per-channel and high dynamic range 32-bits-per-channel images can be saved as PSD files.
Photoshop 2.0 format
(Mac OS) You can use this format to open an image in Photoshop 2.0 or to export an image to an application supporting only Photoshop 2.0 files.
Saving in Photoshop 2.0 format flattens your image and discards layer information.
Photoshop DCS 1.0 and 2.0 formats
Desktop Color Separations (DCS) format is a version of the standard EPS format that lets you save color separations of CMYK images. You can
use DCS 2.0 format to export images containing spot channels. To print DCS files, you must use a PostScript printer.
Photoshop EPS format
Encapsulated PostScript (EPS) language file format can contain both vector and bitmap graphics and is supported by virtually all graphics,
illustration, and page-layout programs. EPS format is used to transfer PostScript artwork between applications. When you open an EPS file
containing vector graphics, Photoshop rasterizes the image, converting the vector graphics to pixels.
EPS format supports Lab, CMYK, RGB, Indexed Color, Duotone, Grayscale, and Bitmap color modes, and does not support alpha channels. EPS
does support clipping paths. Desktop Color Separations (DCS) format, a version of the standard EPS format, lets you save color separations of
CMYK images. You use DCS 2.0 format to export images containing spot channels. To print EPS files, you must use a PostScript printer.
Photoshop uses the EPS TIFF and EPS PICT formats to let you open images saved in file formats that create previews but are not supported by
Photoshop (such as QuarkXPress®). You can edit and use an opened preview image just as any other low-resolution file. An EPS PICT preview is
available only in Mac OS.
EPS TIFF format and EPS PICT format are more relevant to earlier versions of Photoshop. The current version of Photoshop includes
rasterization features for opening files that include vector data.
Photoshop Raw format
The Photoshop Raw format is a flexible file format for transferring images between applications and computer platforms. This format supports
CMYK, RGB, and grayscale images with alpha channels, and multichannel and Lab images without alpha channels. Documents saved in the
Photoshop Raw format can be of any pixel or file size, but they cannot contain layers.
The Photoshop Raw format consists of a stream of bytes describing the color information in the image. Each pixel is described in binary format,
with 0 representing black and 255 white (for images with 16-bit channels, the white value is 65535). Photoshop designates the number of channels
needed to describe the image, plus any additional channels in the image. You can specify the file extension (Windows), file type (Mac OS), file
creator (Mac OS), and header information.
In Mac OS, the file type is generally a four-character ID that identifies the file—for example, TEXT identifies the file as an ASCII text file. The file
creator is also generally a four-character ID. Most Mac OS applications have a unique file creator ID that is registered with the Apple Computer
Developer Services group.
The Header parameter specifies how many bytes of information appear in the file before actual image information begins. This value determines
the number of zeroes inserted at the beginning of the file as placeholders. By default, there is no header (header size = 0). You can enter a header
when you open the file in Raw format. You can also save the file without a header and then use a file-editing program, such as HEdit (Windows)
or Norton Utilities® (Mac OS), to replace the zeroes with header information.
You can save the image in an interleaved or non-interleaved format. If you choose interleaved, the color values (red, green, and blue, for example)
are stored sequentially. Your choice depends on requirements of the application that will open the file.
A Photoshop Raw image is not in the same file format as a camera raw image file from a digital camera. A camera raw image file is in a
camera-specific proprietary format that is essentially a “digital negative,” with no filtering, white balance adjustments, or other in-camera
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