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.

Note: 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

processing.

Digital Negative format (DNG)

Digital Negative (DNG) is a file format that contains the raw image data from a digital camera and metadata that defines what the data means.

DNG, Adobe's publicly available, archival format for camera raw files, is designed to provide compatibility and decrease the current proliferation of

camera raw file formats. The Camera Raw plug-in can save camera raw image data in the DNG format. For more information about the Digital

Negative (DNG) file format, visit www.adobe.com and search on the term "Digital Negative." You'll find comprehensive information and a link to a

user forum.

BMP format

BMP is a standard Windows image format on DOS and Windows-compatible computers. BMP format supports RGB, Indexed Color, Grayscale,

and Bitmap color modes. You can specify either Windows or OS/2® format and a bit depth of 8 bits/channel. For 4-bit and 8-bit images using

Windows format, you can also specify RLE compression.

BMP images are normally written bottom to top; however, you can select the Flip Row Order option to write them from top to bottom. You can also

select an alternate encoding method by clicking Advanced Modes. (Flip Row Order and Advanced Modes are most relevant to game programmers

and others using DirectX®.)

Cineon format

Developed by Kodak, Cineon is a 10-bits-per-channel digital format suitable for electronic composition, manipulation, and enhancement. Using the

Cineon format, you can output back to film with no loss of image quality. The format is used in the Cineon Digital Film System, which transfers

images originated on film to the Cineon format and back to film.

DICOM format

The DICOM (Digital Imaging and Communications in Medicine) format is commonly used for the transfer and storage of medical images, such as

ultrasounds and scans. DICOM files contain both image data and headers, which store information about the patient and the medical image. You

can open, edit, and save DICOM files in Photoshop Extended.

GIF

Graphics Interchange Format (GIF) is the file format commonly used to display indexed-color graphics and images in Hypertext Markup Language

(HTML) documents over the World Wide Web and other online services. GIF is an LZW-compressed format designed to minimize file size and

electronic transfer time. GIF format preserves transparency in indexed-color images; however, it does not support alpha channels.

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Photoshop Raw Format; Digital Negative Format (Dng); Bmp Format; Cineon Format - Adobe Photoshop CS6 User Manual