Saving files in TIFF format

TIFF is a flexible bitmap image format supported by virtually all paint, image-editing, and page-layout applications.

To save a file in TIFF format (Photoshop):

1Save the artwork, and choose TIFF from the Format menu. (See “Saving files” on page 446.)

2In the TIFF Options dialog box, select the options you want, and click OK.

Image Compression Specifies a method for compressing the composite image data. (See “About file compression” on page 453.)

Byte Order Photoshop and most recent applications can read files using either byte order. However, if you don’t know what kind of program the file may be opened in, select the platform on which the file will be read.

Save Image Pyramid Preserves multiresolution information. Photoshop does not provide options for opening multiresolution files; the image opens at the highest resolution within the file. However, Adobe InDesign and some image servers provide support for opening multiresolution formats.

Save Transparency Preserves transparency as an additional alpha channel when the file is opened in another application. (Transparency is always preserved when the file is reopened in Photoshop or ImageReady.)

Layer Compression Specifies a method for compressing data for pixels in layers (as opposed to composite data). Many applications cannot read layer data and will skip over it when opening a TIFF file. Photoshop, however, can read layer data in TIFF files. Although files that include layer data are larger than those that don’t, saving layer data alleviates the need to save and manage a separate PSD file to hold the layer data. For more information on RLE and ZIP compression, see “About file compression” on page 453. Choose Discard Layers and Save a Copy to flatten the image.

Note: To have Photoshop prompt you before saving an image with multiple layers, select Ask Before Saving Layered TIFF Files in the File Handling section of the Preferences dialog box.

To save a file in TIFF format (ImageReady):

1Choose File > Export Original, and choose TIFF from the format list.

2Specify a filename and location, and click Save.

3Select a compression method, and click OK. (See “About file compression” on page 453.)

Exporting images in ZoomView format (Photoshop)

ZoomView is a format for delivering high-resolution images over the Web. With the Viewpoint Media Player, users can zoom into or out of an image and pan the image to see its various parts.

When you export an image in ZoomView format, Photoshop creates the following files:

•An MTX file that defines the image to be displayed.

•An HTML file that loads the Viewpoint Media Player and points to the MTX file.

LZW (Lemple-Zif-Welch) Lossless compression; supported by TIFF, PDF, GIF, and PostScript language file formats. Most useful for images with large areas of single color.

JPEG (Joint Photographic Experts Group) Lossy compression; supported by JPEG, TIFF, PDF, and PostScript language file formats. Recommended for continuous-tone images, such as photographs. To specify image quality, choose an option from the Quality menu, drag the Quality pop-up slider, or enter a value between 0 and 13 in the Quality text box. For the best printed results, choose maximum-quality compression. JPEG files can be printed only on Level 2 (or later) PostScript printers and may not separate into individual plates.

CCITT A family of lossless compression techniques for black-and-white images; supported by the PDF and PostScript language file formats. (CCITT is an abbreviation for the French spelling of International Telegraph and Telekeyed Consultive Committee.)

ZIP Lossless compression; supported by PDF and TIFF file formats. Like LZW, ZIP compression is most effective for images that contain large areas of single color.

PackBits (ImageReady) Lossless compression that uses a run-length compression scheme; supported by the TIFF file format in ImageReady only.

Photoshop format

Photoshop format (PSD) is the default file format and the only format that supports all Photoshop features. When saving a PSD file for use in a previous version of Photoshop or ImageReady, you can set a preference to maximize file compatibility.

To maximize compatibility with previous versions of Photoshop and with other applications (Photoshop):

1 Do one of the following:

• In Windows and Mac OS 9.x, choose Edit > Preferences > File Handling.

• In Mac OS X, choose Photoshop > Preferences > File Handling.

2 Select Always Maximize Compatibility for Photoshop (PSD) Files.

If you edit or save an image using an earlier version of Photoshop, unsupported features are discarded. Keep in mind the following features when working with earlier versions of Photoshop:

•Photoshop 7.0 introduces the Linear Burn, Linear Dodge, Vivid Light, Linear Light, and Pin Light blending modes and the Layer Mask Hides Effect and Vector Mask Hides Effect advanced blending options.

•Photoshop 6.0 introduced layer sets, layer color coding, layer clipping paths, fill layers, layer styles, editable type, and advanced type formatting. Photoshop 6.0 also added new layer effects.

•Photoshop 5.0 introduced layer effects; however, effects added in later versions of Photoshop are not supported. Photoshop 5.0 also introduced color samplers, spot channels, and embedded ICC profiles.

•Photoshop 4.0 introduced adjustment layers and guides.

Photoshop 2.0 (Photoshop)

(Mac OS) You can use this format to open an image in version 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.

AVI (ImageReady)

Audio Video Interleave (AVI) format is the standard Windows format for audio/video data.

Note: In Windows, AVI format is visible in the Files of Type pop-up menu only when QuickTime is installed on your computer.

BMP

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 for the image. 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.)

Photoshop EPS

Encapsulated PostScript (EPS) language file format can contain both vector and bitmap graphics and is supported by virtually all graphic, illustration, and page-layout programs. EPS format is used to transfer PostScript-language 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 DCS 1.0 and 2.0 (Photoshop)

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.

EPS TIFF or EPS PICT Preview (Photoshop)

These formats let you open images saved in file formats that create previews but are not supported by Adobe Photoshop (such as QuarkXPress®). An opened preview image can be edited and used like any other low-resolution file. EPS PICT Preview is available only in Mac OS.

Note: EPS TIFF format and EPS PICT format were more relevant for use in earlier versions of Photoshop. The current version of Photoshop includes rasterization features for opening files that include vector data.