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Adobe Photoshop Help
Saving and Exporting Images
Using Help
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Contents
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Index
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Filmstrip
Filmstrip format is used for RGB animation or movie files created by Adobe Premiere
®
.
If you resize, resample, remove alpha channels, or change the color mode or file format
of a Filmstrip file in Photoshop, you won’t be able to save it back to Filmstrip format.
For further guidelines, see the
Adobe Premiere User Guide
.
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.
JPEG
Joint Photographic Experts Group (JPEG) format is commonly used to display photo-
graphs and other continuous-tone images in hypertext markup language (HTML)
documents over the World Wide Web and other online services. JPEG format supports
CMYK, RGB, and Grayscale color modes, and does not support alpha channels. Unlike GIF
format, JPEG retains all color information in an RGB image but compresses file size by
selectively discarding data.
A JPEG image is automatically decompressed when opened. A higher level of compression
results in lower image quality, and a lower level of compression results in better image
quality. In most cases, the Maximum quality option produces a result indistinguishable
from the original.
PCX
PCX format is commonly used by IBM PC-compatible computers. Most PC software
supports version 5 of PCX format. A standard VGA color palette is used with version 3 files,
which do not support custom color palettes.
PCX format supports RGB, Indexed Color, Grayscale, and Bitmap color modes, and does
not support alpha channels. PCX supports the RLE compression method. Images can have
a bit depth of 1, 4, 8, or 24.
Portable Document Format (PDF) is a flexible, cross-platform, cross-application file format.
Based on the PostScript imaging model, PDF files accurately display and preserve fonts,
page layouts, and both vector and bitmap graphics. In addition, PDF files can contain
electronic document search and navigation features such as electronic links.
Photoshop and ImageReady recognize two types of PDF files: Photoshop PDF files and
Generic PDF files. You can open both types of PDF files; however, you can only save images
to Photoshop PDF format.
Photoshop PDF files
Are created using the Photoshop Save As command. Photoshop
PDF files can contain only a single image.
Photoshop PDF format supports all of the color modes and features that are supported in
standard Photoshop format. Photoshop PDF also supports JPEG and ZIP compression,
except for Bitmap-mode images, which use CCITT Group 4 compression.
