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450
Adobe Photoshop Help
Saving and Exporting Images
Using Help
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Contents
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450
•
Interlaced displays low-resolution versions of the image in a browser as the file
downloads. Interlacing makes download time seem shorter, but it also increases
file size.
Saving files in JPEG format (Photoshop)
You can use the Save As command to save CMYK, RGB, and grayscale images in JPEG
format. JPEG compresses file size by selectively discarding data. (See
“About file
compression” on page 453
.)
Note:
You can also save an image as one or more JPEG files using the Save for Web
command (Photoshop) or the Save Optimized command (ImageReady). For more infor-
mation on optimizing images, see
“Optimizing images” on page 415
.
To save a file in JPEG format:
1
Save the artwork, and choose JPEG from the Format menu. (See
“Saving files” on
page 446
.)
2
In the JPEG Options dialog box, select the options you want, and click OK.
Matte
If the image contains transparency, select a Matte color to simulate the
appearance of background transparency.
Image Options
To specify the 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.
Format Options
Select Baseline (“Standard”) to use a format recognized by most Web
browsers, Baseline Optimized for optimized color and a slightly smaller file size,
Progressive to display a series of increasingly detailed scans (you specify how many) as the
image downloads. Baseline Optimized and Progressive JPEG images are not supported by
all Web browsers.
Size
To view the estimated download time, select a modem speed. (The Size preview is
only available when Preview is selected.)
Note:
Some applications may not be able to read a CMYK file saved in JPEG format. In
addition, if you find that a Java application cannot read your JPEG file (in any color mode),
try saving the file without a thumbnail preview.
Saving files in Photoshop PDF format (Photoshop)
You can use the Save As command to save RGB, indexed-color, CMYK, grayscale, Bitmap-
mode, Lab color, and duotone images in Photoshop PDF format.
To save a file in Photoshop PDF format:
1
Save the artwork, and choose Photoshop PDF from the Format menu. (See
“Saving files”
on page 446
.)
2
In the PDF Options dialog box, select the options you want, and click OK.
Encoding
Determines the compression method. (See
“About file compression” on
page 453
.)
Note:
Bitmap-mode images are automatically encoded using CCITT compression—
the PDF Options dialog box does not appear.
Save Transparency
Preserves transparency when the file is opened in another appli-
cation. (Transparency is always preserved when the file is reopened in Photoshop or
ImageReady.) This option is not available if the file contains a spot color channel.
