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105
Adobe Acrobat Help
Working with PDF
Using Help
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Contents
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Index
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105
To extract graphics in JPEG format using the Export command:
1
In the JPEG Options dialog box, choose the compression, format, color space, and
resolution options.
2
For Compression, choose a JPEG quality to balance file size with image quality. For more
information on compression, see
“About methods of compression” on page 51
.
3
For Format, choose Baseline (Standard), Baseline (Optimized), or Progressive:
•
Baseline (Standard) to use a format recognizable to most Web browsers.
•
Baseline (Optimized) to optimize the color quality of the image and produce a slightly
smaller file size. This option is not supported by all Web browsers.
•
Progressive to download the image first as a low-resolution image, with progressive
improvement in quality as downloading continues.
4
For Colorspace, let Acrobat determine the color space automatically or choose Color or
Grayscale. Choose Grayscale, for example, to convert color images in the file to shades of
gray. Or choose Color to override the document’s original color management information
with the default settings.
5
For Resolution, let Acrobat determine the resolution automatically or choose 72, 96,
150, 300, or 600 dpi.
To extract graphics in PNG format using the Export command:
1
In the PNG Options dialog box, choose the interlace, filter, color space, and resolution
options.
2
For Interlace, choose None or Adam7:
•
None to create an image that displays in a Web browser only after downloading is
complete.
•
Adam7 to create an image that displays low-resolution versions in a browser while the
full image file is downloading.
Interlacing can make downloading time seem shorter and assures viewers that
downloading is in progress; however, it increases file size.
3
For Filter, choose None, Sub, Up, Average, Paeth, or Adaptive:
•
None to compress the image without a filter. This option is recommended for indexed-
color and Bitmap-mode images.
•
Sub to optimize the compression of images with even horizontal patterns or blends.
•
Up to optimize the compression of images with even vertical patterns.
•
Average to optimize the compression of low-level noise by averaging the color values
of adjacent pixels.
•
Paeth to optimize the compression of low-level noise by reassigning adjacent color
values.
•
Adaptive to apply the filtering algorithm—Sub, Up, Average, or Paeth—best-suited for
the image. Select Adaptive if you are unsure of which filter to use.
4
For Colorspace, let Acrobat determine the color space or choose Color, Grayscale, or
Monochrome. Choose Grayscale, for example, to convert color images in the file to shades
of gray. Choose Monochrome to convert images to black and white. Or choose Color to
override the document’s original color management information with the default settings.