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·¢ÐÅÈË: killest (victor), ÐÅÇø: Graphics
±ê Ìâ: PHOTOSHOP(7)-Using the Digimarc filters
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Using the Digimarc filters
the Digimarc filters let you add copyright
and authorship information to images in
Photoshop and notify users that an image is
copyright- protected via a digital watermark that
uses Digimarc PictureMarc ™ technology. The
watermark- digital code added as noise to the
image's lightness channel-can be virtually invisi-ble,
and does not affect image integrity. Most filter
and image operations-including color correc-tions,
printing, and cropping-don't affect the
watermark.
To use the technology, you first register for a fee
with Digimarc Corporation-which maintains a
database of artists, designers, and photographers
and their contact information-to get a unique
creator ID. You can then embed the creator ID in
your images along with information on the image
use such as royalty-free or restricted use using the
Embed Watermark filter. Copying an image with
an embedded watermark also copies the water-mark
and any information associated with it.
If you install the Detect Watermark filter, Photo-shop
will automatically scan for a watermark on
opening or acquiring an image. If the filter detects
a watermark, a copyright (@) symbol appears in
the image's title bar and status bar, to alert users to
use the Read Watermark filter to determine the
image's owner.
Installing Adobe Photoshop 4.0 using the Easy
Install option (Macintosh) or Typical (Windows)
option installs the Embed Watermark and Read
Watermark filters automatically in the Photoshop
Plug-ins folder. You must install the Detect
Watermark filter manually, by copying the plug-in
from the Application CD-ROM (located in
the Other Goodies (Macintosh) or Goodies
(Windows)/Optional plugins/Digimarc/Detect
Watermark folder) to the Photoshop Plug-ins
folder. For more information about the filters, see
the Read Me file in the Digimarc folder.
Note: To use the Digimarc filter on a 68000-based
Macintosh computer, you must have a floating point
unit (FPU) installed.
To embed a watermark:
1 Open the image you want to watermark. You
can embed only one watermark in an image. The
Embed Watermark filter won't work on an image
that has been previously marked.
If you're working with a layered image, you should
flatten the image before marking it. If you do not
flatten the image, the filter applies the watermark
to the current layer.
Note: You can add a watermark to an indexed color
image by first converting the image to RGB mode,
embedding the watermark, and then converting the
image back to indexed color mode. However, the
results may be inconsistent. To make sure that the
watermark was embedded, run the Digimarc > Read
Watermark filter.
2 Choose Filter > Digimarc > Embed Watermark.
3 If you are using the filter for the first time, click
the Personalize button. Get a creator ID by clicking
Register to launch your Web browser and visit the
Digimarc Web site at www.digimarc.com, or by
contacting Digimarc at the telephone number
listed in the dialog box. Enter the ID number in the
Creator ID text box, and click OK.
(Once you have entered a Creator ID, the Person-alize
button becomes a Change button, allowing
you to enter a new Creator ID.)
4 For Type of Use, choose Restricted to limit the
use, or Royalty Free for unlimited free use.
5 Check the Adult Content option to label the
image contents for adults only.
(Within Photoshop, this option does not limit
access to adult-only images, but future versions of
other applications may limit their display.)
6 For Watermark Durability, drag the slider or
enter a value (where values of 1 or 2 are intended
for high-end printing, and values of 3 and 4 are
best for multimedia or online display) as follows: Choose 1 to produce near
invisible water-marking
for screen or print output and to embed
picture usage and artist information only. Choose 2 for all general-purpose
printing needs.
This setting has been optimized for 133 lines per
inch (lpi) to 155 lpi output for halftone printing. Choose 3 to add a more
visible grain to the
image than a value of 2, and to retain the water-mark
over various bit depths of an image. Choose 4 for the most visible and
durable water-mark.
You should first apply this setting to a proxy
or duplicate of the image first, to determine
whether the watermark quality is appropriate.
Low values are less visible in an image, but less
durable, and may be damaged by applying filters
or by performing some image-editing operations,
printing, and scanning operations. High values are
more durable but may display some visible noise
in the image.
7 Click OK.
To read a watermark:
1 Choose Filter > Digimarc > Read Watermark. If
the filter finds a watermark, a dialog box displays
the creator ID, type of use, and whether the image
has adult content.
Note: A message may appear that " watermark
was found but not readable" if you're reading a
scanned image from an inkjet printer or if you're
reading a small selection of an image. This mes-sage
means that the PictureMarc technology was
unable to decode the creator ID and usage infor-mation.
For more information, contact Digimarc
or visit its home page at www.digimarc.com.
2 Click OK, or for more information choose from
the following options: If you have a Web browser installed, click
Web Lookup to launch the browser, link to the
Digimarc Web site, and display the artist' contact
information corresponding to the creator ID. Call the phone number listed in the Watermark
Information dialog box to get information faxed
back to you.
--
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