secheese <> writes:
> On Sat, 13 Nov 2004 06:52:02 GMT, secheese <>
> wrote:
>
> >Can anyone recommend a freeware digital watermarking utility? Or
> >something similar?
>
> Let me clarify my question. The type of digital watermark I'm talkin'
> about, are the ones that get encoded within the image, but are not
> visible on the image. Essentially, I'm looking for a freeware program
> that does something like this program:
>
> http://www.digimarc.com/watermark/mypicturemarc/
The ImageMagick tools (
http://www.imagemagick.org) have a -comment option to
add a text message (which I use for adding my copyright):
-comment <string>
annotate an image with a comment
Use this option to assign a specific comment to the image, when
writing to an image format that supports comments. You can
include the image filename, type, width, height, or other image
attribute by embedding special format characters listed under
the -format option. The comment is not drawn on the image, but
is embedded in the image datastream via a "Comment" tag or simi-
lar mechanism. If you want the comment to be visible on the
image itself, use the -draw option.
For example,
-comment "%m:%f %wx%h"
produces an image comment of MIFF:bird.miff 512x480 for an image
titled bird.miff and whose width is 512 and height is 480.
If the first character of string is @, the image comment is read
from a file titled by the remaining characters in the string.
Also there is the following option:
-stegano <offset>
hide watermark within an image
Use an offset to start the image hiding some number of pixels
from the beginning of the image. Note this offset and the image
size. You will need this information to recover the stegano-
graphic image (e.g. display -size 320x256+35 stegano:image.png).
--
Michael Meissner
email:
http://www.the-meissners.org
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