hey, im trying create a program with java that will watermark an image with a second picture, but i dont want the watermark to be visible, but at the same time, i want to be able to take an image with a watermark and extract the watermark to make sure that it is right. Any pointers that could get me started would be greatly appreciated.
You're a dumb fuck, you want a watermark that is not visible?
hint: that's not a watermark.
That's steganography.
You can either
1) append to the image
2) read about the images format and use it for your evil purposes
...
>_>
Name:
Anonymous2007-05-06 19:52 ID:yHWR1ZBP
You could use the least significant bits of your colour channels to encode your second image. If your main image is varied enough, the effect will be imperceptible.
>>6
its not so much that i need to reinvent the wheel as much as i need to implement said algorithm in a language that i understand. >>3
no evil plans here, just a project for a class
If this is too complex, can anyone give alternative ideas for an an algorithm that is easy, but not too easy to implement, but has practical use?
>>1
just write a brainfuck interpreter and write the code to do the image manipulation in brainfuck. it'll be much easier.
Name:
Anon2007-05-06 23:28 ID:0fQWsS+8
>>11
hey thanks, maybe then ill go rewrite all of the drivers for my linux partition for fun.
Name:
Anon2007-05-07 9:15 ID:US8qC7vO
>>3
the purpose of having a watermark that is not visible is that in case some fag site like ebaums takes an image and puts their watermark on the front, i could prove that i was the original creator by having my sig in the picture after i take the two apart.
Name:
Anonymous2007-05-07 10:13 ID:6WtueWAl
>>13 >>3 HERE
PROTIP:
READ THE FILE FORMATS.
IT'S POSSIBLE TO PUT COMMENTS AT YOUR GODAMN IMAGES.
also it is possible to append text to the image without destroying it.
Are you on *nix ? try this
echo leethacker >> image.jpg
strings image.jpg | tail
Name:
Anonymous2007-05-07 10:21 ID:BRWettan
>>14
somehow i woudln't expect the appended string or comment to be preserved when someone edits the image and saves it as jpeg again
Name:
Anonymous2007-05-07 10:32 ID:6WtueWAl
>>15
you cannot hide a message if someone edits your image you FUCKING IDIOT.
GOD.FUCKING.DAMN.
DO YOU EVEN KNOW HOW IMAGE SOFTWARE WORKS? IMAGE SOFTWARE KEEPS ONLY THE VISIBL--- GODAMN FUCK THAT GO FUCK YOURSELF
Name:
Anonymous2007-05-07 11:53 ID:6w/+1ku3
Using JAVA you say? Well, that makes it all NEXT TO TRIVIAL. I've been to a JAVA class, you see! And in that JAVA class (I just made a clever, deep, involved PUNE, or PLAY ON WORDS, there!) they taught us that JAVA can solve all problems with but seven or eight hundred lines of code!
So your problem is virtually solved already, thanks to JAVA!