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  1. #226
    eldavo1's Avatar Member
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    Originally Posted by _Mike View Post
    Offset from center of image.
    Sweet. Cropped the 1024*768 to this: https://i.imgur.com/XHLRX.png

    Looking inside your screenshots
  2. #227
    Luckdogg2211's Avatar Banned
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    yup thats it

  3. #228
    Thundathigh's Avatar Master Sergeant
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    Pure black screens have no changes in them at all, no opacity or RGB changes... so just keep it in mind if you're writing anything to use an actual SS that the watermark is removing some of the RGB values.
    Last edited by Thundathigh; 09-13-2012 at 05:16 AM.

  4. #229
    Sendatsu's Avatar Contributor
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    Originally Posted by eldavo1 View Post
    Sweet. Cropped the 1024*768 to this: https://i.imgur.com/XHLRX.png
    I think you missed some parts from the left? Can you check please? Otherwise well done, keep up! (I'll rep everyone as soon as it lets me )
    Last edited by Sendatsu; 09-13-2012 at 06:12 AM.

  5. #230
    Sendatsu's Avatar Contributor
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    Originally Posted by Thundathigh View Post
    Pure black screens have no changes in them at all, no opacity or RGB changes... so just keep it in mind if you're writing anything to use an actual SS that the watermark is removing some of the RGB values.
    I still believe it has something to do with luminance. They even mention it in their patents: Patent US7822969 - Watermark systems and methods - Google Patents

    Based on some code I found on the Web, you can use:

    Y = 0.2126*R + 0.7152*G + 0.0722*B

    if Y < 128 then black else white


    Can someone try this? Thank you

  6. #231
    eldavo1's Avatar Member
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    Originally Posted by Sendatsu View Post
    I think you missed some parts from the left? Can you check please? Otherwise well done, keep up! (I'll rep everyone as soon as it lets me )
    Exact copy & paste of what mike gave me. I'll try fine tuning it after I finish my work...

    Originally Posted by Sendatsu View Post
    I still believe it has something to do with luminance. They even mention it in their patents: Patent US7822969 - Watermark systems and methods - Google Patents

    Based on some code I found on the Web, you can use:

    Y = 0.2126*R + 0.7152*G + 0.0722*B

    if Y < 128 then black else white


    Can someone try this? Thank you
    Already tried, thats what my patch does after it crops it and tries to isolate it into a black & white pattern. It seems to leave some parts out when converting the colors from sharpened to pure.

    Code:
    // look at every pixel in the rectangle
                for (Int32 xx = rectangle.X; xx < rectangle.X + rectangle.Width; xx+=4)
                {
                    for (Int32 yy = rectangle.Y; yy < rectangle.Y + rectangle.Height; yy+=5)
                    {
                        Int32 avgR = 0, avgG = 0, avgB = 0;
                        Int32 imagePixelCount= 0;
    
                        // average the color of the red, green and blue for each pixel in the
                        // size while making sure you don't go outside the image bounds
                        for (Int32 x = xx; (x < xx + 4 && x < image.Width); x++)
                        {
                            for (Int32 y = yy; (y < yy + 5 && y < image.Height); y++)
                            {
                                Color pixel = image.GetPixel(x, y);
    
                                avgR += pixel.R;
                                avgG += pixel.G;
                                avgB += pixel.B;
    
                                imagePixelCount++;
                            }
                        }
    
                        avgR = avgR / imagePixelCount;
                        avgG = avgG / imagePixelCount;
                        avgB = avgB / imagePixelCount;
    
                        float Y = 0.2126f * avgR + 0.7152f * avgG + 0.0722f * avgB;
    
                        if (Y > 128)
                        {
                            avgR = 255;
                            avgG = 255;
                            avgB = 255;
                        }
                        else
                        {
                            avgR = 0;
                            avgG = 0;
                            avgB = 0;
                        }
    
                        //set each pixel to that color
                        for (Int32 x = xx; x < xx + 4 && x < image.Width && x < rectangle.Width; x++)
                            for (Int32 y = yy; y < yy + 5 && y < image.Height && y < rectangle.Height; y++)
                                image.SetPixel(x, y, Color.FromArgb(avgR, avgG, avgB));
                    }
                }
    Here is a normal vs. patched comparison: https://i.imgur.com/1sFQl.jpg
    Last edited by eldavo1; 09-13-2012 at 06:31 AM.

  7. #232
    Winsane's Avatar Contributor (ノಠ益ಠ)ノ彡ɹǝɥɔʇɐM
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    So is the goal right now to create a program that can automatically get all the info out of any screenshot? I'm very impressed.

  8. #233
    eldavo1's Avatar Member
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    Originally Posted by Winsane View Post
    So is the goal right now to create a program that can automatically get all the info out of any screenshot? I'm very impressed.
    Hopefully. I doubt you can extract enough information out of normal screenshots anyway, but currently we can do it with perfect screenshots, trying to get it with screenshots on a blank terrain then on normal screenshots.

    What I done quickly: You can change quality of luminosity and cropping. Has a patch preview now (although aspect ratio is broken), I removed the image manipulation besides luminescence and cropping because it didnt work very well. My GUI skills aren't the greatest either, sorry.

    EXE: ImageToBinary.exe

    Image of it: https://i.imgur.com/ilAtt.png
    Last edited by eldavo1; 09-13-2012 at 07:12 AM.

  9. #234
    stvs's Avatar Private
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    This looks like a false alarm to me, probably caused by IrfanView integer rounding funkiness.

    The posted all-white image [uploaded at https://i.imgur.com/HyGGl.jpg] that's supposed to to contain the stego really is all white. Undoubtedly the poster has detected some silly rounding artifact from IrfanView, which doesn't use the greatest jpeg libraries. The rest of the comments are just a goose chase extracting meaning from rounding noise.

    Here's a few simple tests.

    Compare every single pixel's RGB value to 0xff in Matlab:

    >> A = imread('~/Downloads/HyGGl.jpg'); >> size(A) ans = 225 400 3 >> A(1,1,1) ans = 255 >> all(A( == 255) ans = 1

    Or just try to equalize it in Adobe Photoshop and get the error message "Could not complete the Equalize command because the image has only one brightness value."

    That's enough, but let's take the opportunity to play with stegdetect (looks for a few common strategies) and look at the jpeg headers.

    There's no there there.

    $ sudo port install jhead stegdetect

    $ stegdetect HyGGl.jpg
    HyGGl.jpg : negative

    $ jhead -v HyGGl.jpg
    Jpeg section marker 0xdb size 67
    Jpeg section marker 0xdb size 67
    JPEG image is 400w * 225h, 3 color components, 8 bits per sample
    Jpeg section marker 0xc4 size 21
    Jpeg section marker 0xc4 size 20
    Jpeg section marker 0xc4 size 20
    Jpeg section marker 0xc4 size 20
    File name : HyGGl.jpg
    File size : 846 bytes
    File date : 2012:09:13 09:46:50
    Resolution : 400 x 225

  10. #235
    Trixiap's Avatar Contributor
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    Yes... everyone here is goose and Adobe Photoshop use same library as IrfanView... Code in client for include watermark in screenshot is bug from IrfanView, we know... Open your screen and use Sharpening filter in any photoediting soft you will see. I think that white "screenshot" is not screenshot from game, just white image to show what you need achieve to be able extract watermark

    BTW you can get "clear" screenshot if you take your view distance to min and fly high up then take screenshot without UI and 1st person view
    Last edited by Trixiap; 09-13-2012 at 10:11 AM.

  11. #236
    5tvs's Avatar Private
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    The imgur.com images and the OP's original images are different.

    I retract my comments above based on the imgur.com file—when you look at the poster's original files, not the imgur.com files, you clearly see the watermarks by simple sharpening.

    Furthermore, stegdetect gets a hit with the F5 algorithm:

    $ stegdetect -t F scr2sm.jpg
    scr2sm.jpg : f5[0.312094](**)

    stegbreak doesn't go after F5, but I'd look to F5 crackers first to extract the information. Anyone done this yet?

  12. #237
    Sendatsu's Avatar Contributor
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    Originally Posted by eldavo1 View Post
    What I done quickly: You can change quality of luminosity and cropping. Has a patch preview now (although aspect ratio is broken), I removed the image manipulation besides luminescence and cropping because it didnt work very well. My GUI skills aren't the greatest either, sorry.

    EXE: ImageToBinary.exe

    Image of it: https://i.imgur.com/ilAtt.png

    I really like how this is moving along!


    Originally Posted by allnei View Post
    I think that white "screenshot" is not screenshot from game, just white image to show what you need achieve to be able extract watermark
    Originally Posted by 5tvs View Post
    The imgur.com images and the OP's original images are different.

    I retract my comments above based on the imgur.com file—when you look at the poster's original files, not the imgur.com files, you clearly see the watermarks by simple sharpening.

    Yes, the white screenshot was purely white, not to be taken literally. In order to avoid any further confusion I replaced it with one that contains a watermark inside: https://i.imgur.com/c9h2w.jpg


    Originally Posted by 5tvs View Post
    Furthermore, stegdetect gets a hit with the F5 algorithm:

    $ stegdetect -t F scr2sm.jpg
    scr2sm.jpg : f5[0.312094](**)

    stegbreak doesn't go after F5, but I'd look to F5 crackers first to extract the information. Anyone done this yet?

    That's an interesting find. I had used "StegSpy2.1" and it only gave me a false positive on one image and nothing on the rest.

    If this is indeed true, someone needs to have a look at it. http://cs.marlboro.edu/term/spring06...reaking_f5.pdf
    Last edited by Sendatsu; 09-13-2012 at 01:13 PM.

  13. #238
    Thundathigh's Avatar Master Sergeant
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    Originally Posted by DeXoY View Post
    I found a pretty good solution to "check" normal screenshots, for that pattern.
    go here: Free Online Image Error Level Analysis using HTML5 - 29a.ch
    drag and drop your screenshot in there and play around with the sliders.
    This is an example from my screenshot. I just marked the pattern with paint.
    This was posted 4 pages back... come on guys catch up! =P
    Originally Posted by eldavo1 View Post
    ...
    My GUI skills aren't the greatest either, sorry.

    Image of it: https://i.imgur.com/ilAtt.png
    Haha if you think that that GUI is bad, probably shouldn't be showing mine anytime soon xD
    Last edited by Thundathigh; 09-13-2012 at 02:11 PM.

  14. #239
    ukilliheal's Avatar Private
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    Is there anyway i can help with this? I know a little bit of java ( ytuscheduler - The only desktop app that can schedule a Youtube upload - Google Project Hosting ) and a little unix scripting ( autocrack - Automatic WEP cracking - Google Project Hosting )

  15. #240
    Sendatsu's Avatar Contributor
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    Originally Posted by ukilliheal View Post
    Is there anyway i can help with this? I know a little bit of java ( ytuscheduler - The only desktop app that can schedule a Youtube upload - Google Project Hosting ) and a little unix scripting ( autocrack - Automatic WEP cracking - Google Project Hosting )
    Hello ukilliheal

    Thanks for offering! We are currently trying to find a way to identify the embedded watermark inside normal screenshots. We are experimenting with luminance and other factors to differentiate between actual pixels and altered ones. Take a look at the currently available source codes, screenshots, papers and patents mentioned in this thread and perhaps you will be able to figure out a way to extract this without any loss.

    We also have a few open questions like whether this watermark has been inserted using a steganography algorithm like F5 (see above) or perhaps some other multiple-pass method.

    Whatever you can come up with will help

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