Seems trivial to diff multiple screenshots to identify what parts move. Or just use a compression algorithm to do the same.
Would 2 screenshots be enough, I wonder?
Yeah, the letters are big enough, an xor shows the text quite clearly.
Show HN: The text disappears when you screenshot it
41–50 of 204 posts
Re: Show HN: The text disappears when you screenshot it
#42Has anyone tried a long exposure to see if the motion smears into something discernible? Obviously harder to expose a bright screen without some ND since the shutter speed is the phone's main exposure control
Here's the screen recording version of a long exposure (thanks for the nerd snipe) - https://gist.github.com/spro/7599415b0e47de65311557b3454771a...
Perhaps this technique could be defeated by scrolling the background in the opposite direction as the text
Re: Show HN: The text disappears when you screenshot it
#43Earlier quoted context omitted.
It depends how fast or slow your GPU is. I tried it and saw the effect you described, but within a second or two it started moving and was obscured again. Obviously you could automate the problem away.
Mine freezes the animation on zoom change. Not sure you could automate against that
What I meant was that even if it only freezes for a second, you could automate the screenshots to be captured during that time instead of trying to beat the clock manually
Re: Show HN: The text disappears when you screenshot it
#44Ha cool! How’s it work?
The only way to see the text is in the movement. The pattern across any single frame is entirely random noise.
> The pattern across any single frame is entirely random noise.
This is untrue in at least one sense. The patterning within the animated letters cycles. It is generated either by evaluating a periodic function or by reading from a file using a periodic offset.
Re: Show HN: The text disappears when you screenshot it
#45You can also break it by recording the screen, of course.
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Re: Show HN: The text disappears when you screenshot it
#46You can take TWO screenshots, moments apart, open in GIMP, paste one over the other and choose any one of these laying modes:
Lighten, Screen, Addition, Darken, Multiply, Linear burn, Hard Mix, Difference, Exclusion, Subtract, Grain Extract, Grain Merge, or Luminance.
Re: Show HN: The text disappears when you screenshot it
#47For what it's worth, there are some websites that embed some crazy shit when you screenshot. On reddit, r/CenturyClub will fill your background with a slightly off-white version of your username so that they can identify leakers, and I'm not certain how exactly they do it.
Re: Show HN: The text disappears when you screenshot it
#48Earlier quoted context omitted.
Clearly, I meant using a camera, and I'm guessing you knew that too
Not the parent but that was not at all clear to me. I immediately thought of taking multiple successive instantaneous screenshots and then stacking them. I'm not sure I would have thought of using a camera within a few minutes to an hour, it's not a tool I would ever reach for normally.
Also not the parent but how the hell did you not understand what "long exposure" means ffs
Re: Show HN: The text disappears when you screenshot it
#49What i am supposed to see here? Its just static noisy background
Re: Show HN: The text disappears when you screenshot it
#50Screnshotted fine in Xfce.