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You 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
by axiolite 1y ago
You 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.
https://ibb.co/DDQBJDKR https://ibb.co/DDQBJDKR
- bobmcnamara 1y agoComputer vision mode: and each screenshot together.
- LadyCailin 1y agoOr just copy the text from the url. Not very secure, really. :D
- mike_hearn 1y agoOr just ... record a video of the screen.
- whitten 1y agoWhat tool do you use to make such a video ?
- mike_hearn 1y agoOn macOS it's built in. The screenshot tool can do it. For more professional work I use ScreenFlow.
- cloudbonsai 1y ago> You can take TWO screenshots, moments apart, open in GIMP, paste one over the other and choose any one of these laying modes: You actually don't need any image editing skill. Here is a browser-only solution: 1. Take two screenshots. 2. Open these screenshots in two separate tabs on your browser. 3. Switch between tabs very, very quickly (use CTRL-Tab) Source: tested on Firefox
- milkshakes 1y agoreminds me of this: https://www.reddit.com/r/LifeProTips/comments/5jdzsx/lpt_use_crosseyed_method_to_solve_spot_the/ https://www.reddit.com/r/LifeProTips/comments/5jdzsx/lpt_use...
- CGMthrowaway 1y agoI went cross-eyed on my screenshot, and I couldnt read the word, but I did notice some artifacts
- JadeNB 1y agoThis was used in some early-20th-century astronomical setting, I think to detect supernovae. I can't find any documentation now, but my memory is that it was called "blink testing" or something similar, where one switched rapidly between two images of a star field so that changes due to a supernova would stand out.
- rogerrogerr 1y agohttps://en.m.wikipedia.org/wiki/Blink_comparator https://en.m.wikipedia.org/wiki/Blink_comparator
- JadeNB 1y agoThat's it exactly! Thanks.
- azinman2 1y agoYou could also just record a video.
- jama211 1y agoHah, indeed, that was my first thought. This is clearly for fun though, it’s a cool project idea
- 1y ago
- sunrunner 1y agoNeat idea. A friend of mine made a similar animated GIF type captcha a few years ago but based on multiple scrolling horizontal bars that would each reveal their portion of the underlying image including letters, and made a (friendly) bet that it should be pretty hard to solve. Grabbing the entire set of frames and greyscaling them, doing an average over all of them and then applying a few minor fixups like thresholding and contrast adjustment worked easily enough as the letters were reveleaed in more frames than not (I don't think that would affect the difficulty much though if it were any diffierent). After that the rest of the image was pretty amenable to character recognition.
- aw1621107 1y agoThat's reminiscent of a (possibly apocryphal?) method I once read about to get "clean" images of normally crowded public places - take multiple photos over time, then median each pixel. Never had the opportunity to try it myself, but I thought it sounded plausible as a way to get rid of transient "noise" from an otherwise static image.
- axiolite 1y agoThat's a real method: https://digital-photography-school.com/taking-photos-in-busy-tourist-destinations-with-no-people-in-the-shot/ https://digital-photography-school.com/taking-photos-in-busy... https://petapixel.com/2019/09/18/how-to-shoot-people-free-photos-of-crowded-places/ https://petapixel.com/2019/09/18/how-to-shoot-people-free-ph... But it only works well if the crowds move out of the way reasonably quickly. If we're taking about areas packed with people all blocking a certain area, and you need hours of shots, the change in ambient lighting over time will have negative effects on the end photo.
- aw1621107 1y agoAh, that's the method indeed! Thanks!
- aptly_yclept 1y ago
- amelius 1y agoYeah if this became popular, we'd have another Show HN for a tool that automated that.
- postalcoder 1y agoOut of sheer curiosity, I put three screenshots of the noise into Claude Opus 4.1, Gemini 2.5 Pro, and GPT 5, all with thinking enabled with the prompt “what does the screen say?”. Opus 4.1 flagged the message due to prompt injection risk, Gemini made a bad guess, and GPT 5 got it by using the code interpreter. I thought it was amusing. Claude’s (non) response got me thinking - first, it was very on brand, second, that the content filter was right - pasting images of seemingly random noise into a sensitive environment is a terrible idea.
- burstmode 1y ago> pasting images of seemingly random noise into a sensitive environment is a terrible idea. Only if your rendering libraries are crap.
- dansmith1919 1y agoI think they mean prompt injection rather than some malformed image to trigger a security bug in the processing library
- catlifeonmars 1y agoThe LLM is the image processing library in this case so you are both right :)
- apricot 1y ago> pasting images of seemingly random noise into a sensitive environment is a terrible idea BLIT protection. https://www.infinityplus.co.uk/stories/blit.htm https://www.infinityplus.co.uk/stories/blit.htm
- gus_massa 1y agoIs it possible to modify the webpage to make the pattern of the text go down and the pattern of the background do up?
- deleted 1y ago[deleted]
- SparkyMcUnicorn 1y agoYes: https://jsfiddle.net/kx6stbcL/ https://jsfiddle.net/kx6stbcL/
- flux3125 1y agoBut then that would be a video, not a screenshot
- jdiff 1y agoLayered images do not a video make. Sequential images distributed over time do.
- sieabahlpark 1y ago[dead]
- bonyt 1y agoI've found taking two screenshots and adding them as separate layers works well, and then setting one as Difference, and then tweaking the opacity. Here it is in Pixelmator Pro: https://i.moveything.com/299930fb6174.mp4 https://i.moveything.com/299930fb6174.mp4
- loopduplicate 1y agoBottom layer normal, second layer grain extract, top layer vivid light. This completely blacks out the whole area outside of the text.
- deleted 1y ago[deleted]