PMunch (u/PMunch) - Readit News

PMunch commented on Dithering – Part 2: The Ordered Dithering visualrambling.space/dith... · Posted by u/ChrisArchitect

shultays · a month ago

I had a project with those 7 colour e-paper displays and used dithering and it looked amazing. Crazy how much you could fake with just 7 colours and dithering

PMunch · a month ago

Definitely, I've been trying out a lot of dithering algorithms, and while they have big differences with only black and white as soon as you start adding more shades of grey they all look pretty much exactly the same as the input image. I'd imagine good dithering with colours would look amazing

PMunch commented on Dithering – Part 2: The Ordered Dithering visualrambling.space/dith... · Posted by u/ChrisArchitect

quag · a month ago

After implementing a number of dithering approaches, including blue noise and the three line approach used in modern games, I’ve found that quasi random sequences give the best results. Have you tried them out?

https://extremelearning.com.au/unreasonable-effectiveness-of...

PMunch · a month ago

Just had a look at this and here is the result for the test image: https://uploads.peterme.net/test-image_qr.png.

Looks pretty good! It looks a bit like a dither, but with fewer artifacts. Definitely a "sharper" look than blue noise, but in places like the transitions between the text boxes you can definitely see a bit more artifacts (almost looks like the boxes have a staggered edge).

Thanks for bringing this to my attention!

PMunch commented on Dithering – Part 2: The Ordered Dithering visualrambling.space/dith... · Posted by u/ChrisArchitect

storystarling · a month ago

Nice writeup. I've been looking at this for a print-on-demand project and found that physical ink bleed changes the constraints quite a bit compared to e-paper. In my experience error diffusion often gets muddy due to dot gain, whereas ordered dithering seems to handle the physical expansion of the ink better.

PMunch · a month ago

Thanks! I would imagine printing on paper would be a completely different ball game. I actually considered scanning the actual epaper display to show each of the dithering techniques in their intended environment as it does change the look quite a bit. From the little I know about typography and things like ink-wells I can definitely see how certain algorithms can change quite significantly. The original post here has a pattern which looks similar to old newspapers, maybe that's worth looking into?

PMunch commented on Dithering – Part 2: The Ordered Dithering visualrambling.space/dith... · Posted by u/ChrisArchitect

quag · a month ago

After implementing a number of dithering approaches, including blue noise and the three line approach used in modern games, I’ve found that quasi random sequences give the best results. Have you tried them out?

https://extremelearning.com.au/unreasonable-effectiveness-of...

PMunch · a month ago

Ooh, I haven't actually! I'll need to implement and test this for sure. Looking at the results though it does remind me of a dither (https://pippin.gimp.org/a_dither/), which I guess makes sense since they are created in a broadly similar way.

PMunch commented on Dithering – Part 2: The Ordered Dithering visualrambling.space/dith... · Posted by u/ChrisArchitect

PMunch · a month ago

Just did a bit of a deep dive into dithering myself, for my project of creating an epaper laptop. https://peterme.net/building-an-epaper-laptop-dithering.html it compares both error diffusion algorithms as well as Bayer, blue noise, and some more novel approaches. Just in case anyone wants to read a lot more about dithering!

PMunch commented on Pebble Round 2 repebble.com/blog/pebble-... · Posted by u/jackwilsdon

lilactown · 2 months ago

Would buy this in a heartbeat (pun intended) if it came with a heart rate monitor.

I had the first Pebble Time Round and it's my favorite smart watch I've ever owned, but these days the things I want from a watch are to tell the time and collect biometrics. Taking a step back in biometrics feels like a bummer. I also totally buy that it would increase the foot print in a way that would feel way less slim.

PMunch · 2 months ago

Same! I've already signed up for the Time 2 and super stoked for it, then I saw the announcement for the Round 2 and I was about to switch over until I noticed it didn't have a heart rate sensor. I know its sleek and elegant, but that slight bulk would be worth it in my opinion. And who knows, with the extra thickness they might've been able to squeeze in more battery to get it to the 30 days battery life cited for the Time 2.

Also unfortunate that it's missing the RGB backlight of the Time 2. I can think of a few good use cases for it, but if it's only on the Time 2 that means fewer apps would use it.

PMunch commented on Show HN: I built a fast RSS reader in Zig github.com/superstarryeye... · Posted by u/superstarryeyes

A1aM0 · 3 months ago

The 'once a day' fetching limitation is a fascinating idea. It really captures the vibe of reading a physical newspaper in the morning rather than constantly checking for updates. I think many of us could use a tool that enforces a bit of 'digital silence' like this.

PMunch · 3 months ago

I've been wanting a browser plugin like this for ages. Basically tell it which sites to limit, then once loaded it won't re-load for a certain amount of time, or until the next day (not necessarily 24 hours). This way there is no reason to keep checking the news, they won't change.

PMunch commented on Pebble Index 01 – External memory for your brain repebble.com/blog/meet-pe... · Posted by u/freshrap6

lopis · 3 months ago

That's interesting. A Piezo Button generates enough power to send a radio signal?

PMunch · 3 months ago

Indeed, I have a remote doorbell where the outer button is a piezo button and the inside bell part is connected to a socket. But the button is quite thick, presumably because it needs a bit of travel to get enough energy. Granted that's for a device that sends multi-wall penetrating strength of 433Mhz radio waves. For something like this where the distance is only about 25cm you might be able to get a button small enough.

PMunch commented on Nimony (Nim 3.0) Design Principles nim-lang.org/araq/nimony.... · Posted by u/andsoitis

polotics · 3 months ago

ok I do not understand.

What is preventing this import std/errorcodes

from allowing me to use: raise errorcodes.RangeError instead of what Nim has?

or even why not even "import std/ErrorCodes" and having the plural in ErrorCodes.RangeError I wouldn't mind

PMunch · 3 months ago

Nothing, and it fact this works. To move to an example which actually compiles:

    import math
    
    echo fcNormal
    echo FloatClass.fcNormal
    echo math.fcNormal
    echo math.FloatClass.fcNormal

All of these ways of identifying the `fcNormal` enum value works, with varying levels of specificity.

If instead you do `from math import nil` only the latter two work.