Files for the channel & chat photos
Would prefer to remove text anti-aliasing (or make the alpha channel single bit), but haven't found such option

1992: split a file into a multivolume archive to fit into floppy disks
2022: split a file into a multivolume archive to fit into discord upload filesize limit

I'm a calendar

⑨

This day has come

https://youtu.be/-BP7DhHTU-I

#links #video #youtube #minecraft

⚙️ 🔁 Vftdan
There are 2 ways to treat your Thinkpad:

cc
@hatkidchan @dettlaff

1. Google for an InterTurkic conlang
2. Follow the link to http://ib.frath.net/w/InterTurkic
3. From it, follow the link to Turkestan
4. ???
5. Start loosing your mind

Seems to be an alternative history AU wiki or something, but it doesn't even have the main page, so I cannot tell certainly

Apparently, images can store their pixels' rgb values premultiplied by their alpha value, so drawing them over backgrounds takes 1 less operation

https://www.youtube.com/watch?v=XobSAXZaKJ8

#links #video #youtube

Actually, I think I have never read about the proper way of overlaying several colors.

But when I was in the middle school and was writing JavaScript on an iPhone, I think I read about getImageData and setImageData on habr.com and so tried working with it myself. I either invented or read somewhere (possibly in that article) about lerp function and somehow invented myself a way of overlaying 2 rgba colors. The formula for the resulting alpha was a monstrosity of a redundant number of lerps.

Later, in the high school, I found that code, simplified the formula and used it again for working with ImageData.

So, I'm interested how correct my formula is. I'll translate (hopefully, correctly) it to GLSL, so it's (probably) easier to read, apparently lerp is named mix there:

float aa = (1.0 - fg.a) * bg.a;
gl_Color.rgb = mix(fg.rgb, bg.rgb, aa);
gl_Color.a = aa + fg.a;

I. e. resulting alpha = lerp(bg.alpha, 1, fg.alpha). It makes sense indeed: if fg.alpha = 0, then the background color doesn't change, so alpha is bg.alpha; if fg.alpha = 100%, then the foreground color is the result, so alpha is 100%.

So according to this code, you actually need (1 - bg.a * (1 - fg.a)) instead of fg.a to be multiplied by fg.rgb, so premultiplication is only useful for fully opaque backgrounds.

#original

Cascading jaywalking consensus protocol