天空вℓσи∂ [Deprecated edition] @skyblond@social.cleverlibre.org

@freemo What if they just insert ads in user's toot? Nobody reads eula anymore, and they can ask permits from user and send toots containing ads and trackers. Then they will be all over the place.

You have to subscribe to YouTube premium to use the screen lock feature? (The feature to prevent false touch when watching videos).

If you have to subscribe to the premium plan to get high bitrate videos, that's acceptable. But screen lock? VLC has this feature for years, and it's free of charge.

Google, really? 🤔

@hanawa 推荐使用biglybt（无端传教

@wzyboy 我不是很理解这其中的逻辑。你公开发到网上的内容，希望一部分人看到，但又不希望另一部分人看到，这听起来更像是朋友圈，而不是联邦宇宙。。。

（更何况这技术上不可能做到，只要你发在网上，就没法保证谁能看谁不能看）

@vonhyou 我之前试过rdp，体验不是很好，但是三星dex可以提供一个很近似桌面体验的环境，感觉很有潜力

（什么时候jetbrains推出安卓客户端啊）

Talking about ink, I just bought some ink cartridges from Platinum. I know I don't like this thing, but I think keep carbon ink dried in pen is much worse.

@freemo Yeah, I wrote a lot when I was in school, and carbon black ink is better than the black dye ink.Thee dye-based one looks like dark purple instead of true black.

But now I mainly write things with pencil (easy to change the design), so the carbon ink often dried in the pen.

@freemo I have a #3776 Century (F tip) from Platinum, it's the cheapest model (~100 USD). I started using it since high school and now I still use it.

I'm not a fan of collecting pens, but I do like using pens since I don't need to swap the cartridges (the Gel Pen Refills). This pen works very well. Before that, I was using LAMY (also the cheapest model, about ~20 USD), but it had a lot of problems and I eventually decided to invest more.

I like using carbon black ink, however it's not good for pens, especially when you don't write a lot. But this pen handles it pretty well.

But now I rarely do handwriting after graduated. I don't know if this is good, but the ultrasonic cleaner is pretty good at dealing with dried carbon ink.

@trinsec @olives I saw the error page sometimes, but most of the time it is just stuck there, didn't timeout, but also not receiving data. But now it looks like fine.

Did goto just go offline for a while?

To resist jpeg compression, I use the LL matrix of the Haar DWT result (which should contain low freq data that can be preserved by JPEG), then chunk it into 4x4 chunks, then apply DCT and SVD to each chunk, then encode the bits into the first and second element of the S matrix.

It certainly works, but any other steganography could work too if it leaves a strong and visible mark on the image, which surely can be preserved by JPEG compression (Modify low freq in FFT space, or just use the MSB).

I swear there are visible stripes in the dark area, like the screenshot I take in picture 4. But I don't know why it's not visible anymore, probably because of the compression. LOL

Tried to implement a paper based on its abstract, because I'm not willing to pay 40 USD. The result is a mix of success and failure.

The paper introduced a steganography called DWT-DCT-SVD, which is applying DWT to a picture and then applying DCT and finally encoding bits into the S matrix of the SVD operation.

The first picture is encoded picture after jpeg compression (photoshop, quality 8, raw picture is 90MB in png), picture 2 is the intended decoded result, and picture 3 is the jpeg decoded result. I would say not bad...

... unless you zoom in on the picture and notice there are a lot of stripes giving off the fact that this picture is suspicious (picture 4).