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Comment: Re:Can someone clarify the state of BitCoin? (Score 2) 134

by vadim_t (#47863271) Attached to: Paypal Jumps Into Bitcoin With Both Feet

It's risky of course, but it has its upsides. Eg, here's an ID:

1GFRGRC37baNYgL6JbwrbXft2XjDHskFwf

If you want to buy me a beer, it's easy. No need to exchange personal information, mess with bank transfers, or anything of the sort. I can accept payments without even making any preparation -- install the client, generate the ID, figure out how to get the money later. That's the sort of thing where I think it does great -- allowing the near equivalent of just buying somebody a beer in person, but through the internet.

For large amounts, yes, you better be careful, and be willing to take the risk.

Comment: Re:Can someone clarify the state of BitCoin? (Score 2) 134

by vadim_t (#47863191) Attached to: Paypal Jumps Into Bitcoin With Both Feet

Yes, but:

You buy 0.1 BTC at $500/BTC. Later you buy 0.2 BTC at $550/BTC. Later you buy 0.2 BTC at $560/BTC. Your client will say you have 0.5 BTC, but internally there actually are 3 separate accounts that it'll handle transparently. If you pay 0.3 BTC to somebody, it'll have to issue payments from at least two of them.

So, you wait a month, now it's $570/BTC, and sell 0.05 BTC.

My understanding is that it's perfectly possible that your client will decide to source bitcoins from all 3 accounts in some random quantities that add to 0.05. So how much have you gained? Hard to tell, since the standard client won't directly tell you what accounts it used, and doesn't know how much you bought each part of your balance for, it doesn't do banking at all.

Comment: Re:Can someone clarify the state of BitCoin? (Score 5, Informative) 134

by vadim_t (#47862855) Attached to: Paypal Jumps Into Bitcoin With Both Feet

I'm not exactly a guru of bitcoin, but I'll summarize as somebody who's tried it recently out of curiosity.

Getting into it is surprisingly difficult. Purchasing bitcoins right now (or before paypal maybe) is pretty hard. Near impossible to find a site that will let you buy with a credit card, because sellers get screwed over with chargebacks.

Mining bitcoin at this point isn't worth it. At all. A high end GPU working 24/7 would get you $10 per month while costing more in power. At this point mining is only profitable to people willing spend a lot of money on very specialized hardware.

Once you have some, it's easy enough to use. But it's an unregulated system, so there is some danger and no safety net. If you're ever going to put serious money into it, be very, very careful. Danger comes both from things like getting hacked, and from that the value fluctuates without any central control.

Tax-wise it seems tricky. It seems (you're nuts if you take advice from a random stranger on this) that it's considered an asset, and if bitcoin gains in value you have to pay tax on that. Up to you to figure out how to keep track of it and do it properly.

As far as working, it does. You can buy stuff with it fine, and the USD/BTC exchange rate is stable enough. If you have cash to spare it might be worth to get some, just in case it increases a lot in value (I doubt paypal would get into it without consulting a bunch of lawyers), but you'd be nuts to put your life savings into it.

Comment: Re:Probably known already (Score 4, Insightful) 114

No, like the [Dual EC DRBG](http://en.wikipedia.org/wiki/Dual_EC_DRBG) controversy.

I love it how people (shills?) keep bringing up DES S-boxes, as if they had anything to do with anything. The thing with DES was in 1975. Almost 40 years ago. Since then the NSA went through 10 directors, and the US through 8 presidents. And most of the staff in high positions died or retired.

It's ridiculous to try to pretend that something nice a completely different NSA did 40 years ago has the slightest relevance to today's completely different environment and politics.

Comment: Re:Meh (Score 1) 129

by vadim_t (#46818333) Attached to: Lytro Illum Light-Field Camera Lets You Refocus Pictures Later

Except you get much less zoom and enhace with this thing because you reduce your resolution to 10% of the sensor's capability for the sake of the depth of field control. A 40mp sensor turns into a 4 mp one. A face 100 pixels wide on an image is useful. A face that's 10 pixels wide, rather less so.

For CSI you'd want the near opposite of this camera: high resolution, a small aperture to keep everything at once in focus, focused to infinity, and excellent low ISO performance to compensate for the small aperture.

Comment: Re:Meh (Score 4, Insightful) 129

by vadim_t (#46817665) Attached to: Lytro Illum Light-Field Camera Lets You Refocus Pictures Later

- Yes it is $1600 and 4MP. Do you know how much the first DSLRs were with only 1MP? Technology evolves.

The problem is that physics get in the way of resolution increases, and the best modern DSLRs already have a sensor that can out-resolve most lenses.

Which means that a Lytro style camera is going to necessarily sacrifice quality.

You can make a larger sensor, but that costs serious $$$. This thing is in the price range of a full frame camera. If I'm guessing right, to compete in quality with a normal one it'd have to go with a medium format sensor, and those start at around $10K.

- Why do you need interchangeable lenses when you can focus on or apply lens effects on whatever you want after the fact? You would not care about lenses with this kind of technology at all - in fact, the elimination of lenses means this technology could result in large cost savings over the long haul.

Because lenses have nothing to do with focusing? All lenses can focus at all ranges. You can't put a f/1.4 on this for shallower depth of field and better low light performance, or a 10mm wide angle, or a fish eye, or a better telephoto lens, or a tilt/shift for architecture.

It could however be very cool for macro, but oddly enough they don't seem to be hurrying to demonstrate that. Which is a pity -- extreme macro is a huge pain to focus, and that's the one area where this thing could show some promise.

Comment: Meh (Score 4, Insightful) 129

by vadim_t (#46817465) Attached to: Lytro Illum Light-Field Camera Lets You Refocus Pictures Later

It's mostly a solution in search of a problem.

Photographers choose what to focus on very intentionally, it rarely makes sense to focus on anything else. Of course it's possible to misfocus, but in that case it makes no sense to let the user play with it.

It's still going to be low res, because you get a small fraction of the "megarays" the sensor provides. The spec for this camera was 40, IIRC, so it might get around 4MP, which can't really compete with a modern DSLR. While resolution isn't everything, having some margin for cropping and large prints is a very good thing.

The control for the interactive photos is still clunky. I can't find a way to for instance get the whole image in focus, though that should be possible. It does it while changing perspective.

It doesn't fix the other problem that leads to blurriness -- camera shake. It's all well and good to be able to refocus, but most people learn to focus right pretty fast. The problem is with low light environments, and this isn't going to save you if you handhold and shoot at 1/10.

The sample images still looks low res and blurry.

It costs $1600 and doesn't seem to have interchangeable lenses -- what, are they insane?

Overall interesting toy, but doesn't seem to have a practical use.

Comment: Re:Curiosity if you don't mind (Score 2, Informative) 693

by vadim_t (#46740937) Attached to: The GNOME Foundation Is Running Out of Money

The Linus/systemd controvery is long over btw. People had a conflict, yelled a bit at each other, then came up with patches, and everything went back to normal.

Personally I like at least the idea of systemd. It means I can make a single startup script, and have most of the work done by the system, instead of having to muck around with the minor differences of the ubuntu/debian/etc scripts.

Comment: Re:From the parent article: (Score 4, Insightful) 693

by vadim_t (#46740891) Attached to: The GNOME Foundation Is Running Out of Money

Let me translate. They were fucking off by diverging from the core project into recreational political activities unrelated to their mission.

But that seems to be what a lot of people on Slashdot want. Look at the Mozilla and DropBox controversies. Lots of people posting and moderating support those.

No, I'd say what people here want in general is for an organization to be apolitical. Being against LGBT is bad, but doing activities related to LGBT is also bad. A software company is supposed to be a bunch of people coding and nothing else, ideally.

Deviations are allowed only for subjects related to the core mission: patents, copyright, open source, etc.

Comment: That would be a great display for the Oculus Rift (Score 1) 217

by vadim_t (#46550265) Attached to: Oppo's New Phone Hits 538 PPI

I have DK1 and ordered DK2.

DK1 is cool as a prototype, but the lack of positioning gets annoying at times, and the resolution is horrible.

DK2 fixes that, but it sounds like the resolution still needs improving.

This is the kind of thing I'd love to have in there. The Rift as it stands right now won't work well with many UIs, as it's too low res to render the details, and it seriously breaks immersion to see things pixellated.

So the more the better I say, if it's overkill for a phone then there are other uses for it.

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