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Compositing – Understanding Premultiplied Images
https://compositing.wordpress.com/2010/09/13/premultiply-unpremultiply/
A premultiplied images is an image that has the RGB multiplied by the alpha channel.
This is usually for creating transparency when merging with a background (with the over operation). However problems occur when colour correcting the premultiplied image.
‘Unpremultiple’ is the process of dividing the alpha out of the image. Then the colour corrections can be done. After this stage, the alpha can then again be multiplied back in. This can often be done within the colour correction node itself, or manually.
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Life advice upon turning age 30 from the president of YCombinator
http://qz.com/394713/life-advice-upon-turning-age-30-from-the-president-of-y-combinator/
Short version:
1) Never put your family, friends, or significant other low on your priority list.
2) Life is not a dress rehearsal—this is probably it.
3) How to succeed: pick the right thing to do
4) On work: it’s difficult to do a great job on work you don’t care about.
5) On money: Whether or not money can buy happiness, it can buy freedom, and that’s a big deal.
6) Talk to people more.
7) Don’t waste time.
8) Don’t let yourself get pushed around.
9) Have clear goals for yourself every day, every year, and every decade.
10) However, as valuable as planning is, if a great opportunity comes along you should take it.
11) Go out of your way to be around smart, interesting, ambitious people.
12) Minimize your own cognitive load from distracting things that don’t really matter.
13) Keep your personal burn rate low.
14) Summers are the best.
15) Don’t worry so much.
16) Ask for what you want.
17) If you think you’re going to regret not doing something, you should probably do it.
18) Exercise. Eat well. Sleep.
19) Go out of your way to help people.
20) Youth is a really great thing.
21) Tell your parents you love them more often.
22) This too shall pass.
23) Learn voraciously.
24) Do new things often.
25) Remember how intensely you loved your boyfriend/girlfriend when you were a teenager? Love him/her that intensely now.
26) Don’t screw people and don’t burn bridges.
27) Forgive people.
28) Don’t chase status.
29) Most things are ok in moderation.
30) Existential angst is part of life.
31) Be grateful and keep problems in perspective.
32) Be a doer, not a talker.
33) Given enough time, it is possible to adjust to almost anything, good or bad.
34) Think for a few seconds before you act. Think for a few minutes if you’re angry.
35) Don’t judge other people too quickly.
36) The days are long but the decades are short.
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20000 stars transition every sec ond from being reach able to being unreachable
The expansion of the Universe is a key feature of the Big Bang cosmology and is a generic property of the universe we inhabit. Since Edwin Hubble”s observation in 1929, which led to the discovery of the expansion of the Universe, astronomers try to understand the behavior of it. Several models were created up today which shall explain the past and the future expansion: A decelerating universe reaches its current size in the least amount of time. The universe could eventually contract and collapse into a “big crunch” or expand indefinetly. A coasting universe is older than a decelerating universe because it takes more time to reach its present size and expands forever. An accelerating universe on the other hand is older still. The rate of expansion actually increases because of a repulsive force that pushes galaxies apart.
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