Cover photo
Yongki Citradi AndykaJong
Lives in Bali
1,667 followers|43,797 views


+Novita Listyani originally shared:

"There is a place I want you to see"
Today I would like to share and introduce you to the beautiful work of 
+Marie Ota 
Before this photo was taken, Marie Ota couldn't get over her photographer's block, she was losing her concentration in photography and found the subjects of her photography were always out of her comfort zone, but then having heard of her G+ friend passed away, out of emotional burst she took this photo, and started her photography journey again.

I love the composition, the colors and the emotional charges of this photo but for some reason the story behind it touched me personally. 

Two interesting subjects I would like to write about today. The subject of photographer's block and the virtual friends.

Having snapped tons of photo, photographer's block will eventually come to you, like it or not, we are, after all, a simple human being. Living in this beautiful island, I usually seek inspiration from nature to overcome photographer's block. That usually means getting out of my comfort zone of taking photos from the neighborhood, exploring and getting lost on purpose. In digital world, I seek inspiration by visiting as many photographers as I can, and enjoy the beauty of their works. Thanks to the wonder of G+ and the many photographers that choose it as their launching medium, I feel like I am visiting many photo galleries and museums in a short period of time.

But social media has its price tag. 

To many of us, social media is becoming more and more inseparable from our life. G+ has reached more than one billion registered users. Like it or not, social media is here to stay. G+ makes it fast for you to circle a group of people and enables you to quickly enlarge your circles of friends. When I had less than a hundred followers, I enjoyed personal chats on science, on topics of creativity and other contemporary issues with the small circle of people I knew, and then I picked up the hobby of photography, before I know it, today, I have more than twenty thousands followers. All happen within a short period of a few months. With the limit of available on-line time, at the moment I think I am out of touch with so many friends I used to know, and couldn't really follow up on people who plus my posts, and lately I am lagging behind in answering comments from my friends. The problem with me is that, just like Marie Ota, I always think highly of my G+ friends. Unless proven otherwise, I have always had a positive views of the friends in my circle, after all I picked them to be in my G+ friends. I am still finding way to solve this one. Two things I would like to do to make up to this situation:
1. Re-share the work of my friends to show that I care
2. Sharing circle

Starting next week, I will re-share the works of my friend every Saturday, and re-share circle every Sunday. So if you read this far, and if you want to, feel free to include a link to your best work and include a short description of why it means so much to you in the comment.

Thank you!
見せたい風景 @札幌、円山公園
"There is a place I want you to see." / Maruyama Park, Sapporo, Hokkaido

昨晩はすごい雨でしたが、今日の札幌は青空がまぶしい! 清々しい風が吹く、今朝の円山公園での1枚です。


Google+ で知り合った大切な友人がお亡くなりになったことを、一昨日知らされた。お会いしたことも、お顔全体を拝見したこともないけれど、その方は「笑顔の似合う方」。病気、苦しいだろうな、痛いだろうな、と思ってはいるのに、どう想像してみても「笑顔」しか思い浮かばない。そういう関係だったのだな、と思う。





笑顔で送り出します。ありがとうございました ^_^
 ·  Translate
Add a comment...
Beautiful Sanur Morning

If you like my photos, please have a look at my Android apps

Tranquility and early birds - live wallpaper

Dazzlide - slideshow and live wallpaper
Dazzlide ースライドショーとライブ壁紙
 ·  Translate
Add a comment...
annarita ruberto's profile photoVicky Gallardo's profile photoYongki Citradi AndykaJong's profile photo
Add a comment...
mustika adnyana's profile photo
I like about tagline your life....we life in the small beauty island
Add a comment...
Once upon our time, a Jazz giant lived among us: Dave Brubeck 
Bill Carter's profile photoYongki Citradi AndykaJong's profile photo
+William Carter We have Jazz festival here every year, but could never invite giant Jazz musicians as famous as Dave Brubeck, I remember once in the late 80, I was travelling in US and I was asking about his live performances, couldn't get a confirmed date from my friends there, so I have never had a chance to see him performs live.
Add a comment...
Have him in circles
1,667 people
BEC BALI's profile photo
Young girl and the sunset sky 夕焼け空と女の子
A study of light in photography
Having been told about the components of light in computer programming, every time I take a photo, there are three components of light at the top of my mind: specular, diffuse and ambient lights. Specular light comes from a specific source and then reflected off from a shiny surface. Diffuse light is the soft quality light you see when a single direction light is being scattered off in all direction. The brightness of diffuse light depends on the surface facing the light source, it is at its brightest when the surface is directly facing the light and drops as it tilts further. The last one, ambient light, is the most important component of light for a photographer. It comes from no particular direction, it is the light that has been reflected off from many surfaces. Making good use of ambient light is the key to have a beautiful photo. 
Here is a photo of my little model at sunset (actually I would like to tell you about how hard it is to convince your daughter to be your model, but I guess that should be for another post). In this photo, the only source of light is the Sun. It is at the far right and out of the picture. The direct sunlight generates lots of specular lights (not captured in the photo), these lights are my usual favorites for making the golden, caramel and amber sunset shots but for this photo I am focusing on making use of the ambient light to take a clear photo of my little model. The diffuse lights are what make the beautiful sky and the decorative background wave.
In this photo, my camera settings were: f/16, 1/30s, ISO-100, 18 mm Lens. Hyperfocal focusing is at about one third from the bottom to ensure all the key elements are sharp. To get the necessary soft ambient light I waited for the wave to recede, so that the thin layer of the water could serve as reflector shedding light on the back of my little model. This was made possible by choosing the location where specular lights are abundant on the right. The white balance was set to shade to emphasize the sunset sky, custom adjusted a little bit to ensure the diffuse light was not too reddish and the shirt color was properly captured . I also selected the background to ensure the sky was not that bright but not too dark, I tried many combinations of aperture, shutter speed and ISO speed, the settings above gave me the result I wanted for this photo. I did try faster shutter speeds at lower aperture numbers, the waves generally looked much better as the results but the sky and the two holes formed by the arms of my little model ended up showing many distortions. 
Post processing is another topic I will be talking about, but for this one I used some filters and scripts of GIMP 2.8.
Ok, if you have read this far, feel free to comment, I seek discussion on the topic of light today if you are into it. Mostly, natural light is of my current interest.  
Add a comment...
 ·  Translate
Add a comment...
Interesting post from Novita Listyani
The Brahminy Kite (Haliastur Indus) once ruled the sky of Bali. Due to habitat loss and human greed, now the Brahminy Kite can only be seen in the mangrove swamps of Bali. Having spotted it occasionally, I have been trying to take photos of this beautiful bird in the wild, many months have gone by without a satisfying result so I decided to go to the bird park here and snapped this bird in flight and up close; just to satisfy my desire to have a close look at this beautiful bird  :)
It is a very beautiful bird, don't you think?
Add a comment...
"Simple and clear explanation about radioactive decay and how to use the half-life property of radioactive isotopes to determine the age of things" 
Coin Toss

Suppose you were given one million dollar coins.  Sure, you could spend it on something frivolous like paying off your house or your college loan, but could also use those million coins to play a game related to quantum physics. The rules of this game are simple.  Each round every coin gets tossed once.  Any coin that lands on tails gets to move to the next round.  Any coin that lands on heads is eliminated from the game.  Keep playing until you run out of coins.  I would call this game Half-Life, but since that's already been taken, I'll call it Coin Toss.

Assuming all of the coins are fair, each coin has a 50% chance of making the second round.  Any coin that makes it to the second round has a 50% chance of making it to the third and so on.  Even if a coin makes it to the 10th round (meaning it landed on tails ten times in a row) it still has only a 50% chance of making it to round 11.  The fact that a particular coin has survived all the past rounds doesn't make it any more or less likely to land on tails again.  Each coin is completely random, and we have no idea when any particular coin might land on heads.

On the whole, however, we can say some things about the outcome.  While it is (remotely) possible that all the coins survive the first round, that isn't very likely.  We can be pretty confident that about 500,000 of the coins will make it to the second round, about 250,000 would make it to the third, and so on.  It is very possible that 1 or 2 coins will survive to round 19.  Even though we can't predict the outcome of an individual coin, we can predict the collective outcome with a high degree of certainty.

Our confidence in the outcome is high enough that if we know the rate at which each round was played (say once a day, or once a week) we can count the number of coins still in play to determine how long ago the game began.  We don't have to know the exact outcome because we know the game and the rate at which it plays.  

In scientific terms we call this radiometric dating.  Some elements are radioactive isotopes.  They are unstable, which means they can decay into other elements over time.  We can't determine when a particular radioactive atom might decay, but we do know the half-life of radioactive isotopes.  Basically, the half-life is the rate at which they play the game.  Different isotopes have different half-lives, but they all play the same game.  With each half-life a particular isotope has a 50% chance of still being in the game.

Perhaps the most famous isotope is carbon-14.  This isotope is generated at a fairly constant rate when cosmic rays strike nitrogen atoms in the upper atmosphere.  Living things take in new carbon at a fairly regular pace, so they all have a fairly constant fraction of carbon-14.  When things die they stop taking in new carbon, and the fraction of carbon-14 decays with a half-life of about 6,000 years.  So we can measure the fraction of carbon-14 in something dead to determine when it was alive.

Of course this dating method gets less accurate as more and more rounds are played, and this means there's an effective limit to how far back we can date something with a particular isotope.  For carbon-14 that's about 60,000 years (or about 10 rounds of the game).  Other isotopes, such as uranium-lead dating can determine the age of rocks more than two billion years old (give or take a few million years).  

Radiometric dating can even tell us something about supernovas, but that's a story for another time.

Add a comment...
Computer Vision

If you're interested in learning computer vision, you might find the following resources useful:

1.     In this site you will find Computer Vision: Algorithms and Applications by  Richard Szeliski. This is one of my favorite book on computer vision, and it is free :)

This site of Dr. Simon J.D. Prince page has free book to download, Computer Vision:  Models, Learning, and Inference and also links to a number of additional resources on computer vision.

Dr. MUBARAK SHAH page with many resources on computer vision.
Carlos Torres's profile photo
Add a comment...
Have him in circles
1,667 people
BEC BALI's profile photo
Software Developer
Basic Information
Yongki Citradi
Lead developer of numerous mobile software, live in an island in the sun, blue sky, white sand and nice wave.

I am not selling or promoting anything here but occasionally you might find me ranting about my software.

I have civil and structural engineering as my educational backgrounds. I have deep interest in computer science, mathematics, physics, technology, cryptography, computer and human languages, environmental issues, photography, art and the impact of applied science or technology on society. If you share any of my interests, do circle me if you want to.

I am happily married to a wonderful woman and have a marvelous daughter.


Bragging rights
Survived Jakarta 5/98 riot, wrote the first torrent client for mobile phone, ... Happy and alive!
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Sydney - Jakarta, ID - Yogyakarta, ID - Medan, ID - Singapore - Hong Kong - Taipei
Contributor to