Kategoriarkiv: Photography

Wikipedia och fokus

Har lekt lite med att göra några närbilder med en teknik som kallas ”focus stacking”. Är inte säker på vad en bra svensk översättning kan vara, men i alla fall så innebär det att man tar många bilder på ett objekt där man bara ändrar fokuseringen mellan varje bild och därefter slår dem samman för att få skarpt fokus över hela bilden. Annars när man tar närbilder så är skärpedjupet mycket kort, bara någon millimeter. Man kan visserligen använda en liten bländaröppning, men det hjälper inte så mycket på extrema närbilder, dessutom får man då problem med diffraktion. Det finns mjukvara som gör ”focus stacking” enkelt, jag använde mig av Zerene Stacker.

Här är två bilder jag la till på Wikimedia Commons:

Timjan
Timjan
En tablett till diskmaskinen
En tablett till diskmaskinen

Bilden på tabletten var mitt första försök så den har några tydliga misstag om man ser efter, bilden på timjan blev mycket bättre. Men det tar lite tid, att använda stativ är ett måste, dessutom gärna en fjärrutlösare (eller timer) och att använda sig av ”mirror lock-up” för att undvika vibrationer som annars ger ganska tydligt sämre skärpa.

För övrigt så noterade jag att engelska wikipedia nu har ca 2980000 artiklar, alltså bara 20000 till så finns där 3 miljoner artiklar. Antalet aktiva användare (personer som gjort en redigering de senaste 30 dagarna) är över 147000 st.

17 mai 2009

Mycket soligt och fint i år på nationaldagen här i Norge. Här är några bilder:

Trångt på Karl Johan
Trångt på Karl Johan
Thorbjørn Jagland vinkar från Stortinget
Thorbjørn Jagland vinkar från Stortinget
Barnetåget
Barnetåget
Karl Johan
Karl Johan
Kungafamiljen
Kungafamiljen
En blå gutte-russebuss, Christiania
En blå gutte-russebuss, Christiania
En jente-russebuss, DiVali med Indiskt tema
En jente-russebuss, DiVali med Indiskt tema
Salut på Akershus festning
Salut på Akershus festning
Aker brygge
Aker brygge

Nytt objektiv

Skaffade ett nytt objektiv till kameran idag, har inte hunnit testa det så mycket ännu men tog några bilder på vägen hem. Köpte ett Sigma 50mm F1.4 EX DG HSM. Det lönar sig verkligen att titta i flera butiker, 1000 kr i skillnad på priserna i de två butikerna jag hittade som hade objektivet.

Ett objektiv som lämpar sig för porträtt; inte för att jag har så många att ta kort av men jag hittade i alla fall några statyer som ställde upp 🙂

På vägen hem såg jag ett hus där de boende hade hängt ut banderoller i ett område där det förekommit mycket försäljning av droger. Jag har själv blivit erbjuden att köpa när jag gått här tidigare, men nu såg jag inga försäljare så det verkar som det har hjälpt. Men de har väl bara flyttat nånannanstans antar jag, men det blir i alla fall trevligare att gå ned till centrum nu. Men det är sorgligt att det är så mycket droger i Oslo, längre ned i centrum står det alltid en stor samling med narkomaner.

På banderollerna står det: "VI BOR HER, VI SER DEG. IKKE KJØP DOPET DITT HER!"
På banderollerna står det: ”VI BOR HER, VI SER DEG. IKKE KJØP DOPET DITT HER!”

Wroclaw, Popcorn Hour

Recently I visited Wrocław in Poland. This was a short work trip so I did not get very much time for other things. I took some photos one day after work. On my last evening I planned to see some more and take some more pictures but unfortunately it started to rain. Anyway it’s a very nice city I think.

Some more images here.

To something completely different. Last week I got my projector back after being repaired so today I bought a Popcorn Hour media center. It’s a small box that you can connect to a hard drive and your network so you can watch movies or listen to audio from those sources. As I have a HD ready projector this was the first time I have tried to watch 720p material, and it looks really great The user interface feels a bit slow but not that bad, and this media center is not so expensive compared to the alternatives. It seems to play most formats even though I have found some files that did not play. Also I got use for one old hard drive that was just lying in a drawer.

Photo Weekend

Last weekend I was out photographing a bit again since I got my camera back from reparation. I went up to holmenkollen:

This panaroma has many flaws, but it gives a nice overview. I also saw some people skijumping into the water:

After that I went up towards frognerseteren, I tried to make a very thorough panorama on one of the houses here in the image, but when done I realised that I had used a stupid setting on the camera and as I was quite hungry so I did not bother to redo it.

I walked down to Slemdal and took the subway back home.

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Slides (dia bilder)

As I a number of weeks ago bought a printer that can scan slides (or dia bilder in Swedish) my parents have sent me some old slides to scan. It’s fun to see those old images again that none of us have seen for many years. Also getting them into digital form will preserve them better and there is a good opportunity to enhance them. There are many under or over exposed images that can easily be fixed on a computer but as a slide they always looked really bad.

Below is one image of me (to the left), my brother and my father 23 years ago, time flies.

This image was horribly over exposed, but now look rather good.

Spring, Opera and sneezing

It’s now really nice and warm outside. Unfortunately I sat mostly inside at the computer this weekend doing some programming and other stuff. However I did take a walk down to the new Opera building here in Oslo and took some images. It looks very nice. Not very cheap however, I read in the newspaper that around 4 billion NOK of tax money was used to build it. The same newspaper also mentioned that 8000 people from 700 different companies were involved in the building process. On saturday when I was there it was very crowded, you even had to stand in line on the small bridge over the road as it was so crowded in the staircase.

At the computer I tried to find a good way of drawing uml class diagrams in svg on linux. After testing different alternatives such as gaphor and umbrello I ended up using the old classic Dia. Gaphor was terribly buggy. Umbrello is ok, but it could not export proper SVG so I gave up on that too. Maybe there are nicer tools for this that I have not found ? Dia at least exported usable SVG after some tweaking of the fonts used.

Outside in the sun I immediately sneezed because of the bright light. I have sometimes wondered about this strange reflex but never cared to look it up. But now I did (on the net) and apparently it’s a genetic thing. However scientists do not know exactly why this happen for some people, except that the connections in the brain are a bit crosswired between the reflex that should close the iris and the sneeze reflex. I am not very bothered by it though. Also sneezing seem to be something that is not really needed in it’s current form in humans at all. Because it is thought that sneezing is supposed to clean out the nose to expell bacteria, pollen, virus and dirt. However humans sneeze almost completely with the mouth instead of the nose in contrast to other mammals. Check your dog or cat next time they sneeze, apparently they sneeze only with the nose (which is the proper and useful way of sneezing). So apparently it is a bit pointless to sneeze at all, and to sneeze when looking at the sun is then even more pointless :-). According to the report I found on the net around 20% of the Swedish population have this sun-sneeze reflex, I found that surprisingly high as I can’t recall having met someone else that have mentioned beeing affected by this, but then again I have never asked. And to be precise it’s not the sun in itself that causes it, for example if I have went to bed and been lying in the dark for some time and then decide to go up and turn on the computer; the bright light from the monitor is usually so bright that I have to sneeze :-).

Camera test images and BW photography

To learn more about the behavior of my camera equipment and to see it’s various advantages and disadvantages in various situations I have made a few test images.

If you are interested in such tests (most of them are made on a Nikon D300), just check the images and read the descriptions. They are quite simple as I just made them for myself at first, but maybe someone else is interested.

The new Opera building

I took a walk down to the city today and I also walked past the new Opera building. Not the one I work in though 🙂 It looks quite finished at the moment, though there are still a lot of construction all around the area. I guess it will look really nice when it’s finished. The building itself already looks nice.

Image Stacking

I experimented with a technique called ”image stacking” for removal of noise. And this image shows a crop of the stacked image to the left and one unprocessed image to the right. And as can be seen it’s a significant improvement, and unlike normal noise removal filters this can actually increase the details in the image. This stack was created from 10 images which were all handheld at ISO 6400. I used the burst mode to get them as quickly as possible while trying to keep the camera in the same position. Then the resulting image is simply the median of the 10 images. The result was actually better than I thought.

Useful if you are in a situation where it’s dark and you can neither use flash or tripod.

By the way, larger versions are available on flickr by clicking the image.