2011年4月19日星期二

Camera Obscura

Camera Obscura





- A very basic camera obscura is a device that produces an image of some of its surroundings onto a screen.

- It is used in drawing and entertainment, and its invention led to photography

- It is a box with a hole in one side, and light, bounces off a scene outside, and then passes through this hole and hits a surface inside the box , where the image is reproduced, upside down, but with color

- This idea wasn’t exactly new, because observations of this type of thing happening in daily life had been observed by the likes of Aristotle (300BC)

- The idea continued to be developed over many centuries by various inventers such as Anthemius of Tralles (6th century) who kind of developed the Hagia Sophia, and Roger Bacon (13th century) who realized it could be used for solar eclipses, and they continued to be refined and improved over hundreds of years.

- People would trace the image that was projected onto the screen, and this happened in camera obscuras that were the size of a room; technically not photography this was a start. Eventually the idea of film was incorporated into the camera obscura

- The Camera Obscura was eventually modeled into the camera like devises, and is credited with making the first photographs

- The Camera Obscura is still a style of photography used today because of the interesting images it produces
There have even been cameras, such as the hagia Sophia, that have been created with the intention of making camera obscura style photos 




The above image was frequently copied in such publications as Lardner, Museum of Science and Art,1855. Note the also common irregular depiction of scale between the artist and the camera obscura.







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My Camera Obscura

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back side

front side


And last, there is a cool video of camera obscura on Youtube:





2011年4月18日星期一

Amazing Photos!

http://www.flickr.com/photos/21553944@N03/sets/72157623005145284/show/

Please check more images of Wet Plate Process on Flicker!

:-)

Collodian Wet Plate Process


The collodion process is an early photographic process, which was replaced at the end of the 19th century with dry plates—glass plates with a photographic emulsion of silver halides suspended in gelatin. The gelatin had the effect of greatly increasing the speed of the plates enabling shorter exposure times.
The wet plate collodion process was still in use in the printing industry in the 1960s for line and tone work (mostly printed material involving black type against a white background) as for large work it was much cheaper than gelatin film.
The process is said to have been invented, almost simultaneously, by Frederick Scott Archer andGustave Le Gray in about 1850. During the following 30 to 40 years it was popular, and many photographers and experimenters refined the process.


2011年4月3日星期日

salted paper + photogenic drawing 2


Group Project: Color Rainbow

RED
ORANGE (RED + YELLOW)
YELLOW
GREEN (YELLOW + BLUE)
BLUE
DOUBLE BLUE
PURPLE (BLUE + RED)



Exposure for 10 mins

all the mixed color were turned white.
blue is the darkest.



My individual photogenic drawing:

Canson Watercolor paper
2% salt solution - 1 coat
12% silver solution - 2 coats

Object:
Glass Sculpture
Drawer Handles
Lamp Holders
Keys


















Exposure for 8 mins
The glass one (bottom right) didn't turn very well. Only a little lines could be seen on the paper. Maybe try a glass piece with flat bottom next time and see if that would be works...