Chemistry and photos
“It is not only art; it
is science. Yes, it is old but antique.”
Behind
the taken photos are chemistry and physics. It is about photosensitivity and
light reactions; the point to be started with is the camera itself. Absorption
of photons and organic, and acid and base principles are
topics to be discussed. Photographic papers are made of silver salts, which are
the most photosensitive compounds, usually grains of silver halides, with a
gelatin emulsion. With the presence of light, these grains start reacting create
a latent image. Bromine is the most common halide used. As known about ionic
compounds, they exist in a crystalline form; thus, the silver halide grains made
of silver ions (+) and halides ions (-) in a lattice structure. Despite the
stability of the ionic bonds, there is some atoms and electrons moving
throughout the structure. Now, physics starts. The energy levels in the grain
differ by the concept of “electrons presence in the valence band and the conduction band”.
Colorful
photography:
Blue, green, and red are the colors, which responsible for the colorful
photos, combine resulting in the beautiful colorful photo, which is full of
life. The emulsions to these primary colors are important in
this process. Using a film contains three superimposed layers, each is sensitive
to one of the primary colors. The color sensitivity of the film layer appears,
as a result of silver deposition by the formations of a dye color, which is
associated with the film layer color sensitivity. Next, silver and silver
halides are removed from the three layers, and the image is color negative. With
similar layered emulsions, the negative is, then used to print a positive copy
onto paper.
Digital
photography:
Cameras
with no films; however, they have charge-coupled devices, CCDs, contain
millions of minute light sensors in rectangular arrays pattern. With light
exposure, an electric charge is produced by each sensor, then the enormous
information is stored electronically as digital data in the camera.
Comments
Post a Comment