Digital PhotographyA tool for Graphic DesignGraphic Design: Digital Photography
Digital CameraGraphic Design: Digital Photography A digital camera (or digicam)is a camera that takes video or still photographs, or both, digitally by recording images via an electronicimage sensor.
Graphic Design: Digital Photography The word digital comes from the same source as the word digit and digitus (the Latin word for finger), as fingers are used for discrete counting. It is most commonly used in computing and electronics, especially where real-world information is converted to binary numeric form as in ditigal audio and digital photography.
PixelGraphic Design: Digital Photography In digital imaging, a pixel, the smallest addressable screen element in a display device; it is the smallest unit of picture that can be represented or controlled.
Image SensorGraphic Design: Digital Photography An image sensor is a device that converts an optical image into anelectronic signal. It is usedmostly in digital cameras and other imaging devices.
Graphic Design: Digital Photography Today, the most currently used active pixel sensors are digital:
charge-coupled device (CCD)ORcomplementary metaloxidesemiconductor (CMOS).
A CCD image sensorGraphic Design: Digital Photography A CCD image sensor is an analog device. When light strikes the chip it is held as a small electrical charge in each photo sensor. The charges are converted to voltage one pixel at a time as they are read from the chip. Additional circuitry in the camera converts the voltage into digital information.
A CMOS imaging chipGraphic Design: Digital Photography A CMOS imaging chip is a type of active pixel sensor made using the CMOS semiconductor process. Extra circuitry next to each photo sensor converts the light energy to a voltage. Additional circuitry on the chip may be included to convert the voltage to digital data.
Focal LengthGraphic Design: Digital Photography Cameras have lenses on them to focus incoming light and direct it towards the image sensor at the back of the camera. Focal length in a camera can be best described as the amount of information that makes it to the sensor relative to the distance the subject is away from the lens.
Graphic Design: Digital Photography In camera terminology, light is measured in what are called stops. One stop represents the increment between one doubling and the next.
Exposure ControlsGraphic Design: Digital Photography Exposure is controlled by many different things.
Two of the most important ways to control the exposure are the aperture and shutter speed. Exposure is the amount of light that makes it to the sensor at the back of the camera.
ApertureGraphic Design: Digital Photography To control the amount of light that makes it to the sensor, a small opening is opened and closed on top of the iris called an aperture.Cameras let light in through an iris.
Depth of FieldGraphic Design: Digital Photography The Aperture also controls Depth of Field.
Graphic Design: Digital Photography depth of field (DOF) is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an imageDepth of Field
Graphic Design: Digital Photography Shallow Depth of Field
Graphic Design: Digital Photography Large Depth of Field
Graphic Design: Digital Photography http://www.youtube.com/watch?v=uzedefUXARE&feature=player_embedded#!
Shutter SpeedGraphic Design: Digital Photography The shutter on the front of the camera is a flap that opens and closes for small increments of time to allow light in. Because there is limited space on the sensor for light to be absorbed, the shutter has to be very precise in how long it is open for.
Graphic Design: Digital Photography By adjusting the shutter speed you can control the movement of your subject moving through your frame. Shutter SpeedA fast shutter speed will freeze the subject and a slow shutter speed will make it look blurred as the subject moves.
Graphic Design: Digital Photography 2000 1000 500 250 125 60 30 15 8 4 2 1 B fast------------------------------- slow ---------- shutter held openThese are the shutter speeds, expressed in fractions of seconds, that you will most commonly find on any semi automatic or manually operated camera.Shutter Speeds
Graphic Design: Digital Photography