The camera’s metering system will sometimes determine the wrong exposure value needed to correctly expose the image. This can be corrected by the “EV Compensation” feature found in prosumer and professional cameras. Typically the EV compensation ranges from -2.0 EV to +2.0 EV with adjustments in steps of 0.5 or 0.3 EV. Some digital SLRs [...]
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Exposure
August 7th, 2011 
Andrei The exposure is the amount of light received by the sensor and is determined by how wide you open the lens diaphragm (aperture) and by how long you keep the sensor exposed (shutterspeed). The effect an exposure has depends on the sensitivity of the sensor (ISO sensitivity). The exposure generated by an aperture, shutterspeed, and [...]
Auto Bracketing
June 7th, 2011 Andrei Autobracketing is a feature of some more advanced cameras, particularly single-lens reflex cameras (SLR), where the camera will take several successive shots (usually three) with slightly different settings. Later, the best-looking pictures can be picked from the batch. When the photographer achieves the same result by changing the camera settings between each shot, this is [...]
Aperture Priority
May 23rd, 2011 Andrei Aperture priority, often abbreviated Av (for Aperture value) or A on a camera mode dial, is a setting that allows the user to choose a specific aperture value while the camera selects a shutter speed to match. The camera will ensure proper exposure. This is different from manual mode, where the user must decide both [...]
Aperture
May 16th, 2011 Andrei Aperture refers to the size of the opening in the lens that determines the amount of light falling onto the sensor. The size of the opening is controlled by an adjustable diaphragm of overlapping blades similar to the pupils of our eyes. Aperture affects exposure and depth of field. Successive apertures halve the amount of [...]
AE Lock
May 14th, 2011 Andrei Auto Exposure Lock (sometimes called AEL) is an excellent method of gaining added control over exposure, without losing the speed and convenience of automation. In fact, since most photographers today use some form of auto exposure the majority of the time, an understanding of how AE Lock operates can add a new dimension to their [...]
RAW Images
March 23rd, 2011 Andrei A RAW file contains the original image information as it comes off the sensor. No in-camera processing is applied. This will be done afterwards on your PC with special software. TIFF file only retains 8 bits per channel of information but it will take up twice the storage space because it has three 8 bit color [...]
JPEG
March 21st, 2011 Andrei The most commonly used digital image format is JPEG. It is universally compatible with viewers browsers, and image editing software, it allows photographic images to be compressed up to 10 to 20 times compared to the uncompressed original with very little visible loss in image quality.
Interpolation
March 7th, 2011 Andrei Interpolation is an imaging method to increase or decrease the number of pixels in a digital image. Many compact cameras uses interpolation to produce a larger image than the sensor captured or to create digital zoom. Almost all image editing software support one or more methods of interpolation, the quality of the final image and [...]
Histogram
March 4th, 2011 Andrei As we’ve talked in the previous topics about sensors and pixels, each photo is composed of a number of pixels. Each of these pixels have a certain level of brightness, ranging from 0 (black) to 255 (white). A histogram is a graphical representation of these levels of brightness for the entire photo.
