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Digital photography jargon r is for.....
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When you capture a digital image, each photosite (pixel) on your the image sensor records the intensity of light to which it has been exposed. This is converted into an electrical charge which is then amplified and converted into digital data by the cameras processor.
At this stage the
digital data corresponds most accurately to the original image and
carries the maximum possible information. This native image data is
known as RAW .
RAW data requires further processing for conversion into universally recognised formats (eg JPEG, TIFF etc) prior to printing or display.
Generally during this process, other image attributes are also established, enhanced or modified – e.g. White balance, colour saturation, contrast and sharpness.
Most budget compact
digital cameras will perform this conversion directly “in camera”
and the RAW image is replaced by the processed JPEG
Higher level compact
cameras and Dslrs normally give the photographer the option to retain
the data in original RAW format, or process “in camera” to
JPEG or to save the image in both RAW and JPEG versions.
For full details on the the pros and cons of RAW vs JPEG formats, please see the article RAW vs JPEG.
The “rule” of thirds is an aid to composition.
The idea is that photographs may often be aesthetically more pleasing when the primary point of interest - the so called “focal point” of the image is not centralised in the scene.
This is achieved by creating a grid which divides the frame into equal thirds both vertically and horizontally. The grid contains 4 intersecting points where the grid lines cross.
The idea is to position the focal point on one of these intersections.
Also with landscape (and seascape) photography, the composition may be more pleasing if the horizon is aligned to the top or bottom “third” rather than the centre of the frame.
It should be emphasised though, that there are no hard and fast “rules” and that the rule of thirds is simply a suggestion – and doesn't have to be used for every composition.
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