Digital cameras & resolutionWritten by Jakob Jelling
By Jakob Jelling http://www.snapjunky.comWhile analyzing any camera, one of most important qualities of a photograph that a person seeks, is resolution. This word itself needs a brief discussion before progressing onto its implication upon a digital camera. This is a word that seems to almost every new photographer as a nightmare. With all myths and irrelevant information circulating all around, this is quite common. This however is an effort to clear those misty myths and provide good information for everyone. Without any complexity, generally a photograph, either viewed on screen or printed, is composed of infinitesimal dots (called pixels). The greater amount of these dots that can fit per inch of space, smaller dots and sharper image. This is basis of understanding ... resolution! Considering an image at 100 dots per inch that is one square inch in size. It is comprised of 100 X 100 pixels. Now changing this image four-times to four square inches. This image is quite clear. Now same 100 X 100 dots exist, but with only 25 dots per inch. The appearance becomes grainy. This is factor know as resolution that determines this quality of image. Hence it can now be interpreted by any person what importance of resolution is and where it is required in filed of photography. While purchasing a digital camera, resolution is a very important factor to take into account when settling upon buying a particular one. Digital camera resolution comes in as Mega pixels. A Mega pixel is composed of one million pixels. The greater number of Mega pixels, greater becomes standard of quality of photograph or picture. As a standard, one mega pixel is minimum bottom line below which a digital camera must not be usually purchased. This is a general decided value for any amateur photographers also, and exact value of higher mega pixels is not a concern for people who do not intend to print photographs. In an effort to scrutinize pixels in an image out of sheer anxiety, a person can magnify display in a photo editor, like a little magnifying glass, and they become very much visible!
| | Light and depth of fieldWritten by Jakob Jelling
By Jakob Jelling http://www.snapjunky.comWith such a fantastic device as digital camera for recreation of magic in arts, a lot of care needs to be taken so as to maintain perfection of end product. This perfection is not only obtained by artistic feeling of photographer but also with intricate knowledge of every minute aspect of medium of creation of art (in this case digital camera). And these minute aspects play a vast role in defining ultimate perfection. The digital camera, light and depth of field are one such factor that would come into light in this subsequent discussion. Basically, depth of field is a measurement of acceptable sharpness. Yet this is very strictly a personal preference, and varies from person to person. Thus to be more formal, depth of field can be defined as area inside an image that demonstrates an ample sharpness that can be considered more or less in focus. So depth of field is range of distance, measured along lens axis, as per which image is caused to be sufficiently well and sharp in photograph. The rest is as follows! The depth of field defines zone where all elements show clearly from foreground to background. Three factors control depth of field in an image, they are distance of subject, focal length, and aperture used to capture photograph. For people using compact digital cameras, one of subjects of out of ordinary interest is depth of field because depth of field is more easily said than done to control with a compact digital camera than with earlier conventional analog film cameras. The minute imaging sensors of compact cameras need use of short focal lengths, and this in sequence gives these compact digital cameras an extraordinarily long depth of field when compared to other cameras. Thereby, with intent obtaining a shallow depth of field is more complicated.
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