Thursday, December 18, 2008

Canon Digital Camera Basic Guide: Pixels

By Tim Harris

Buying a new Canon camera can be very confusing as there are so many terms that sound like a foreign language. In order to be able to make a good choice in your purchase of a Canon digital camera, you will need to know the meaning of some basic terms pixels, white balance, dpi and ppi. All these terms will in some ways affect the quality of the image that a Canon Digital camera will produce. In this guide, we will explain about what a pixel means and how it will determine the quality of the image.

The word pixel actually stands for the term PICTURE ELEMENT. All digital pictures taken by the Canon Digital camera are composed of pixels. They are, in reality, tiny squares with different colors mosaic together like a giant jigsaw puzzle to form a digital image. Although at a glance, this is not evident until you enlarge the digital image significantly. Only then will you be able to see the little squares of different colors and hues. The colors and hue of each pixel is represented by 3 numbers, one number for the red, green and blue color channel. These numbers each, ranges from 0 to 255. Taken all together, there are 16 million possible color combinations that can be represented by these 3 numbers.

Beside from using pixel counts for the display of digital images, nowadays, Digital Camera manufacturers also uses pixel counts to grade the capabilities of their digital cameras. Canon has digital cameras which range from 5 to 10 million pixels. They are normally classified as megapixels cameras because one mega pixels is equivalent to one million pixels. When we say a camera can take 5 megapixels pictures, this mean the digital image which the camera takes have 5 million pixels in it. The numbers of pixel a digital camera has is not important when the image is used displayed on a monitor. However when you need to print these images, the pixels do matter as the higher the picture count, the sharper and crisper the prints will be.

You need also to consider whether when talking about pixels counts that you are referring to "Total Pixels" count or "Effective Pixels" count. Total Pixel count refers to the fact that all pixels that we see in a digital image are counted. Because in the final digital image, the pixels at the edge of an image are not used. As such the actual pixel count will be less. Effective Pixel count refers to the count only after all these edge pixels have been discounted.

With a 5 megapixels Canon Digital Camera, you will achieve excellent picture quality prints of 5" X 7" prints. 8" X 10" prints will be off decent quality. However, if you are going to print more of 8"X 10" size images; it is recommended that you purchase a 8 to 10 megapixels Canon Digital Camera. - 16463

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