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The quality of a digital image , depends by the number of pixels which are used to create that image . The maximum dimension for images capture is give by image sensor from camera . When an image size is modified in an image editor software or using camera , the size of photo is increase by adding additional pixels (pictures elements ) to that picture . If size of an photo (image) is increased very much the image become pixelizate but this effect can be reduced if the photo contains more pixels . If more pixels are used to show one photo the size of that photo can be increased much more. This effect which is generated be the number of pixels from photos it’s called pixelization . You can see in image presented below an original image size and one image resized 800 per cents . The resized image is a low quality and is affected by pixelizatilon . 
 Image size is give by resolution of sensor . Image resolution can be : -Optical resolution and ( from image sensor ) -Interpolated resolution ( from increasing resolution with software ; adding pixels to photo) If we use more pixels in photos the size of photo will be increased but we can obtain more quality pictures . In our days the technology is advanced and the images sensors from camera can capture the images in high resolution . The first number you will see in a digital camera description parameters is its megapixel rating. A pixel ( short for picture element ) is one of the thousands or millions tiny colored dots that compose a single digital photograph . One megapixel equals one million pixels . You can find this parameter at many devices for describing maximum and minimum graphic resolution rating ( resolution of pc monitors , lcd , photo camera , printers , scanners , video cameras and other devices ) The number of megapixels from camera’s sensor determine the quality of your pictures resolution ; the amount of detail that appears . For example a 8-megapixel camera has a better resolution than a 5-megapixel camera. The number of megapixels you need depends on how you will displaying taken photos. If you intend to print your photos your megapixel needs are considerably greater . For a printed digital photo to look as clear and smooth as a real photograph the colored dots must be much closer together on the paper150 pixels per inch or more (typically on computer display are 97 -120 dpi ). You can make an associations between megapixels and image size (width and high) using table bellow . | Camera Resolution | Max Print Size | | 0.3 megapixels (some camera phones) | 2.25 x 3 inches | | 1.3 megapixels | 4 x 6 inches | | 2 megapixels | 5 x 7 inches | | 3.3 megapixels | 8 x 10 inches | | 4 megapixels | 11 x 14 inches | | 5 megapixels | 12 x 16 inches | | 6.3 megapixels | 14 x 20 inches | | 8 megapixels | 16 x 22 inches | Many factors contribute to the quality of an image : lens quality, file compression, exposure, camera shake, paper quality, color cartridges . You can print your photos at low resolution but the picture become dotted and the quality is poor . How big it’s need to be the memory card ? On a digital camera you need an memory card ( card data ) to store your taken photos . The capacity of memory card that comes with most cameras is very low ( maybe you can take 20-30 photos on low resolution and 10 at high resolution ) . In this case you need to buy a bigger memory card . Why is most important to have a big memory card ? … because when you are in a long trip you don’t need offload at every 2 or 3 hours your latest pictures . Using this table you can make an associations between resolution of camera sensor memory card and number of pictures which you may shoot . | | | Camera Resolution | 2 MP | 3.3 MP | 4.1 MP | 5 MP | | Card Capacity | How many pictures? | | | | | 32 MB | 30 | 17 | 14 | 8 | | 64 MB | 61 | 35 | 30 | 17 | | 128 MB | 123 | 71 | 61 | 35 | | 256 MB | 246 | 142 | 122 | 70 | | 512 MB | 492 | 284 | 244 | 140 | | 1 GB | 984 | 568 | 488 | 280 |
Other factor with influence in the pictures size is the quality ; all cameras have three options for quality : normal , fine and superfine .
If you choose superfine the quality of picture is better than with fine setting but in the same time the size of picture is bigger. Another factor of size of pictures is the format of saved photos (jpeg , tiff , raw ,etc. ) . Most digital cameras capture photos in the JPEG format just some cameras offer you the chance to leave your photos uncompressed on the camera in what's called TIFF format. These files are huge in fact you'll be lucky if you can fit one TIFF file on the memory card that came with the camera. To be continued .
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