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Web graphics are not displayed at a higher resolution than 72 or 96 dpi. It is a good idea to design at a higher resolution in case you want a printed piece, then do a 'save as' and reduce the resolution for the web.
Yes.
DPI = Dots Per Inch. It refers either to the resolution of a computer monitor, or the resolution of a printer. The higher the number, the finer the detail that's either displayed or printed.
Abbreviated dpi. The number of dots that can be printed, side by side, along a line one inch long; a measure of the resolution of a printing device, printed image or image on an electronic display screen such that a greater number of dots per inch represents higher image quality.
Higher resolution on movies means that the picture will be clearer than on a movie with less resolution. So if you want a really good movie experience, go with the higher resolution.
Usually the more pixels you have, the clearer or higher the resolution you have.
resolution
Dots per inch. This is the number of tiny dots that the printer can put down in a space the size of an inch. The higher the number the better the resolution.
Megapixels (MP )are used to measure the resolution of photos taken with digital cameras. Therefore, the higher number of megapixels of a camera corresponds with a higher quality photo resolution. Typically, a digital camera with 16MP or higher is considered to be a high resolution camera. For the higher-end and more professional digital SLR cameras, 20MP or higher is considered to be a very high resolution camera.
Printing resolution refers to the amount of ink used on a square inch of paper. The DPI (dots per inch) setting for your printer will determine the quality of the image printed. With a higher DPI setting, there are smaller and more abundant dots on the square inch. More is not necessarily better, though. Certain media require certain printing resolution. For example, newspapers and other items printed on newsprint-quality paper require a bigger dot (lower DPI,) since the porous paper would bleed and look fuzzy with tiny dots. Your printing resolution, however, can only be as sharp as the image you desire to be printed. For more information on image resolution, look up PPI (pixels per inch.)
Normally, higher resolutions are always considered to be better. A higher resolution means higher quality images or video. There are some exceptions where higher resolution can be detrimental. High resolution means more data to store and transmit an image or a video signal. HDTV requires 5 times more data than standard definition signals. That means 5 times the storage space and 5 times the bandwidth for transmission. For storage, it means more disk space in an editor or a PVR. For transmission, it means a bigger part of the total cable or satellite bandwidth. The result is fewer programs stored or fewer channels. In some cases, older television content that was produced as SD is being boradcast in an HD format. The image quality doesn't get any better because the conversion never adds detail that wasn't there to start with. It does use the full HD data rate though. In this case, higher resolution doesn't mean higher quality. Sometimes, higher resolution just means running out of storage space faster or fewer channels. So, although high resolution is usually a good thing, there can be reasons why lower resolution might be better, just once in a while.
Depending on the type of camera (ie.. Kodak, Canon, etc...) yes your price will be higher. If you go with a cheaper camera that has less features but a higher resolution, that would be your best bet for finding a high resolution camera for a decent price.