Digital Zoom (Digital Zoom).

Optical zoom camera by the camera lens in the minimum and maximum focal length to choose between. .And quasi-professional consumer digital camera with digital zoom is often also the following, we had a 500 million pixel digital camera quasi-professional pictures are, for example, talk about the digital zoom. .A, with scenes shot in 31mm B, with a 50mm focal length lens to shoot the scene from the camera 31mm <P> optical zoom in the camera lens are the minimum and maximum focal length to choose between. .And quasi-professional consumer digital camera with digital zoom is often also the following, we had a 500 million pixel digital camera quasi-professional pictures are, for example, talk about the digital zoom. .</ P> <P align=center> </ P> <P align=center> A, scenes shot with the 31mm lens </ P> <P align=center> </ P> <P align=center> B, .with a 50mm lens shooting scenes </ P> <P> change the focal length from 31mm 50mm (50/31 = 1.6X optical zoom), we see pictures of the scene covered smaller. .In Figure B, the red box area is A scene graph. .In the two pictures, the camera will be 500 million pixels of photographic record of the 500 million pixels of information. .</ P> <P align=center> </ P> <P align=center> C, 1.6 times digital zoom, the resolution dropped </ P> <P align=center> </ P> <P align=center> .D, 1.6 times digital zoom The images </ P> <P> 1.6 times digital zoom the image will only be used after the 1,600 x 1,200 pixels of information, and discard the rest of the information (2,560 / 1.6 = 1,600 and 1,920 / 1.6 .= 1,200). .In Figure C, the size of the camera to capture the scene with the map A is the same, but Figure C is only used in 500 million to 200 million pixels pixels! .If the digital camera has a resolution of 1,600 x 1,200 of the shooting options, photographs will be saved as a 200 million pixel image. .So we see that through the digital zoom the map after the D, there are only 200 million pixel resolution, clarity has declined markedly. .In the digital zoom, the camera image processor does not create additional information, so the image quality Figure D Figure B was significantly lower than that. .</ P> <P> in the end whether we should use the digital zoom? .? .</ P> <P> Since the digital zoom through the image quality will be obvious after the drop, then we should also should not use it? .If your goal is to obtain the image information in Figure B, use the 50mm focal length of course is the best choice. .But if your camera is only 31mm (or if you have the optical zoom lever pulled the telephoto end, but you want to zoom even further), you can have the following three options: </ P> <P> <1> .; we recommend the practice of the digital zoom off to the highest pixel camera shooting, shooting and then as you need to repair the computer, to enlarge image. .</ P> <P> <2> If you have a 500 megapixel camera output 200 megapixel image option, put the digital zoom to open, use 1.6 times digital zoom. .1,600 x 1,200 resolution of the photos will be saved to memory card, and photos of this 200 million pixels to record a 200 million pixels of information. .</ P> <P> <3> We do not recommend using the most 1.6 times digital zoom, while the 500 million pixel output. .Because at that time not only takes up more memory card space, and adjust the latter part of output pictures is greatly reduced. .We can imagine: to 200 million pixels of information (Figure C) Zoom into a 500 million pixel images (Figure D), how bad effect. .</ P> <P> Finally, we should keep in mind when using digital zoom point: the digital zoom does not create camera can not capture the details, digital zoom imaging and imaging optical zoom can not be compared. .</ P>.