Digital Photography Basics - pixels and compression rate

July 11, 2011 - PRLog -- Digital camera pixels and compression rate is to determine the ultimate effect of the important factors that photo. Use a digital camera can freely choose a photo quality and image size, easy to take photos that meet the requirements of use. The following simple relationship between the two instructions.

If you want to give full play to the camera's performance, it is recorded using high resolution

The so-called digital camera records the number of pixels, it simply is to determine the size of the digital image. Typically, the larger the number the more able to capture more pixels to larger images. Film camera is the film to determine the size photo quality. The digital camera you can control the use of pixel sensors, with a camera can capture a variety of different size images. Typically, if you want to zoom in print, you should use a higher number of pixels for filming, with 12.1 million pixels, even if printed to A3 + size, photos will not appear jagged, able to maintain high quality. The low resolution is suitable for publishing on the Internet, or e-mail photos as attachments sent and so on. Therefore, their use should be based on the indiscriminate use. Note, however, if the low-resolution photographs to enlarge, then the slash will appear jagged, the overall picture will lose sharpness. In contrast, high-resolution photographs can reduce its size by the computer, etc., can be used for many purposes. Therefore, using the camera when shooting is usually the maximum number of recorded pixels. Choose the number of pixels as high as possible, but also to avoid the pains taken good photos because of lack of regret pixels.

Quality due to compression rate varies

Fine: even if enlarged, the details remain perfect. Therefore, the quality is sufficient to meet such large as A3 + size printing requirements. This mode is especially suitable for shooting landscape photos and other details of the performance of the pursuit. Of course, in the capture or portrait photography can gain satisfactory results. However, in this mode, the image data size is "normal" mode more than 2 times, therefore, recommend the use of large-capacity memory card.

Normal: As the image of the data capacity of less than "fine" mode to half, so when the encounter to take more pictures, but the memory card space is relatively small, we can use this mode to increase the number of shots. Quality and "fine (Fine)" mode is not much difference than if the print A4-sized photos can choose any of a pattern. If you want the image data size as small as possible and not for the use of large-size printing, select this mode would be more satisfactory.

Usually a "fine" mode shooting, according to the need to use "normal" mode

To reduce the data capacity of digital camera images are generally used JPEG compression technology, which enables a memory card recording as many photos. Without this compression, the data capacity of a picture will become very large, so that no matter how much capacity memory cards will soon be filled. Admittedly, the image will be compressed to some extent lead to lower quality, but with modern technology, the rapid development of image processing, due to compression caused by the quality difference is gradually reduced. However, after the details of the image to enlarge part of the cf, then he will find the "fine" mode and "normal" mode, the difference between. Low compression ratio in the larger data capacity to save the photos can be further reduced through post-processing, but the reverse process is difficult to achieve. For large prints without the case, a "normal" mode you can get a more satisfactory quality, but given the current market price of high-capacity memory card is relatively modest, it is recommended usually a "fine" mode to shoot , when faced with the card's remaining space is small, want to reduce image data size, etc., a "normal" mode to shoot.

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