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Photography – Understanding Digital Image Formats
The images produced by digital cameras now rival the quality of our best types of photographic film. But the nature of a digital image shares almost nothing in common with analog image captured in a film emulsion.
An image captured on film is an incredibly complex physical object that has a life of its own, and can be interpreted directly by the inspection the human eye. A digital image, however, is an electronic representation of a scene – a sequence of numbers specifying red, green and blue light intensities required some software to do so in a visual form that can be displayed on a suitable imaging device such as a photo-printer.
When an image is captured digitally, is made with a patchwork of electronic pixels sensitive to light. These pixels are really independent square photodiodes that are arranged in the form of a tile surface large. Well, great from the point of view of a single pixel, as if it had been expanded with the pixel size of a tile kitchen floor, the area covered the full image sensor would be about the same as that of a football stadium.
A typical medium-resolution digital camera can have over 4000 pixels e arranged along one edge of its image sensor, and about 2500 on the other, it takes about 10 million pixels in general. The image sensor in this case it seems that have a resolution of 10 megapixels.
Now, when an image is recorded electronically, so each pixel on the sensor measurements is the amount of energy that gives birth to during the photo exhibition. Or in simpler terms, the brightness of the light. This great set of numbers is known as RAW image format. It is, in fact, the digital equivalent of film negative (or positive in the case of slide films), as it has all the information associated with exposure.
As it happens, you can not simply interpret these records RAW images in a color by numbers "type fashion. If you were to assign the color and brightness of each pixel corresponds to a pixel printed on a piece of photo paper or on a computer screen, it would be nice to see a representation of the scene that was photographed.
The reason for this is that the way our eyes respond to the brightness of color is different from electronic pixels respond to it. Our eyes are less sensitive to changes in the brightness of the pixels are electronic. Raw numbers need to be processed so that compensate for this difference.
What this means is that a large amount of numerical calculations need to be made to get the best result of our RAW image before to be printed in any form. This could be done inside the camera if you want to see immediately preview the result on the LCD of the camera. Or it could carried out by software processing complex images on your PC, once you've downloaded the image. Until then, the RAW image needs to be stored for later use.
Unfortunately, in the race to conquer the landscape of digital photography, digital camera manufacturers adopted an initial build for the first time to master philosophy and created their own versions of property of the RAW image format. An image of Canon RAW, therefore, has a format other than a Nikon RAW image of the same accurate picture. Due to the proliferation of RAW, the image processing software now has to compete against hundreds of RAW image formats. In practice this is not possible to Make Your image processing software (if it is a source other than the manufacturer of the camera) is likely to only support RAW format important, such as NEF for Nikon, Canon CR2 format and the format Fuji RAF.
This situation may improve over time, however. Adobe has jumped to the forefront of digital images through the publication of an open standard for RAW image formats of digital negative calls, or DNG. Gradually, camera manufacturers like Hasselblad, Leica, Ricoh and Samsung are building support DNG in their cameras, and hopefully the greatest players in the field will suit.
What this means, assuming that a standard like DNG is approved, is that when a photographer captures an image, stored in RAW format, and then forgets him for 10 years, they will not discover, when you have time to recover again, that your image format is obsolete and no longer is any software that can process the file into a viewable image and printable. For large companies with millions of images archived to preserve this type of problem is a logistical nightmare, and it is very expensive remain at the very top.
Eventually, a standard RAW format to ensure the integrity of image files, reduce headaches for photographers around the world by surprise, and save both time and money. DNG support is currently available in software packages like Adobe Photoshop and Photoshop Elements, and is likely to migrate to third-party software packages as the standard image embraced. Adobe also offers free Digital Negative Converter on your site that allows visionary photographers to convert its current RAW image format DNG version as well.
As mentioned, software is needed to convert an image in a RAW format that can be displayed and printed. This is analogous to the "development" to the process of negative film. The most common format display of images is JPEG (which means Joint Photographic Experts Group). The JPEG format is one that can withstand a great amount of compression, so that the image visible end is substantially smaller in size (number of bytes) that the RAW image file. This means you can easily send to others through e-mail for example. The JPEG format is also an industry standard image format, so the file can be opened and read by all software processing trade dress and a large number of software packages open source image.
Another standard TIFF image format. However, TIFF size files are generally larger than the equivalent JPEG image so they are used mainly by professionals who need to produce reproductions large print with high resolution. In fact, the DNG standard is based on a version of TIFF.
Several image processing algorithms are applied to RAW images to convert to a printable format. It performs the white balance, which is the means by which a cast is removed unwanted overall color of the image. When a color cast is present, a white object will be photographed by a white color component is left of the image fidelity. The image on your camera saves RAW likely to have a digital record of the white balance correction used when the image was created, but you are free to set the time to edit this image derivative RAW format.
It is important to note that when you are trying to create the image of the printer as well as possible, you need to start with the original RAW image file. Once a print version has been created as a JPEG version, the image processing algorithms applied are "thrown out" a lot image information that was deemed unnecessary. These operations are irreversible losses, and limit the remaining options to tinker with the image if it decides that the result is not exactly what you are after. The solution is to return to the RAW file format and start over.
Due to differences in the size of files are so big, if not the business of collecting RAW image files and process for the perfect image at a later date, you should consider allowing the camera to create JPEG images as the default, and ignore completely the RAW format. This will improve the responsiveness of the camera, because you do not have to store images Big RAW to your Memory Card. If, for example, you are photographing a sporting event, the frame rate when shooting in continuous mode will be greatly improved. In addition, you will be able to record a much larger number of images on your memory card before it fills up.
On the other hand, if you photograph something of importance, not to consider the consequences of not using RAW format for recording images. You may regret it later.
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About the Author
Stephen Carter is a web developer and creator of the product review script Review Foundry. He is also the creator of Best Digital Camera Discounts His interest in photography spans decades.
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