Screen Cover Nikon

Screen Cover Nikon

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 be assigned 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 the pixels respond electronically to it. Our eyes are less sensitive to changes in the brightness of the pixels are electronic. Raw numbers need to be processed in a manner that compensates 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 being printed on 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 be done through 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 a first build for the first time to dominate the philosophy and created their own proprietary versions of the RAW image format. An image of Canon RAW, therefore, has a different format from a Nikon RAW image the same exact image. Because of the proliferation RAW format, the image processing software now has to compete against hundreds of RAW image formats. In practice this is not possible, so your software image processing (in the case of a supplier other than your camera manufacturer) is likely to only support the major raw formats, such as NEF Nikon, Canon CR2 format and the format Fuji RAF.

This situation may improve over time, however. Adobe has jumped into the arena of digital images by publishing an open standard for RAW image format digital negative calls, or DNG. Gradually, the camera makers like Hasselblad, Leica, Ricoh and Samsung are building support DNG in their cameras, and hopefully the greatest players in the field will follow.

What this means assuming that a standard is approved as DNG is that when a photographer captures an image, stored in RAW format, and then forget about it 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 render the file in a visible 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 to stay at the very top.

In long, 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 are likely to migrate to third-party software packages such as standard image embraced. Adobe also offers free Digital Negative Converter on your site that allows photographers to convert vision its current RAW image format DNG version as well.

As mentioned, software is needed to convert a RAW image into one that can be viewed and printed. This is analogous to the "development" to the process of negative film. The most common format is JPEG image viewing (meaning Joint Photographic Experts Group). The JPEG format is one that can withstand a great deal of compression, so that the final viewable image is substantially smaller (number bytes) that the RAW image file. This means you can easily send to others via e-mail for example. The JPEG format is also a industry standard image format, so the file can be opened and read by all image processing software business and a large number of software packages open source image.

Another standard TIFF image format. However, TIFF file sizes are generally larger than those of equivalent JPEG images, so are mainly used by professionals who need to produce large-print reproductions with high resolution. In fact, the standard DNG is based on a version of TIFF.

Several image processing algorithms are applied to RAW images converted to a printable format. It takes place white balance, which is the means by which a cast is removed unwanted overall color of the image. When a color cast is present, an object photographed by white made with a white color component is left of the image fidelity. RAW image stored in your digital camera will probably have a record of the balance correction White used when the image was created, but you are free to set the time to edit this image derived from the RAW format.

It is important to note that when you is 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 was created as a JPEG version, the image processing algorithms applied are "thrown out" a large amount of 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 RAW file format and start over.

Due to differences in the size of the files are so big, if not the business of collecting image files RAW and the process for the perfect image at a later date, should be considered to allow the camera to create JPEG images as the default, and ignore completely the format RAW. This will improve the responsiveness of the camera, because you do not have to store large RAW images 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. Also, you will be able to record a much larger number of images in your memory card before it fills up.

On the other hand, if you are shooting something important, not to consider the consequences of not using RAW format for recording images. You may regret it later.

To help you choose a suitable digital camera to get started, I met an article for you about find the digital camera for beginners .

If you need a simple model of point and shoot Digital Slr or a more complex model, find answers, and heavily discounted offers digital camera,

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.

Nikon D40 Changing focus screen.