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Overcome difficult obstacles in Digital Photography

But most photographs aren't just well-defined black and white boundaries - in fact, none of them are. So when faced with angles, gradients, or irregular shapes, the computer has to use its stored rules to guess what color the new pixels should be. In theory, the better routines allow the computer to do a pretty good job at smoothing out the image when the resolution is increased and all those new pixels are put in place. In practice, unlike in the movies or on TV, you can't get information out of a picture that isn't there. That tiny black dot on the horizon isn't going to turn into an umbrella when you double the resolution, it will just be a bigger black dot. So if you need a "bigger picture" than you have, why not use interpolation? The trick is that the interpolation done in your camera is not the same as the interpolation done in your computer's editing software.

You can use your photo editing software or even many picture viewers or dedicated programs, to view and copy EXIF data. It can also be used by specialized software provided by the camera manufacturer when loading pictures into your computer to record information about camera settings and even provide editing options. One of the things these transfer programs can do is to change the timestamp of the newly created file to match the time the photo was taken. That's another good reason to set the clock on your camera to the correct time. This data can be used to record a log of photographs for a variety of purposes. The time a favored shot was taken may be referred to later in duplicating light conditions. You can keep track of settings for experimenting with changes in settings, and never get your pictures mixed up because the data is stored as part of the file itself. You can export or copy the EXIF information and not have to manually enter information in your log.

What is it that is actually capturing the image? Where film cameras have a roll of film exposed behind the aperture, digital cameras have a sensor. Most digital cameras use an array of photo sensors under a filter matrix which results in the sensors each recording red (8-12 bit), green (8-12 bit) or blue (8-12 bit) light intensities. These separate sensors or channels create what is often referred to as the Bayer matrix pattern where every other sensor records green with the alternating cells recording in red or blue. Each pixel in a conventional sensor only captures one color. This data is typically 10 or 12 bits per pixel, with 12 bits per pixel currently being most common. Most cameras now provide the option to instantaneously store the captured material in a RAW file while alternatively the camera's processor can weave the RAW data using all three color channels to provide an instant 24 bit full-color JPEG or TIFF display image. RAW is not an abbreviation but literally means "raw" or "unprocessed". A RAW data file contains the original image information as it comes off the sensor before in-camera processing so you have a variety of choices in processing the data on your PC using one of many editing software programs available.

When discussing image quality for digital photographs image noise is the equivalent of film grain for analogue cameras. Despite the fact that we are working in a visual instead of an audio medium, it is called noise, which is analogous to the subtle background hiss when a television channel has no broadcast or your audio system is turned up at full volume without a record or disk. In digital images, noise refers to random specks on the surface of a photo, which can degrade the quality of the image. While noise is often seen as a distraction and detriment to a photograph, it can be a desirable condition for certain artistic effects. Noise varies with sensitivity settings, length of exposure, temperature, and different camera models. The signal to noise ratio (SNR) is a useful and universal way of comparing the relative amounts of signal and noise for any electronic system. ISO setting or ISO speed are the standards, which describe a camera's sensitivity to light. A camera's relative sensitivity to light is represented by the ratio of the two ISO numbers. In terms of practical application, a photo taken at ISO 200 will take half as long to reach the same level of exposure as a photo taken at ISO 100 where all other settings are the same.

For the photographer that has a tight budget, it's good to know that there are free resources out there! If you take digital photos, then you can use some great editing software that is absolutely free, made available by Windows. Editing your pictures is a very important step in the photographic process, and can end up costing a pretty good amount of money by the time you are done. Anyone that needs to save money can take advantage of some great editing programs that are free and easy to use! Almost all digital cameras purchased today have a photo editing software program that comes as part of the purchase. These can provide simple cropping and picture modification. One of the many free photo editors offered by Windows is Paint.net. It is offered by Washington State University. You can freely download this freeware and use it to edit your own digital photos. The software has a ton of really cool features, including special effects! It is easy to use and you can even log onto a user forum, if you should need any help or want to see how others are using this great freeware! Another user-friendly freeware program that you can download to edit your photos is VCW VicMan's Photo Editor. This freeware is similar to Adobe's Photoshop. This software has a limited free version, but you can purchase the software for a great price. If you take a little time, you can find it offered at many online merchant websites and can even stumble across some great discounts!

Most experts will tell you what the automatic flash built into many digital cameras can't do - change light angle, redirect off surfaces to soften the effect but what is such a flash good at? As it turns out, there are a few times when such a feature is quite handy. While it can be handy to have dedicated lighting, or even a slave flash unit linked to your camera, there are good reasons why such items do not come standard with most cameras. Fill flash (also known as "forced on" or "anytime" flash) is a feature found on most digital cameras that allows the user to trigger the built-in flash whenever a picture is taken - no matter the light level. This is handy when natural light is behind the subject, but also to fill in shadows anywhere in the frame. While your eye can see the detail in these shaded areas, often the camera cannot. Many outdoor pictures are spoiled by excessive shadow or loss of detail when natural light seems adequate to the eye.

The good news in the world of memory cards for digital photography is that new media is cheaper, faster, and more readily available than ever. The abundance of choices means you can always find a method of storage that fits your needs and budget, and you'll likely not end up with a camera that you can't find storage media for. Most of the time you choose your memory card based on which camera you have, and then you're more interested in size and brand than technology. When you're shopping for a new camera, however, you want to take memory type into account. That being said, here's the latest news on the available choices. Multi-Media Cards (MMC) are definitely worth looking out for. Developed as a royalty-free standard, anyone can make the cards or the devices that support them. As an added advantage, the full-size MMC cards can be used in SD card slots. As a disadvantage, the standard is growing - in the sense that there are now five versions of the MMC standard with different sizes, voltages and features, in use. So watch your eBay purchases carefully. Available in sizes up to 2 Gigabytes

By: David Peters

Get rid of difficult obstacles while learning digital photography Avoide annoyances with printers, and get help with this free of charge report.

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