Saturday, June 04, 2005

Digital camera interpolation explained by Jakob Jelling



In a device such as a digital camera it is very important to understand the very basic aspects of the device so as to properly operate it and give it the due respect it deserves. Such a topic is interpolation! These are accessories that help the digital camera to perform the technologically advanced features that it is capable of. In extreme explanatory and simple terms it can be summed up as that interpolation refers to software programs that can effectively enlarge image resolution beyond the actual resolution by adding extra pixels using complex mathematic calculations. Now, this is a feature that can be absolutely useful in providing a good success to a user.

Looking into the technical aspects it can be stated that interpolation is a technique where the spatial resolution of an image is increased from its original size to a higher or larger resolution. The spatial resolution of an image is simply its horizontal x vertical pixel count. For example 1600 x 1200. Again getting into further intricate details it can be stated that there are two techniques of interpolation commonly used, they are software and hardware. Again software interpolation can be performed on a digital image using a one of a number of image editing programs such as PhotoShop. This is often termed as resizing and is done with a computer, performed on an image file from a digital camera that already exists in a file format such as JPG. Hardware interpolation involves the resizing of an image, but it differs from software interpolation in that the image is resized algorithmically inside the camera during the image processing sequence and before the image has been saved as a JPG image file.

Also, it can be noted here that JPG is a compressed image file format. Whenever a file is saved as a JPG file, image data is lost in the compression process. Image data is thrown away in exchange for file-size efficiency. Software interpolation is a process performed after the JPG losses have been applied. Hardware interpolation occurs inside the camera prior to JPG compression and before JPG losses have been applied. The resulting hardware interpolated images are of superior quality to a comparable image interpolated in software.

These are basically the important points as discussed in the above lines regarding the digital camera interpolation. The explanation is worth for every user who can be a novice as well as an expert and thus uncovers another great feature of a digital camera, the process of interpolation.
About the Author
Jakob Jelling is the founder of http://www.snapjunky.com. Visit his digital camera guide and learn how to take better pictures with your digicam.

Photographing Kids by A.Charlotte Riley



Kids grow up so quickly and while we are often left with countless memories, most parents have only a drawer packed with school photos, blurry holiday snaps and the forced grin of the inevitable yearly birthday picture to account for the years gone by.

Its time to stop bemoaning the latest photograph of your thumb obscuring your adorable baby and get on with improving your skills as a photographer.

Why should you bother when the near-by mall has a perfectly good photo studio, you ask? Photographing children poses specific challenges but yields numerous rewards.

While it can be frustrating when you miss that spontaneous moment, it is also highly satisfying when you manage to capture the joy in their faces as they dance in the summers first sun shower. Capturing the day-to-day moments will provide a treasure trove of memories that you will cherish forever.

As well, your own images take on a more personal feel and a more meaningful connection, something that can never be achieved in a generic mall photography studio.

Follow these easy steps and immediately improve your snaps of the kids.

Making The Unusual Usual

Friends with children often say to me My child always pulls faces for the camera and I cant get a picture without little Johnny sticking his tongue out and crossing his eyes. Kids --and many adults as well-- are prone to hamming it up for the camera, however, they will be more natural if the camera is a part of their everyday life instead of brought out once or twice a year. By making it a regular part of their lives, it will increase the comfort level and encourage portraits that are more natural. Try bringing out the camera once or twice a week and focusing it on your kids. They will become accustomed to having it around and it will give you a chance to practice your technique, too. And, if they still clown around for the camera, get into the swing of things and enjoy it. Little monkey faces are a part of childhood!

Kids Eye View

As adults, we look one another in the eye and photograph our friends at eye level. Do the same for your children. Bend down on one knee or sit on the floor to get a picture that reflects a childs perspective. To add a little excitement, have fun playing with perspective by shooting the image from the ground up. Lie down on the ground and taking a picture from that viewpoint. Suddenly toddlers become giants and we can witness the world as they see it, by looking up.

Patience, Patience!

Small children have a limit of two or three minutes before they become bored with Mummy or Daddys photo session. The urge to run off and play becomes just too much! Dont force kids to stay in one place for long, unless you like pictures of sullen little faces. If you are taking a formal portraiture-style photo be sure to plan ahead for the best possible results. Check your batteries, make sure there is film in the camera and if you are using a digital camera see that there is space on the memory card. Provide your toddler or small child with a prop, like a ball or a favourite toy to help create a more natural expression, instead of the one that says, Just hurry up and take my picture, Mom! Keep it fun and stress-free.

Fill The Frame

Because backgrounds can sometimes be distracting, do not be afraid to move in closer and take a picture of your angels face. It creates drama and interest in the photograph and eliminates extra clutter. Unless you are taking a travel photo or an image of the child engaged in a particular activity, feel free to emphasize the most important element of the picture- your child. Use the zoom or macro tool on the camera to get in closer. Pictures of your little ones hands or feet can also be interesting studies, and one day you may find yourself saying, I cant believe they were so tiny!

Just A Little Off-Centre

Many professional photographers use The Rule Of Thirds approach which means that they mentally divide the frame into three sections both vertically and horizontally --like a tic-tac-toe grid-- and place the subject of the photo at one of these intersecting points. It helps to create a more dynamic photograph, than one where the subject is smack-dab in the middle. Take note that if your camera is an auto-focus model, you may have to focus first on your subject and then, with the shutter button still half-pressed, recompose the image.

Natural Light Rules!

One of the tricks of the trade in photography is to use morning or late afternoon light. The sunlight at this time is wonderful and helps to produce pictures that are bathed in warmth. Direct light flatters the subject and adds to a more intimate and natural-looking photograph. It also helps to greatly reduce the bane of every parent photographer- red eye!

Experiment with taking advantage of the sunlight pouring through a window, or march the kids outside on a sunny day and photograph them while they are playing tag.To have a well-lit photograph make sure the light is behind you, shining on the subject. To create drama, try using side light for impressive shading. If you try to take a photo with the sunlight behind your children, a technique known as backlighting, you will end up with the subject looking like a dark silhouette.

The Last Word

It really is all about fun. View the time you are taking to photograph your children as time to share in their adventures and imaginary play. A frustrated mom directing kids to a more picturesque location and insisting on a smile does not reflect kids reality. Pick up the camera only when everyone is relaxed and happy. Finally, dont expect every photo to be a masterpiece. The truth is that only a few images from each roll are frame-worthy, but the important thing is to keep snapping away to capture the moments that depict their ever-changing lives, in all its unique glory!

About the Author
Charlotte Riley has worked as an Internet editor, content producer, marketing writer and researcher. She has a BFA from Concordia University, majoring in Photography. In her spare time she can be found cooking, working on crossword puzzles or hanging out with her daughter, Kate. Contact http://www.acriley.com