Digital Photography Tutorials – Bayer Demosaicing

The next step in the series of digital photography tutorials is an extension of understanding camera sensors, and explains about Bayer demosaicing. Bayer demosaicing is basically a process of converting the Bayer array of primary colors into the final product, i.e., an image that has full color detail on every pixel. While this might seem like a fairly impossible task, the way to understanding how this works is by considering each array (2X2) of red, green and blue as a full color cavity.

A majority of the modern age cameras take even more steps to extract greater image information from this array, i.e., if a camera treats all colors in the 2X2 array as landing at the same spot, only half of the resolution would be properly extracted in the horizontal as well as vertical directions. However, if the color is determined using multiple overlapping arrays, a higher resolution would be achieved as compared to the former case, where only a single set of array was being taken.

However, a point to note here is that image information at the end of the arrays is not calculated, since there is always an assumption that the image continues in each direction. But in case the array(s) in consideration are actually the edges of the cavity array, the calculations would certainly be less accurate, as there are no pixels on all sides. However, one can easily crop out information that is gathered from the edges of pixels.

A special case can be of images that have small-scale detail near the resolution limit of the camera’s digital sensor, as they have the tendency of rendering the demosaicing algorithm ineffective, and result in an unrealistic image. The most common artifact in this regard is moirĂ©, which could appear as repeating patterns, pixel arranges or color artifacts.

Digital Photography Tutorial – Looking At How To Photograph Wildlife

If you look on the shelves of any book or magazine stores you will find many that are dedicated to wildlife photography. In addition to the countless books and magazines there are thousands of web sites and blogs related to photographing wildlife and mastering the techniques of just how to photograph wildlife.

This is one of the areas of digital photography where the better the equipment you have, the better the results. That said, it takes more than a long lens and a silent camera. It also requires a lot of practice and a huge amount of patience.

It doesn’t matter whether you are taking pictures of birds of prey in your local woods or lions on the Serengeti plains, you will struggle to take good photographs of wildlife if you don’t own an interchangeable-lens SLR. Capturing birds in mid-flight is one of the most challenging things for a photographer to attempt. An SLR makes this so much easier.

It is a different matter of course, if you want to photograph farm animals or are on an organized safari where you can get up and close with the animals and they are used to a human presence. In cases like this, you are much more likely to have better success with a compact camera, especially if it has a decent zoom range.

Zoos and wildlife parks are an ideal place to snap exotic animals.

Top Digital Photography Tutorial Tip: Try to zoom in on the animal itself by using the long end of your lens. If you use a long lens and wide aperture (small f-number) you will usually find that the limited depth of field makes the wire fences magically disappear.

Obviously if you are going to shoot between the bars make sure you are not taking any risks and you are keeping tight hold of your camera.

I have witnessed on several occasions mischievous monkeys grab cameras from over eager snappers in Gibraltar where they virtually have the freedom of the rock.

Depth of Field – Digital Photography Tutorial

Actually, I touched base on this subject in a previous digital photography tutorial. In photography, you consider composition, focal point, foreground, background, slants, frames, thirds, lines, perspective, scale, and so forth. The focal point is the objective of the game in a way, yet composition is the target. I used the terms plot in previous publications because those less familiar with digital imaging might find it easier to relate.

Anyway, all there terms sounds nuts if you don’t understand photography; however, the focal point is a natural attraction to the eye, while composition is the plot. Let’s break this down. Okay, you are writing a book on the subject photography. You know the main composition is surrounding photography; however, you must capture cameras, film, printers, etc in the body to make someone understand what you are seeing and how it works. Likewise, if you are snapping pictures you will need a main attraction, which will lead the eyes to a foreground, background, focal point, and so forth. You need something to hit home in this picture in other words. Yet, while the eye is hitting home, it also wants a feel of the surroundings so that it can see where the picture is leading. What does it mean? What did you see in this picture that I am missing?

For example, I am taking a shot of a barn off in the distance and in its surrounding, is a field of yellow flowers of some sort and green grass beneath it. The foreground (flowers) leads me up to the caption that I had targeted, which makes a person wonder why someone would want a picture of the likes. The imagination starts to explore. In this picture, I used the rule of the thirds while adding a foreground to the scene.

In the depth of field, I snap a shot of a clear blue sky with sorted clouds dancing in the air. A distant hill captures the sky bringing it down to the earth’s surface, which we know is not real. The foreground takes the front leading you to a boulder half buried in the ground with more boulders spread out in a filed of yellow with shades of green grass. In this scene, I would use a lens that focuses on the length the lens will extend, the distance focus, and the aperture option. Since this is a landscape photo, I would use an aperture size of small to reach an effect.

If you are taking photos of landscape, the wide-angle lenses are the best choice. The lens will provide a depth deeper than other model lens. An f/22 depth is ideal if you are snapping pictures at a distance.

It makes a big difference how you use a camera as to how the film or photo will turn out. If you are starting out in photography, your best bet is becoming acquainted with the terms photographers use, including their definitions. While there are software programs for editing available, if you get the feel of the camera and use it wisely, you will spend less time in front of a computer and more time in the field snapping those shots.

After writing around 50 digital photography tutorials I’ve learned a lot about photography. However, the one thing I already knew is that your eyes and instincts will guide you better than anyone or any device. If you are working towards becoming a professional, never let anyone defy you of your natural instincts and eye, which will only guide you towards the wrong direction. Keep it real and go with your gut feeling!