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   help on Tips & Comments |
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| (according to jim, that is...) | glossary notes: |
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help on Tips & Comments |
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| (according to jim, that is...) | glossary notes: |
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
| Select the first letter of the word you want to find from the list above. If the term you are looking for starts with a digit or symbol, choose '#'. |
| Click on image to view it larger |
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| Example of Back lighting |
- Balance
- Centers-of-Interest
- Character of edges and lines
- Color
- Contrast
- Eye Movement
- Figure/Ground relations
- Framing
- Light/Shadow
- Pattern
- Perspective
- Scale
- Symmetry
- Texture
| Click on image to view it larger |
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| Example of using Depth of Field to blur a background |
A handy rule-of-thumb is that objects 1/3 of the distance in
front of and 2/3 of the distance behind where you focus will also be in focus. In other
words, the distance where you focus is about 1/3 of the distance into the range which will
be in focus.
Of course, a smaller aperture or shorter focal length lens will increase the depth of
field. It is interesting to make a pin hole lens, with no glass elements. It has about a
180 degree field and everything is in focus from a fraction of an inch to infinity (but
not a very sharp focus).
| Click on images to view larger | |
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| Example of gesture photo | Example of gesture photo |
| Fig. 1 | Fig. 2 |
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- Aerial perspective depends on the fact that blue light waves are scattered by tiny particles in the atmosphere (which are nearly the size of the blue waves) more easily than are the much longer red light waves. This is why the daytime sky is blue and sunsets are reddish. The atmosphere is not perfectly clear. We usually see some dust and haze. Therefore, when distances are considerable, the farther away an object is from the viewer, the bluer it appears from blue light scattering and the less contrast it has because of dust and haze.
- Spatial perspective is a scale effect. For a well known object, say a person, the smaller the person appears in a scene, the farther away they are perceived to be. Also, if one object is superimposed over another it is perceived as being in front of (i.e. closer) than the object it obscures.
- Geometric perspective, a related principle, is based on the concept of one or more "vanishing point(s)" at the horizon. Objects are perceived to have height and width when nearby or at middle distance. But they seem to get smaller and smaller with increasing distance, finally vanishing as tiny points. The classic example of this effect is the view of the rails of a railroad track, seeming to converge and vanishing at a point on the horizon.
Click image to view larger
- 1) Aerial perspective
- Notice the blue cast to the upper part of the image, with the water and farthest trees. Notice also the red cast of the path and area to the right of the path, near the bottom of the image. The reddish and bluish casts of both the upper and lower areas were increased, using Adobe Photoshop, to increase the aerial perspective.
- 2) Spatial perspective
- The birds, trees and fence posts show this effect.
- 3) Geometric perspective
- The path seems to narrow and the fence posts to move closer together, from the bottom of the image toward the upper third.
Example using all three
types of perspective
-- Thanks,
-- jim coe
