Friday, 26 February 2016

摄影构图

摄影构图

构图一词是英语COMPOSITION的译音,为造型艺术的术语。
它的含义是:把各部分组成、结合、配置并加以整理出一个艺术性较高的画面

每一个题材,都包含着视觉美点。
当我们观察生活中的具体物象人、树、房或花的时候,应该撇开它们的一般特征,而把它们看作是形态、线条、质地、明暗、颜色、用光和立体物的结合体。

运用各种造型手段,在画面上生动、鲜明地表现出被摄物的形状、色彩、质感、立体感、动感和空间关系,使之符合人们的视觉规律才能取得满意的视觉效果。

构图与布局的五个关键的问题,可概括为:
主题在画面的位置和地位;
陪体在画面的地位和作用;
环境对烘托主体的作用;
画面空白的留取;
画面要达到整体的均衡;

Composition :Elements and principles

Composition :Elements and principles





Principle of arts

Composition
Principle of arts

They include:
Balance
Proportion
Emphasis
Variety
Movement
Rhythm
Harmony

Balance: The sense of stability achieved through implied weight of an object.
There are three different types of balance: symmetrical, asymmetrical, and radial.

Symmetrical balance: When one image is mirrored on the other side to repeat itself
Asymmetrical balance: When different types of elements create a visual balance.
Radial balance: The distribution of elements around a central point in all directions.

Proportion: The ratio of one art element to another. It is important to keep in mind the relationship between different elements of the composition so that the scale of your artwork always makes visual sense.
Emphasis: When one element of an artwork stands out more than another. This creates a sense of importance and is intentionally used to communicate a message or feeling. Emphasis creates variety in your artwork.

Variety: The counterweight to harmony and creates visual interest by slightly changing or using different elements together in a composition. It can be created with contrast, change, elaboration, or diversifying elements. With variety, it is important to consider how the elements are working together so that you still have harmony and unity within a composition.

Movement: The visual flow of your artwork. It's the path that you intend your viewer's eye to follow. You can create this by purposefully placing art elements in a way that creates this path.

Rhythm: is a type of movement in drawing and painting. It is seen in repeating of shapes and colors. Alternating light and dark also give a sense of rhythm.


Harmony: means all parts of the visual image relate to and complement each other.




Elements of arts

Composition

Elements of arts




































Line a path created by a moving point, mark or object. It is a dot that takes a walk. Line can be straight, swirly, wavy, jagged, dotted, dashed, broken, thick, thin,  zig zag, diagonal, vertical, horizontal, curved, bold, parallel or perpendicular.

Shape A two-dimensional (2D), flat enclosed area. When a  line crosses over itself it creates a shape. Examples of shapes could be geometric, organic/natural, irregular, circle, square, rectangle, diamond, oval, crescent, heart, triangle, octagon.

Color The element of art derived from reflected or absorbed light. Color adds  interest and mood to a work of art. It is also referred to as "Hue". The primary colors are red, yellow and blue. The secondary colors are created by mixing the primary colors. They are purple (violet), orange and green.

Texture How something feels or looks like it would feel if you could touch it. There are two kinds of texture: Real (how something actually feels, such as a sculpture) and Implied (when an artist paints or draws a texture but it is artificial).

Form Objects having three dimensions (3D), or height, width, and depth.  You can walk around a form. Examples of form can include cubes, cylinders, and spheres.

Value The lightness or darkness of an object. The degree of lightness or darkness. The effect of light and shade in a picture. Value vocabulary includes tint (adding white to make something lighter), shade (adding  black to make something darker) and hue (the true color). Shadow, highlight, and light source are also some vocabulary words to consider with this element of art.

Space The element of art that refers to the emptiness or area around or  within objects. Positive space refers to the part of the artwork that takes up space. Negative space is the area around that object. This element of art also refers to the "parts" of the picture... Foreground, Middle ground and Background!

Zone system

Zone system in photography


In the Zone System, measurements are made of individual scene elements, and exposure is adjusted based on the photographer’s knowledge of what is being metered.


根据亚当斯的理论,黑白照片的色调或灰调可以分为十个“区域”,由零区域(相纸能够表现出的最黑的部分)至第十区域(相纸的底色——白色)。第五区域是中等的灰度,它可以根据测光表的读数曝光而得出来;第三区域是有细节的明影部分,而第八区域则是有细节的强光部分。


凭着区域系统,摄影者便可以预见到照片的最后影像,并使底片能够根据摄影者心目中的构思去曝光。一个简单的例子,就是量度阴影部分的光量,为使这部分能够有更多细节,并将光圈增大两级;然后量度重要强光部分的光量,按照区域系统理论,强光部分比阴影部分亮了五级,如果明影部分是第三区域的话,强光部分便是第八区域。倘若这是摄影者的构思,便可以马上进行拍摄。要是想使强光部分有更多层次,摄影者可以缩短底片的显影时间来减低反差,使第八区域变为第七区域。相反地,如果想使重要阴影部分有更多层次,而这部分又比较明亮部分暗了三级,显影时便可增加时间以增大照片的对比度,从而使强光部分变得更亮。


Incident metering vs. reflective metering

Incident metering vs. reflective metering



















All in-camera light meters have a fundamental flaw: they can only measure reflected light.
This means the best they can do is guess how much light is actually hitting the subject.

If all objects reflected the same percentage of incident light, this would work just fine, however real-world subjects vary greatly in their reflective.

For this reason, in-camera metering is standardized based on the luminescence of light which would be reflected from an object appearing as middle gray.

If the camera is aimed directly at any object lighter or darker than middle gray, the camera's light meter will incorrectly calculate under or over-exposure, respectively.

A hand-held light meter would calculate the same exposure for any object under the same incident lighting.

In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale.
In photography, it is typically defined as 18% reflective in visible light.


Metering mode in camera

Metering mode in camera

Metering is how your camera determines what the correct shutter speed and aperture should be, depending on the amount of light that goes into the camera and the sensitivity of the sensor.

Today, every DSLR has an integrated light meter that automatically measures the reflected light and determines the optimal exposure.

The most common metering modes in digital cameras today are:

Matrix Metering (Nikon), also known as Evaluative Metering (Canon)
Center-weighted Metering

Spot Metering