📚 Year 7 Cambridge Media Studies: Key Concepts & Formulas Quick Reference | Year 7 剑桥媒体研究：公式定理速查手册
This quick reference guide compiles the essential formulas, models and key concepts you will encounter in Year 7 Cambridge Media Studies. It is designed as a handy revision tool to help you understand how media texts are constructed, how meaning is created and how audiences are engaged. From semiotics to shot composition, these ‘formulas’ and frameworks give you a language to analyse and create media with confidence.
本速查手册汇集了 Year 7 剑桥媒体研究中必须掌握的核心公式、模型与关键概念。它是一份便捷的复习工具，帮助你理解媒体文本的构建方式、意义的生成机制以及受众的参与模式。从符号学到镜头构图，这些“公式”和理论框架将赋予你分析媒体、创作媒体作品的信心与语言。
1. Signifier & Signified (Semiotics) | 能指与所指（符号学）
The most fundamental ‘equation’ in media language states that a sign is made up of two parts: the signifier (the physical form we see or hear) and the signified (the mental concept it triggers). Together they form a sign. Understanding this relationship helps you decode layers of meaning in every media text.
媒体语言中最基本的“等式”是：一个符号由两部分构成——能指（我们看见或听见的物理形式）与所指（它在脑海中引发的概念）。两者共同组成一个符号。理解这一关系有助于你解读每一个媒体文本中的多层含义。
Sign = Signifier + Signified
For example, a red rose image (signifier) often signifies love or romance (signified). However, meanings are not fixed; they depend on cultural context. A lion might signify courage in one culture and danger in another. Media producers deliberately choose signifiers to control the message audiences receive.
例如，一朵红玫瑰的图片（能指）往往意指爱情或浪漫（所指）。然而意义并非固定不变，它依赖于文化语境。狮子在一种文化中可能意指勇气，在另一种文化中则可能代表危险。媒体制作人有意识地选择能指，以控制受众接收到的讯息。
2. Rule of Thirds (Composition) | 三分法（构图）
The Rule of Thirds is a compositional formula used in photography, film and graphic design. Imagine dividing your frame into nine equal rectangles using two equally spaced horizontal lines and two equally spaced vertical lines. The theory states that the most important visual elements should be placed along these lines or at their intersection points (often called ‘power points’), rather than dead centre.
三分法是在摄影、电影和平面设计中广泛使用的构图公式。想象用两条等距的横线和两条等距的竖线将画面分割成九个相等的矩形。该理论认为，最重要的视觉元素应当放置在这些线条上或线条的交叉点（常称为“力点”）上，而非画面的正中央。
Power Point coordinates: (1/3, 1/3), (2/3, 1/3), (1/3, 2/3), (2/3, 2/3)
Placing a subject’s eyes on the upper horizontal line creates a balanced, natural look. Landscapes often place the horizon on the upper or lower third to emphasise sky or land. This formula creates dynamic tension and guides the viewer’s eye, making the image more engaging than a static central composition.
将被摄主体的眼睛置于上方水平线上，可以营造平衡、自然的效果。风景摄影常将地平线置于上方或下方三分之一处，以强调天空或大地。这一公式能制造动态张力并引导观众视线，使图像比呆板的中央构图更具吸引力。
3. Colour Wheel Harmony Formula | 色轮和谐公式
Colour is a powerful media language tool. The colour wheel is a visual formula that helps media creators combine colours effectively. Three key harmony rules are: complementary (colours opposite each other on the wheel, e.g. red and green), analogous (colours next to each other, e.g. blue, blue-green and green) and triadic (three colours evenly spaced, e.g. red, yellow and blue).
色彩是强大的媒体语言工具。色轮是一种视觉公式，帮助媒体创作者有效组合色彩。三条核心和谐法则是：互补色（色轮上相对的颜色，如红与绿）、类似色（相邻的颜色，如蓝、蓝绿与绿）以及三色组（均匀分布的三种颜色，如红、黄、蓝）。
Complementary Contrast: Hue A + (Hue A + 180°) on RGB/CMYK wheel
Warm colours (red, orange, yellow) advance toward the viewer and convey energy, while cool colours (blue, green, purple) recede and create calm. Media texts often use colour grading to set mood. A horror poster might use a green-purple complementary scheme to feel sickly and unnatural, while a healthy food advert employs analogous greens.
暖色（红、橙、黄）向观众突进并传递能量，冷色（蓝、绿、紫）则后退并营造宁静。媒体文本常通过色调调整来设定情绪。一张恐怖片海报可能采用绿-紫互补配色，使人感到病态、不自然；而健康食品广告则使用绿色系类似色。
4. Exposure Triangle Formula | 曝光三角公式
In photography and cinematography, correct exposure is determined by the balance of three variables: Aperture (f-number), Shutter Speed and ISO. These form the Exposure Triangle. Changing one element requires adjusting at least one other to maintain the same exposure value (EV). The relationship is reciprocal.
在摄影和电影摄影中，正确曝光由三个变量的平衡决定：光圈（f 值）、快门速度与ISO 感光度。它们构成曝光三角。改变其中一个要素，就需要调整至少另一个要素以维持相同的曝光值（EV）。这是一种倒数关系。
Exposure Value (EV) = log₂(N² / t) where N = f-number, t = shutter time
A wide aperture (small f-number like f/1.8) lets in more light and creates shallow depth of field, blurring the background. A fast shutter (1/1000 s) freezes motion; a slow shutter (1/30 s) captures motion blur. High ISO increases sensor sensitivity but adds grain. Media creators choose combinations to craft visual mood and clarity.
大光圈（小 f 值，如 f/1.8）能进入更多光线并创造浅景深，虚化背景。高速快门（1/1000 秒）可凝固瞬间动作；慢速快门（1/30 秒）则捕捉动态模糊。高 ISO 提高感光度但会增加噪点。媒体创作者选择不同组合，精心塑造视觉氛围与清晰度。
5. Image Resolution & File Size Formula | 图像分辨率与文件大小公式
Digital media files have a physical size in storage. The uncompressed file size of a digital image can be calculated using a simple formula. This is vital when working with print and web media, as file size affects loading speeds and print quality.
数字媒体文件在存储中具有物理大小。未经压缩的数字图像文件大小可用一个简单公式计算。这一点在处理平面印刷和网络媒体时至关重要，因为文件大小影响加载速度和打印质量。
File Size (bits) = Width (px) × Height (px) × Bit Depth
To convert bits to bytes, divide by 8. For a 24-bit colour image (8 bits per RGB channel), a 1920 × 1080 frame requires: 1920 × 1080 × 24 = 49,766,400 bits ≈ 6.22 MB uncompressed. Resampling reduces dimensions, lowering file size. Always consider resolution for the intended medium: 300 PPI for print, 72–96 PPI for screen displays.
将位数转换为字节需除以 8。对于一张 24 位彩色图像（每个 RGB 通道 8 位），1920×1080 的画面需要 1920×1080×24=49,766,400 比特，约 6.22 MB 未压缩数据。重采样可缩小尺寸，从而降低文件大小。始终根据目标媒介考虑分辨率：打印用 300 PPI，屏幕显示用 72–96 PPI。
6. Narrative Structure: Freytag’s Pyramid | 叙事结构：弗雷塔格金字塔
Many media narratives follow a predictable ‘formula’ of five stages, often visualised as a pyramid. This structure helps scriptwriters and directors build tension and audience engagement. The stages are: Exposition, Rising Action, Climax, Falling Action and Denouement (resolution).
许多媒体叙事都遵循一个可预测的五阶段“公式”，常被描绘成一个金字塔形状。这一结构帮助编剧与导演营造张力并吸引观众。这五个阶段分别是：开端、发展/上升行动、高潮、回落/下降行动与结局（收尾）。
Narrative Tension = Rising Action → Climax → Resolution
Exposition introduces characters and setting. Rising action builds conflict through obstacles. Climax is the turning point of highest tension. Falling action shows consequences, and denouement ties up loose ends. Even a 30-second advert often follows a mini version: problem introduced, product solves it (climax), happy outcome.
开端介绍人物与背景；上升行动通过障碍推进冲突；高潮是张力最高的转折点；下降行动展示后果；结局化解所有矛盾。即便是一支 30 秒的广告也常遵循迷你版本：引出问题、产品解决问题（高潮）、圆满收尾。
7. AIDA Audience Engagement Model | AIDA 受众吸引模型
The AIDA model is a classic advertising and marketing formula that describes the steps a consumer takes before taking action. AIDA stands for Attention, Interest, Desire and Action. Media producers design texts to guide audiences through this sequence.
AIDA 模型是一个经典的广告与营销公式，描述了消费者在采取行动前经历的步骤。AIDA 代表注意、兴趣、欲望与行动。媒体制作人设计文本，引导受众依次经历这一过程。
Engagement Path: Attention → Interest → Desire → Action
Bold headlines or striking images grab Attention. Interest is held by revealing benefits or telling a story. Desire is created by showing how the product improves life. Finally, a direct call to Action (e.g. ‘Buy now’) prompts response. Analysing a poster through AIDA reveals exactly how it manipulates audience response.
醒目的标题或冲击性的图像抓住注意；通过展示产品利益或讲故事维持兴趣；展现产品如何改善生活激发欲望；最后，直接的行动呼吁（如“立即购买”）促使回应。用 AIDA 分析一张海报，能准确揭示其操控受众反应的手法。
8. Mise-en-Scène Elements | 场面调度元素
Mise-en-scène is a French term meaning ‘placed in the scene’. It refers to everything visible within the frame and can be analysed using a set of elements, often remembered by the acronym CLAMPS: Costume, Lighting, Actors (make-up, expression), Make-up, Props and Setting. Each element is a deliberate choice by the director to communicate meaning.
场面调度（Mise-en-scène）是法文术语，意为“置于场景之中”。它指画面中所有可见的内容，可以用一系列元素来分析，常以首字母缩写CLAMPS帮助记忆：服装、灯光、演员（含化妆与表情）、化妆、道具和场景。每个元素都是导演为传递意义而做出的刻意选择。
| Element | Meaning Conveyed |
|---|---|
| Costume | Status, era, personality |
| Lighting | Mood, time of day, genre (high key vs low key) |
| Actors | Emotion, relationships, hierarchy |
| Make-up | Health, character traits, transformation |
| Props | Symbolism, character occupation, plot clues |
| Setting | Location, social context, atmosphere |
Low-key lighting with deep shadows can suggest mystery or danger, while high-key lighting with bright, even illumination feels cheerful. A superhero’s costume instantly signals identity and power. Analysing all CLAMPS together reveals the constructed reality of a media text.
带有深重阴影的低调光暗示神秘或危险，而明亮均匀的高调光则让人感觉欢快。超级英雄的服装立即传达身份与力量。将 CLAMPS 所有元素一同分析，便能揭示出媒体文本被构建的现实。
9. Media Language: Denotation & Connotation | 媒体语言：明示义与隐含义
Building on semiotics, every media sign carries two levels of meaning. Denotation is the literal, descriptive meaning – what you actually see or hear. Connotation is the associated, cultural or emotional meaning it evokes. The formula helps unpack how media texts create layers of ideology.
在符号学基础上，每个媒体符号都承载着两层含义。明示义是字面的、描述性的含义——你真正看到或听到的东西。隐含义则是它引发的联想、文化或情感意义。这一公式有助于拆解媒体文本如何构建深层意识形态。
Meaning = Denotation (literal) + Connotation (associated)
A poppy flower: denotation – a red flower with black centre. Connotations include remembrance, sacrifice, military conflict (especially in UK contexts). A fast-food advert might denote a burger, but connote happiness, family togetherness and quick satisfaction. Always analyse both levels when studying media texts.
一朵虞美人花：明示义——一朵带有黑色花心的红色花朵。隐含义则包括悼念、牺牲、军事冲突（特别是在英国语境中）。一则快餐广告可能明示一个汉堡，但隐含幸福、家庭团聚与快速满足感。分析媒体文本时，务必对两个层面都加以审视。
10. Camera Shot Types and Angles | 摄影景别与角度
Camera distance and angle form a visual grammar with specific meanings. The main shot sizes follow a scale: Extreme Long Shot (ELS), Long Shot (LS), Medium Shot (MS), Close-Up (CU) and Extreme Close-Up (ECU). Angles include high angle, low angle and eye-level. Each choice positions the audience in relation to the subject.
摄影距离与角度构成一套携带特定含义的视觉语法。主要景别按尺度排列：大远景、远景、中景、特写和大特写。角度则包括俯角、仰角和平视。每一次选择都将观众置于与主体的特定关系之中。
Power Dynamics: Low Angle = Subject powerful; High Angle = Subject vulnerable
A low-angle shot looks up at a character, making them appear dominant or heroic. A high-angle shot looks down, suggesting weakness. Eye-level conveys equality. Combining a close-up with a low angle intensifies power. A close-up of a face reveals emotion, while an extreme long shot establishes setting and isolation.
仰角镜头向上仰视人物，使其显得强势或英勇。俯角镜头向下俯视，暗示脆弱。平视传达平等。将特写与仰角结合，会强化力量感。脸部特写揭示情感，而大远景则确立场景与孤立感。
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