尺寸 · 空间分辨率Size · Spatial resolution

难度LEVELL1 · 入门L1 · Beginner 领域TOPIC媒体管理

学习目标LEARNING OBJECTIVES

学完你能说清「分辨率」到底在说什么——画面有多少像素——以及为什么把导出尺寸调大，画面并不会变清晰。

概念说明CONCEPTS

画面有多少像素：连续的现实被切成的网格，一格就是一个像素；「尺寸」说的就是这张网格有多大。

轴上的数值：

  • 480p（约 640×480）——老视频、小窗口、素材预览
  • 720p（1280×720）——流媒体低档、代理（proxy）
  • 1080p（1920×1080）——今天最通用的交付尺寸
  • 2160p / 4K（3840×2160）——平台高规格、影院、重构图余量
同一机位在 480p / 1080p / 4K 下的差别

同一机位、同一素材：480p 纹理被抹平 → 1080p 变软 → 4K 细节都在。（素材：ARRI Amira，ProRes 4444 12bit 3840×2160）

五个方向合起来看：▶ 五维图交互演示（按 1/2/3/4 切换四种素材）。

操作步骤STEPS

  1. 把画面拉到 200%，看细节站不站得住
  2. 缩放时留意插值伪影——变软、锯齿
  3. 核对序列与导出分辨率是否一致（别让导出尺寸替你做决定）

练习PRACTICE

动手任务

把同一段素材分别放进 1080p 和 4K 时间线各导出一次，对比文件大小与清晰度，回答：它变 4K 了吗？

自检清单

做完任务后逐条自查，全部能打勾才算过。 做完任务后逐条自查，全部能打勾才算过。

常见问题FAQ

放进 4K 时间线、导出 4K，素材就变成 4K 了吗？

像素可以被放大（从最近的像素借），细节不能被发明——两个场都有同学这样问。

怎么判断素材够不够清晰？

拉到 200% 看细节；缩放时盯伪影。

Learning Objectives学习目标

After this card you can say what "resolution" means — how many pixels the picture has — and why exporting at a bigger size does not make the picture sharper.

Concepts概念说明

How many pixels the frame has: continuous reality cut into a grid, one cell per pixel. "Size" is how big that grid is.

Values on this axis:

  • 480p (~640×480) — old video, small windows, previews
  • 720p (1280×720) — low streaming tier, proxies
  • 1080p (1920×1080) — today's default delivery size
  • 2160p / 4K (3840×2160) — premium platforms, cinema, reframing headroom
The same frame at 480p / 1080p / 4K

Same camera, same take: 480p wipes texture → 1080p softens → 4K keeps it all. (Source: ARRI Amira, ProRes 4444 12bit 3840×2160)

All five axes together: ▶ the five-axis interactive chart (press 1/2/3/4).

Steps操作步骤

  1. Zoom the picture to 200% and check whether detail holds
  2. When scaling, watch for interpolation artifacts — softening and aliasing
  3. Make sure sequence and export resolution match (don't let the export size decide for you)

Practice练习

Hands-on task

Export the same clip from a 1080p and a 4K timeline, compare file size and sharpness, and answer: did it become 4K?

Self-check

Work through the task, then tick every line; all checked means you own this card. Work through the task, then tick every line; all checked means you own this card.

FAQ常见问题

Put it on a 4K timeline, export 4K — did the footage become 4K?

Pixels can be borrowed from their neighbours; detail cannot be invented — asked by classmates in both sessions.

How do I judge whether footage is sharp enough?

Zoom to 200% and look at the detail; watch artifacts while scaling.

本卡术语Terms in this card

时间线Timeline 导出Export ProResProRes 分辨率Resolution 窗口Power Window 帧Frame 像素Pixel PNGPNG 代理Proxy