Merge 节点Merge Node
学习目标LEARNING OBJECTIVES
学完你能说清 Merge 节点（Merge Node）三个输入口的分工，正确连接前景与背景，完成一次两图叠加。
概念说明CONCEPTS
Merge 节点是把一幅图像叠到另一幅图像上的合成节点——Fusion 里"两层变一层"几乎都靠它，是使用频率最高的节点之一。
- 背景输入（Background，橙色）：垫底的图像接这里；它还决定 Merge 输出的分辨率。
- 前景输入（Foreground，绿色）：想"在上面"的图像接这里，压在背景之上。
- 效果遮罩（Effect Mask，蓝色）：可选输入，接蒙版（Mask）来限制合成范围，平时空着即可。
- 认颜色不认位置：Fusion 看的是接口颜色，不是左右位置；节点摆歪了不影响结果。
操作步骤STEPS
- 取消所有选择，点工具栏上的
Merge图标，把 Merge 节点加进节点编辑器 - 把垫底图像的输出（灰色小方块）拖到 Merge 的橙色背景输入上
- 把上层图像的输出拖到 Merge 的绿色前景输入上
- 把 Merge 的输出连到
MediaOut节点 - 选中
MediaOut按2载入查看器，确认叠加结果
练习PRACTICE
- 用两个 Background 节点（一白一黑）加一个 Merge，叠出"白底黑块"。
- 故意把前景、背景接反看效果，再用
Cmd-T/Ctrl-T对调回来。
常见问题FAQ
合成后画面分辨率怎么变了？
Merge 的输出分辨率由背景输入（橙色）决定。看看垫底那一路接的是谁，想要谁的尺寸就把它接背景。
蓝色的输入口必须接吗？
不必。蓝色是效果遮罩（Effect Mask），只在需要用蒙版限制合成范围时才接，平时空着不影响。
加新工具时怎么自己多出一个 Merge？
选中已有节点再添加需要叠加的工具（如 Text+）时，Fusion 会自动补一个 Merge 帮你接好。这是贴心功能，不是故障。
Learning Objectives学习目标
After this card you can explain the three inputs of a Merge node and wire foreground over background correctly for a two-image composite.
Concepts概念说明
A Merge node composites one image over another — in Fusion, almost every "two layers become one" moment goes through it, making it one of the most-used nodes.
- Background input (orange): the bottom image connects here; it also sets the Merge's output resolution.
- Foreground input (green): the image you want "on top" connects here, layered over the background.
- Effect Mask input (blue): optional input for a mask that limits where the merge applies — fine to leave empty.
- Color matters, not position: Fusion reads connector colors, not left/right placement, so a crooked layout still works.
Steps操作步骤
- Deselect everything and click the
Mergeicon on the toolbar to add a Merge node - Drag the output (small gray square) of your bottom image onto the orange Background input
- Drag the output of your top image onto the green Foreground input
- Connect the Merge's output to the
MediaOutnode - Select
MediaOutand press2to load it in a viewer and check the composite
Practice练习
- Build a "black box on white background" composite from two Background nodes and one Merge.
- Deliberately connect foreground and background backwards to see the result, then fix it with
Cmd-T/Ctrl-T.
FAQ常见问题
Why did the resolution change after my merge?
A Merge takes its output resolution from the Background input (orange). Check which image sits at the bottom — connect the one whose size you want.
Do I have to connect the blue input?
No. Blue is the Effect Mask input — only connect a mask when you want to limit where the merge applies; otherwise leave it empty.
Why did an extra Merge appear when I added a tool?
When a node is selected and you add a tool that needs compositing (like Text+), Fusion auto-creates a Merge and wires it up. That's a feature, not a glitch.
本卡术语Terms in this card
分辨率Resolution 静帧Still 合成Compositing Fusion 合成Fusion 合并Merge 节点Node