在Photoshop中，opacity和fill的主要區(qū)別在於影響範(fàn)圍不同。 1. Opacity控制整個(gè)圖層的透明度，包括像素、效果（如陰影、描邊）和混合模式；2. Fill僅影響圖層上的實(shí)際像素，不影響通過圖層樣式添加的效果。例如，降低opacity會使整個(gè)圖層（包括陰影和描邊）變透明，而降低fill只讓像素內(nèi)容變淡，描邊或陰影保持不變。兩者可獨(dú)立或結(jié)合使用，以實(shí)現(xiàn)不同的視覺效果。

In Photoshop, opacity and fill both control how visible a layer is, but they affect different parts of the layer. Opacity changes everything — the pixels, effects, and blending. Fill only affects the actual pixels on the layer, leaving layer styles like drop shadows or strokes untouched.

Opacity: Controls Everything on the Layer

When you lower the opacity of a layer, it makes the entire layer more transparent — that includes the pixels you've painted or placed, as well as any layer effects (like drop shadows, strokes, or gradients).

• If you have a red circle with a drop shadow and set opacity to 50%, both the circle and the shadow become semi-transparent.
• This is useful when you want to subtly blend a layer into the background or reduce the overall impact of a design element.

Think of opacity like adjusting the transparency of a printed photo — everything on that photo, including any ink or texture added on top, becomes lighter.

Fill: Only Affects the Layer's Pixels

The fill setting works similarly, but it only affects the base content of the layer — the pixels you've drawn or filled in. It doesn't touch layer styles , so if your layer has a stroke or shadow, those stay fully opaque even if you lower the fill.

• Example: You have a blue square with a black stroke. Lowering the fill to 30% makes the blue almost disappear, but the black stroke remains solid.
• This is great for creating subtle textures or fading out shapes while keeping crisp outlines or effects intact.

Use fill when you want to fade the artwork itself without affecting the stylistic elements added via layer styles.

How to Use Them Together or Separately

You can adjust opacity and fill independently. Here's how that plays out:

• Set fill to 100% and opacity to 50% : The whole layer, including effects, is semi-transparent.
• Set fill to 50% and opacity to 100% : The image looks faded, but effects remain strong.
• Set both to 50%: A combined effect where the base image is partially faded, and effects are also dimmed.

This gives you flexibility in how you blend visuals without needing extra layers or masks.

So depending on whether you want to affect just the image or the whole layer including effects, use fill or opacity accordingly. They're simple sliders, but knowing the difference opens up more creative control.

基本上就這些。

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