Render the camera view to RenderTarget and the texture is darker

Development Rendering
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1

Hi everyone,i try to render the camera view to RenderTarget.
But the texture is obviously darker than the viewport’s.
So,am i missing any rendering step?

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image1920×552 97.4 KB

2

ok,it’s because of the diffrence of postprocesssetting value.
and it look like Bloom params or EyeAdaptationViewState.