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Render Target 2d Export PNG Appeared Darker

When I use CaptureScene2D to capture scene using "Final Color (LDR) in RGB", and store it in a RenderTarget2D with a RGBA8 format, the captured image is much darker than in viewport, And after I export it to a PNG file,it appears even darker,and with unwanted alpha channel.

alt text

What it should look like: alt text

Captured to aRenderTarget2d: alt text

Export to PNG,and import to UE to see how it look like: alt text alt text

BTW I use TAA for the capture and captured multiple times to get better TAA result. TAA works fine,but only darker. I simply want to capture the image which is exactly look like which is in viewport, What did I miss?

Product Version: UE 4.18
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asked Aug 09 '18 at 04:47 PM in Rendering

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avatar image papalqi Aug 18 '18 at 08:47 AM

Have you solved this problem?

avatar image Nevets Sep 01 '18 at 02:42 PM

Yes...well kinda... To get the same brightness in capture, I tweeked the postprocess\Tonemapper\Slope=1,Toe=0,and it gives me a relatively accaptable result. And to get the right PNG output,I set the render target gamma to 1.001. NOT 1, 1 will not work.., These settings solved my problem, but the result is still a little pale than the original image... I can't help myself to say this: Why O why is it so hard to get a simple render output ???

avatar image Nevets Nov 27 '18 at 04:42 PM

Hey I just found the solution! I found out that viewports are using gamma correction(=2.2) but the scene captures are not,so first set the gamma in render target to 2.2,then is the post proccess material, add a power node to the final result,(exp=2.2),then export to png,you will finally get the exact result like it's in the viewport.

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