Effects and watermark

Both are in the Render tab. They go on top of the finished picture, after the denoiser, and they are part of the PNG you save. They never touch the render itself, so changing them does not start it again.

Effects

Enable effects switches them all on and off at once, to compare. Every effect starts at 0 (off).

Effect	Settings	What it does
Bloom	Strength, Threshold, Radius	A soft glow around the brightest parts of the picture, like light spreading in a camera lens. Threshold sets how bright a part must be to glow, Radius how far the glow spreads
	Emissive glow	Makes glowing materials (screens, LEDs) glow in proportion to their Glow strength, whatever the threshold
Chromatic aberration	Amount	The thin color fringes a real lens leaves at the edges of the picture
Vignette	Amount, Softness	Darkens the corners to lead the eye to the product
Grain	Amount, Size	Film grain, for a photographic look

Tip: a little goes a long way. A touch of vignette and a little bloom on the highlights make a render look photographed; strong values make it look processed.

Watermark

A logo and a line of text in a corner of every PNG you save.

• Choose logo… loads your logo: a PNG with a transparent background, or an SVG. Remove takes it off.
• Show watermark switches it on and off without losing it.
• Corner: bottom right, bottom left, top right or top left.
• Size, Margin and Opacity of the logo. Size and margin are a share of the picture width, so the watermark looks the same at every output size.
• Text line, Text size and Text color add a line of text, for example a copyright or a website.

The watermark is kept with the project.