@SchoonhovenOntwerpStudio, thanks for writing in! I’ll be happy to help provide some more context for working with Effects to help you achieve your desired result.
So you mentioned that you’re wanting your image to come into view when the Section is “fully visible” and disappear when the Section is almost out of the viewport. The thing to remember with Effects is that they are directly related to the positioning of the inspected Element only. This means that your Effect timing of one Element cannot be based off of another Element’s positioning, you have to time it and specify it based on the Element itself. This makes the most sense anyway, as for almost every situation of wanting to trigger an Effect, you’ll want to trigger it when that Element itself is in view and then operate on it.
As for timing your Effects, the Offset positions are triggered like so:
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Top: When the TOP of the Element hits TOP of viewport
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Bottom: When the TOP of the Element hits BOTTOM of viewport
So our Effects timing is all based off of the TOP of our Element hitting either the TOP or BOTTOM of our viewport. And really, the Top Offset is only used for the In - Out behavior.
So think of it more from the standpoint of: “How far should the TOP of my Element come into view when I want to trigger its IN positioning and how far AWAY FROM THE TOP of my viewport should the TOP of my Element be when I want it to go back to it’s OUT positioning (if you’re using ‘In - Out’ behavior).” There’s no specific value we can provide to achieve a certain result, as it’s really a matter of trial and error with your content, how long your timing transition, and how you want the Effect to be applied.
Hopefully this information will help you time things out a little better and provide some more perspective for you to achieve what you’re after. Cheers!