Loader Node show a specific image from a list

Hello
How to call a specific image from e list of image loaded into the NODE Loader

example i have 3 image.
imag_1.png
imag_2.png
imag_3.png

at frame 20 i will like to show imag_3.png,
at frame 22 i will like to show imag_1.png

Thanks
Marco

TimeStretcher is what you need. In your example, at frame 20 you'd set a keyframe in the SourceTime field with a value of 3. At frame 22, set it to 1 (assuming your timeline starts at frame 1 and the Loader's Global In or Hold First Frame haven't been changed). At frame 21, the TimeStretcher will interpolate and display imag_2.png. If you want for it to instead continue showing imag_1.png, you could either set another keyframe on that frame or change keyframe interpolation mode to Step In in the Spline view.

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Bryan Thanks, now all is working fine.

I notice that sometimes (when he tried to make changes) i need to delete and then put back the loader because changes i had made were not visible (not showing-up) .
I was wondering if in Fusion there is a button / command to ( REFRESH ) the composition
Im using Fusion standalone.

ciao
Marco

In the lower-right corner of the interface there's a readout showing your cache—it's a percentage and a memory value. Right-click that, and you'll get options to Purge Cache and Re-Render Current Frame.

If all you need is to force a Loader to refresh, though, usually toggling its Passthrough state will force it to happen. If that doesn't work, then clicking the Browse button and selecting the self-same file as it's currently pointing to will usually do it. Fusion doesn't seem to realize that it's loading the same frame over again.

Bryan , that was a very very helpful information.
Thanks again