The Render Animation output goes almost pink

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This is not related to the File > Render Animation command, you'll get the same result when selecting Save Image As.

The pink color is the default error color. Most probably your filter is trying to divide something by zero.

Does it happen with a different filter?

I tried animation filters created by someone else. No errors appeared. There seems to be something unusual about my filters, but I haven't figured it out yet.

Errors occur in three of my four filters in the filter library.

When creating a filter one has to think of the usage for that filter. This will sometimes give a direction on when to use the components marked with the word Free. I took a look at some of your filters and seen that you were using the free components in the groups. Changing the xy Anchor to max seems to fix the issue. After I did this the filter above seems to work fine. There are also seamless and non-seamless components that once in a while do not play nice with each other so it is a balance of their usage when using those in the same filter. Sacrificing one thing for another thing is part of that balance.

The issue is with the lookup being a seamless component and the profile gradients being seamless. If you use the free gradients with this but slightly modded there is no issue, if this is what you are going for. Change the xy anchor on the gradients.

There are different ways to accomplish what you are going for and sometimes it takes a little tweaking. Rendered at 1500 by 1500 and then shrunk down after the fact.

The lookup was erased, but the error still occurs. Why is that?

File > Render Animation, output at large sizes will result in an error, but there is no problem when outputting in small sizes.

Could I have done what you have shown me?

This also results in an error.

This cannot be seen in the preview.
Only images output from File > Render Animation show an error.

I also use Win10.

Ok I thought about this problem and thought back to a bug report I made over 15 years ago. Took me a minute to get to the right number to reproduce the error that you have. Maybe when reporting the bug the FF team will have a direction to go.
Seamless tiling was turned on and a blank image of the size posted was created. Then rendered as you posted.

Others sizes also give me the same result.

You are very welcome. Sometimes the hard part is figuring out how to reproduce the bugs.
I tried just a simple profile gradient and got the same result. Saving the image at 1500x1500 all was normal
then I rendered a frame of the animation and got the bug......

Kinda of a odd issue although it could be a quick fix sorta maybe. I uninstalled FF 14 and reinstalled. I then used the gradient filter tree above and rendered a frame without the seamless tile enabled. I used 1651x1500 px. I then rendered another frame with the seamless tile checked at the same size of 1651x1500 px.
Now check the same method at the size of 1500x1500 to see if you now get a good image... If you get a good image then see if you are good to go..

It is a random one when it wants to show up or disappear. I uninstalled and manually deleted the folders that the uninstaller does not. Then I downloaded the installer from the website and installed from that. Regardless I will now move on to something else and wait to see what happens with this one..

Quote
Matsuzaki wrote: Thank you for everything. I'll try this ritual again later. I'm writing this as a note below, so you don't have to worry about it anymore.

You are welcome and I had to try it again because it was annoying me that I did not have an answer.
I did figure it out and the reason. When you are in the main window for FF at the bottom there is a button to display the image
in draft mode. When you are in draft mode saving an image saves as normal but for some reason it does not when rendering
animations or frames. Simply clicking that off to get out of draft mode works.

One more image with the draft mode on and then draft mode off. The image was rendered at 1500x1500

Just a quick video of the above method to produce the oddness. Draft on off render error

Glad you got it working.
Working in actual size is something I do unless there is a slowdown in rendering.
It is unusual for the draft mode and rendering of animated frames to have the oddness
on only certain filters while working fine with others in the same mode.