Hi,

Describe the bug
When using the script with an asesprite file that is using Colour Mode: Indexed, it changes the colours of the layer it is applied to.

To Reproduce
Colour Mode Indexed file, apply script to a coloured layer - the resulting frames (and original) are recoloured.

Expected behavior
Colour stays the same, background is given scrolling animation

Screenshots
Before:

After:

System Information (please complete the following information):
Win 10 Pro

Additional context
NA

Thanks!