GIMP Version:
Operating System: Mac OS
GIMP Experience: Experienced User

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Hi guys! In have 120 anime frames with Plain colors and no fades
I wish to build A common palette. I have to manually open each image and pick each colour?
Second step will be indexing and apply my palette with specific colors. Thank you

Is this any use?

https://www.gimplearn.net/viewtopic.php/Palette-from-Image-aka-Palette-Importer-Script-Plug-in?t=1637&p=19061

By frames I assume you mean images (and not layers).

Use “File > Open As Layers” and open all 120 images. You will have 120 layers.

Use “Image > Mode > Indexed” and set the required number of colours (max 256).

Do “Windows > Dockable Dialogues > Colormap”. Select a colour in the colormap and edit it. Or you can use the Color Pick Tool to select a colour in image. That colour will be selected in the colormap.