ETC Cobalt Family v7.1.0 - Manual (Page 764)

Cobalt 7.1 - 20140612
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2. Press INSERT to create a new image. You will get a popup
3. Enter the size of the image. The size is relevant to the size of the effect layout it will be applied to.
We recommend 128x128 which you can scale to a lot of layouts.
4. Press MODIFY in the Image column of the new image. This opens the layout editor tool.