[#s39cd0c2]

Original image miso ramen (CC 0 from wikiepdia)

16 color reduction color
https://i.imgur.com/wNsrUez.png

Reduced color considering TSA with FEBuilderGBA
https://i.imgur.com/nqgzmKO.png

With color reduction considering TSA, you can see that green on green onion has come out properly.
The background of FE can deliver up to 8 palettes * 15 colors, but to do it, TSA has to be considered and it was hard to make it manually.
Therefore, we did not care about TSA, we reduced color to 16 colors and used it.
Therefore, we did not care about TSA, we reduced color to 16 colors and used it.
However, since FEBuilderGBA has a color reduction function that takes TSA into account, it is possible to increase the number of colors more.

From the menu “Tools” → “Color Reduction Tool”.

The color reduction tool will be displayed.

Sets the original file and the save destination of the converted image.

Click the start button.
Color reduction processing is started.

Let's see the completed image at the edge.
The pallet is allocated properly.

Let's just set this image to BG.
Please press “Image setting”.

Please select “Background”.

Since the background screen appears …

Please select the background of the prologue.
With FE8J, ID:0x25.
(Please be aware that ID is different for FE8U.)

Please press the “image reading” button and select the reduced color image.

The image is loaded.

Please start the game.
Two people talking in front of ramen should come out.

Currently, FEBuilderGBA is decreasing color using the K-means method, but this algorithm is vulnerable to gradation.

Pyramid original image.

16 color reduction color.

Reduced color considering TSA with FEBuilderGBA

Unfortunately, the boundary of the gradation did not come out neatly.
In this case, you can either correct it by yourself, based on the image of FEBuilderGBA, or give up with 16 colors subtractive color.