Glide Bitmap Palette https://github.com/bumptech/glide/wiki/Custom-targets#palette-example

PaletteBitmap.java

public class PaletteBitmap {
    public final Palette palette;
    public final Bitmap bitmap;

    public PaletteBitmap(@NonNull Bitmap bitmap, @NonNull Palette palette) {
        this.bitmap = bitmap;
        this.palette = palette;
    }
}

PaletteBitmapResource.java

public class PaletteBitmapResource implements Resource<PaletteBitmap> {
    private final PaletteBitmap paletteBitmap;
    private final BitmapPool bitmapPool;

    public PaletteBitmapResource(@NonNull PaletteBitmap paletteBitmap, @NonNull BitmapPool bitmapPool) {
        this.paletteBitmap = paletteBitmap;
        this.bitmapPool = bitmapPool;
    }

    @Override 
    public PaletteBitmap get() {
        return paletteBitmap;
    }

    @Override 
    public int getSize() {
        return Util.getBitmapByteSize(paletteBitmap.bitmap);
    }

    @Override 
    public void recycle() {
        if (!bitmapPool.put(paletteBitmap.bitmap)) {
            paletteBitmap.bitmap.recycle();
        }
    }
}

PaletteBitmapTranscoder.java

public class PaletteBitmapTranscoder implements ResourceTranscoder<Bitmap, PaletteBitmap> {
    private final BitmapPool bitmapPool;

    public PaletteBitmapTranscoder(@NonNull Context context) {
        this.bitmapPool = Glide.get(context).getBitmapPool();
    }

    @Override 
    public Resource<PaletteBitmap> transcode(Resource<Bitmap> toTranscode) {
        Bitmap bitmap = toTranscode.get();
        Palette palette = new Palette.Builder(bitmap).generate();
        PaletteBitmap result = new PaletteBitmap(bitmap, palette);
        return new PaletteBitmapResource(result, bitmapPool);
    }

    @Override 
    public String getId() {
        return PaletteBitmapTranscoder.class.getName();
    }
}