by steps
000000 000000
000000
3383b1 3383b1
3383b1
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00007f
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0000ff
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00ff7f
488590 488590
488590
00ffff 00ffff
00ffff
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528680 528680
528680
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68885f 68885f
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ff7fff ff7fff
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7d8a3f 7d8a3f
7d8a3f
ffff00 ffff00
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ffff7f
ffffff ffffff
ffffff
888c2f 888c2f
888c2f