[SNES] How does the 4bpp format work?

[Zero One]

I'm trying to get some graphics from the SNES to draw properly in C#, but I don't understand how the 4bpp format works.

The hex found at 0x1B0040 in Super Metroid:

Code Select Expand

00 00 E2 00 A4 00 E8 00 10 00 2E 00 4A 00 8E 00
FF 00 FF 00 FF 00 FF 00 FF 00 FF 00 FF 00 FF 00

is somehow supposed to form a %, but I don't know how. I've been doing some reading and I know it has something to do with bitplanes, but I haven't found any resource that explains it simply enough for me to understand. I'm hoping somebody here can help me with it.

[P.JBoy]

First thing to read is this

[Zero One]

Ok, that and another document helped me a bit. So far, I know that the first row of bytes determines which pixels are coloured, but only bytes 00, 02, 04... etc. I did manage to successfully draw a % in Paint using the data from those bytes, but I still don't understand where the palette information comes from. Have I managed to pick a bad tile to learn this with?