RHDN Forum Archive - sprite compression

Hi everyone, I'm trying to hack compressed sprite in Pokemon blue but can't find a way to add/change sprites converting them in hex code. for example if i have a .bmp image like this

and i want to turn it into this

Code:

557D 3C25 4CDF AAE5 3C0A 9A55 56CA
5052 97FF 5385 B429 27EB 9622 157A 3093
0BF5 AB74 6048 9092 7FE9 2962 6F48 51B2
25B7 8204 8811 A2D6 A308 C2A8 12B0 B5E0
8626 25B5 0530 9CB8 A6A2 671E 0812 D08B
A496 3182 38E2 2088 8D11 4E55 F52A 3A5A
314C 3B90 4861 4E48 88C2 74A6 D148 5918
DD4A 8B7E 2D08 6306 A14C 1068 8A08 B52A
21B5 A220 8148 759A 2152 174C 1252 EA16
2621 FF25 A236 18B7 6962 7414 D60B 858C
5614 D392 193B 7EA3 8204 8816 681C 9626
308E 3541 D48E 50F2 5E0A 0495 8A4E 1C70
E782 0B46 19A5 4652 2637 B696 41C6 2A25
1504

how can i do?

i found a document written by Tauwasser that explains the algorithm of sprite compression in Pokemon rbgy, but it's written in german and i don't understand it (i already tried to translate it with automatic translators but the translation is incomprehensible). is there anyone who can explain it to me?
here is the link:http://magicstone.de/rhwiki/article/Grafikkomprimierung_PKMN_RGBY

Thank you in advance