photoshop saving pls answer

[MnM]

hi frnds,

i was working in photoshop, wen i was going to use blur tool it said to convert to RGB to work. i converted. then i saved my work but wen i open it again it was grayscale.Then i worked on fresh one.I tried conerting it back to Index and save but there was one option in that i wanna choose my colors whether 256 or so...

I want help how to retain the lf-2 style color mode