If you are using Photoshop this is how you set your working profile to sGray:
1) On the top tool bar click on Edit or SHFT+CTRL+K
2) This brings up your "color settings" window. You will see an area on this called Working Spaces. It has the following 4 select drop downs:
- RGB
- CMYK
- GRAY
- SPOT
3) Click on the Gray working space drop down and change it to sGray. It should be the last option in the drop down under Black & White.
4) Hit okay, this should save this change to your Photoshop custom color profile.
Now when working on any of the BMPs that need to be grayscale (waterd.bmp, gndtype.bmp, etc.) open up those files and change their mode.
1) Click on image
2) From the popup menu that appears click on mode.
3) A side menu to the right appear with several options.
- Bitmap
- grayscale
- Duotone
- Indexed
- RGB
etc.
Select Grayscale.
If are working on a PSD that has layers do not flatten. If you flatten it will collapse all your layers into one. You do not need to flatten to change to grayscale. When you save your file out to a BMP then you will wantto flatten and then save to BMP.