Spacer One...The Game shadows use only three palette colors that are translated into three shadow shades for resources. The easiest way to make the shadows for a resource is to use a good Graphics Editing program and open and enlarge a resource that is already on the "
resources.pcx" sheet. IF the resource is a copy of just one square from this sheet (like I upload them for copy and paste procedures), you can Open the one square...as long as the resource is in the position desired in the square, (that is where you want the Resource to appear on the Game Map square), you can then open the "
resources_shadows.pcx" sheet and select the three shadow shades that are used for shadows from that sheet, one at a time. It does not matter that the colors will not be the exact same colors from the shadows used on the sheet when you place them around your resource on the Other sheet because after you copy and paste the finished shadows back to the resources_shadows.pcx sheet, the correct three shades that this sheet uses will be applied to the shadows made. hope that made sense
Look at any Game Resource and also look at the shadow that was made for it. This will show you the general area, and direction for the shadows. It will also show you where the three colors that are used for shadows are used.
...With the Resource enlarged, place the Shadow colors around your new resource and after you complete the shadow, simply erase all pixels of the actual Resource and you will then have the shadow in the exact place within the frame to line up where it should go with the Resource. Copy the Frame and shadow and keep this for use. You can then Copy the shadow and paste it onto the Same Square as the resource uses on the resources.pcx sheet to keep the shadow and Resource lined up as they go together in the game. select the inside edges of the entire frame to copy and then select the area where you will paste the shadow on the resources_shadow.pcx sheet the same way. The Game engine puts both the shadow and the resource together from these two sheets. This is why you want to maintain the position for both the resource and the shadow exactly. Example: if a Resource uses the 1st square on the resources.pcx sheet, the resource shadow for that resource will use the 1st square on the resources_shadow.pcx sheet.
Make an extra set of the two .pcx resource and shadow sheets so you can use them to test your resource with shadows in the game.
...actually all very simple, just look at the game resources and also the shadows used for them by opening Both Files in your Graphics Editing program.
In general, you will have the shadows toward the NW direction and use the three shadow shades from Dark Green to almost white. Those colors will be translated into the actual shadow shades used by the Game.
I color the Frames for the resources and the shadows Black so players can simply copy the images INSIDE the frames when copying and pasting the images to their Game sheets. Just a way of keeping the Resources and the SHadows in the correct places. Hope I have not confused you by trying to explain any of this. It is perhaps the easiest and least complicated thing one can do concerning game graphics.

Without Shadows to ground them, most resources will appear to be floating above ground level.