I couldn't read that green text after like... 3 lines. It's just... horrible looking(VERY VERY hard on the eyes).
Here's my tutorial.
Programs Needed:
-Photoshop
-Starforge
-BMP2SCM(duh)
MYTH: You can't make a map picture bigger than 128x128!
TRUTH: False! You can! Have you ever seen Caprice by (U)Bolt_Head? Hehe. I also made a 192_width x 128_height picture. However, 192/256 x 256/192 just doesn't seem to work. Have not tested 192 x 192 yet.
TUTORIAL: Part 1
Open Photoshop. File> New, make it 128/192 height/width, DPI 10, Grayscale, background white(or black)
File> Open, open the picture you want to make into a map, can be a JPG, BMP, GIF, can be any size picture as well.
Making sure you have the picture you opened selected, click on Image> Image Size. Keep it in proportion and change the width or the height, only need to change one.
Still editing the same picture, Image> Mode> Grayscale. Your picture should now be black and white!
Use the Rectangular Marquee Tool, select the entire picture, Edit> Cut. Close the picture you just cut, do not save.
You now have selection of the New file. Edit> Paste. Select the Move Tool and center it if you want/can/have to.
File> Save As. Choose BMP format, click on Save. Make sure to save it in 4bit.
Close Photoshop!
TUTORIAL: Part 2
Run Starforge, New Map, select the Space Platform tileset, width and height of your choice.(the first number is Width, the second is Height).
Save the map as Blank128x128.scm or whatever you like.
In Starforge, Windows> CloseCurrent.
Minimize Starforge and run BMP2SCM. Load the map Blank128x128.scm or whatever you called it.
After it finishes, a new box appears, click on Load Picture, select the BMP you just recently finished in Photoshop. It will do it's thing, detect all colors, assign a number, then remove all duplicates.
When it is finished, you will have a box with some numbers like 0, 1118481, 11184810, etc!
Here's what tileset number to assign these huge numbers. You click on the box under the color, enter the number on the right, and then press enter. You should now be able to go to another # and go back, and it will keep it's new tileset.
#0 = tileset 0(black)
#1118481 = 0
#2236962 = 0
#3355443 = 224
#4473924 = 224
#5592405 = 192
#6710886 = 326
#7829367 = 326
#8947848= 256
#10066329= 256
#11184810= 64
#12303291= 64
#13421772= 128
#14540253= 96
#15658734= 160
#16777215= 160(white)
If you did what I said, BMP, grayscale, 10 DPI, you will ONLY have that many numbers, never more. But you may get less. It's important to look at the number.
When you are finished assigning tileset numbers, click on Conversion> Convert. It will take approximately 1m 45s to 2m 15s to complete the conversion.
When it is finished, click on File> Save As, save it as Barney.scm, if your picture is of Barney(just an example).
You should see a black box appear, and disappear real quick. You are finished! Almost...
TUTORIAL: Part 3
Close BMP2SCM, and maximize StarForge. Open> Barney.scm
Give 8 plays a start location(in the corner of the map, or somewhere where there is not alot of picture to look at), make sure all 8 players are set to human, with the race zerg(or terran or protoss, it matters not). You can rename the player Force to Made by: YourName. After this is all set, click on Tools> Map Revealers, check the box AllPlayers. Modify the Scenario Properties with whatever info you like, then save the map!
It is now ready to be scene on B.Net.
However, if you want people to be able to see it in Single Player, you would have to make Player 8 a computer, and put him in Force2. Voila, All done!
TUTORIAL: Finished.
-This entire process takes me about 7 minutes, from the photoshop editing, to the map making, to picture map making, to editing the map.
-The Space Tileset is a good tileset to do pictures on, usually(some pictures, despite appearing really bright, end up really dark). You got all shades of black/gray/white, and it makes for some wicked pictures. I have not and will probably not make another "tileset # list" for any other tileset. It's easy to do, do it yourself =D.
I have made 3 maps using the above process. They all look cool

Enjoy!