After running CMD (the old DOS prompt), you MUST set directory as CTPSpriteTool/Cities !!!

- It's easy to forget, if you have been making other kinds of sprites (such as units), but for each type, the subdirectory MUST be changed (spent 30 minutes learning THAT the hard way)

- Shadow file MUST have Alpha Channel! Same as when you pull Unit graphics out using Sprite Edit, the shadow files don't have alpha channels and won't work without one

- The naming convention for City Tif files is as follows: "GC", then three digits (ex: "098"), then "A" (or "S" if it's a shadow file), then "." (period), then "1", then ".tif"
EX: GC098A.1.tif

- When converting tif files to sprites using Makespr, cities must use three-digits in their name, for example, GC098A. Although that *seems* different from units (which must use 2-digits), the folder numbers can never exceed TWO DIGITS. So that means city tif files must always have ZERO as the first digit. Of course, the game easily handles 3 digit sprites, but they can't be made that way. Same issue as with units.

- Similar to making Unit Sprites, Cities also require a text file to be placed inside the "Cities" folder (NOT inside the numeric folder), but in this case there's no need to change any of the defaults INSIDE the text file. Use an existing text file but rename it using a standard naming convention: "GC", then three digits (ex: "098"), then ".txt"

- Finally, after running CMD and changing the directory to CTPSpriteTool/Cities, type in:
makespr -c 98 (where "98" is changed to the number in the name of the tif file) 

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Preparing the files so they are in the correct format for the Sprite Tool:

- Use GIMP for all the preliminary file editing (getting it to the correct size, adding/deleting city features, etc). Usually I convert the base file to .tif and after doing all the edits necessary to size it, the file is copied into a blank 96x76 .tif file for final processing.
- During the preliminary editing you don't have to worry about format selections, that will be done later.
- After copying the city into the template file (Blank.tif), make sure that none of the city pixels are the same color as the pure white back ground (use the "select by color" tool). This can also be done before copying the file into the template. The "select by color" tool defaults to a "Threshold" value of "15.0" which will include pixels that are not pure white, so be sure to set that value to "0".
- As noted above, now is a good time to re-name the file using the proper naming convention.
- Once that's done, open the file in GIMP and then:
- Layer > Transparency > Remove Alpha Channel (background region will remain white). NOTE: Sometimes your file will not have an alpha channel to delete. If so just move on to the next step. 
- Using the "Select by Color" tool click the white region surrounding the unit
- Layer > Transparency > Add Alpha Channel- Hit the "Delete" key (background now appears clear/alpha)
- File > Export As
- In the next window, select "TIFF image" from the box on the bottom right (if necessary) and click "Export".
- Select "Replace" in the next window (if necessary)
- Another window appears and Compression should be set to "None" and the "Save color value from transparent pixels" box MUST be unchecked. Click "Export", close the file, and repeat with the next one.
