Completed
Not quite sure why but the black pieces are now working.
1) Create your graphic in photoshop or use any pre-existing graphic (i suggest not using an actually photo as it doesn't really work that well)
2) Open it in preview then save as SGI but give it the file extension .rgb (make sure the file is not above 70KB as it may not work otherwise).
- Make sure the file name is correct to that of what it will be used for, a white chess piece should have the file name WhitePiece.rgb, for the white board graphic WhiteBoard.rgb. If you are making a board theme make sure you include a Border.rgb.
3) Open the Contents Package of the Chess app and locate the styles folder (Chess.app/Contents/Resources/Styles)
4) Create a new folder with the title of the theme you wish to call it.
5) Copy a Board.plist or/and Piece.plist, from one of the pre-existing folders, into your new folder.
6) Make sure that each theme has the following:
for a piece
- WhitePiece.rgb
- BlackPiece.rgb
- Piece.plist
For a board
- WhiteBoard.rgb
- BlackBoard.rgb
- Border.rgb
- Board.plist
The capitals are important!
Hope it Helps!
I've attached a zip of the custom Apple Chess Piece Folder I made so you can test it out.