Hi PTH!
I'm not sure I understand the part about you not knowing how to create the necessary files. I'll explain how this works and you tell me where you get stuck.
First of all, you must have the png you want to import. You can make it with Paint, Photoshop or almost any graphic editor. When you import a png, it must fit a whole graphic sheet, not a part of it like a cell or a row of cells.
Also, your png image must respect the configurations of the graphic sheet, otherwise it will be all messed up when import is completed.
As an example, if you have a graphic sheet with:
cellheight = 32
cellwidth = 32
columns = 3
rows = 2
This means that the png to import must be of height = 64 pixels (32 cellheight * 2 rows) and of width = 96 pixels (32 cellwidth * 3 columns).
In this example you have a graphic sheet with 6 cells, so you should have 6 images into your png, each of them must fit in a cell.
When you have your png ready, go into SGDK2, in the graphics sheets folder, expand your sheet and double-click on "edit images". This opens up the graphic editor that allows you to draw into your graphic sheets cells. Once you are there, you can import your png by going into the menu "file" and then "import image as sheet". Browse to find your png image and open it.
If your png fits the configuration, it will load appropriately. If it does not fit, you will get a message saying that your png doesn't fit the graphic sheet size.
Keep in mind that it is not advisable to make graphic sheets bigger than 1000 px * 1000 px, some graphic cards cannot handle such big images when running a game. If you want to display an image bigger than 1000 px wide or high, it is better to separate it into many graphic sheets.
That's it! Have fun!
Poll