Some things I learned in the process...........
1. First of all, write every measure down and identify what the numbers are for, that way if something goes wrong you can go back and check. ( I have a sheet for each item created)
2. Whenever you have to SELECT the image (the first time to determine the width and height and later to copy it to the final .png file) I have found that it's better to do it BEFORE you scale it. That way the selection is more precise.
3. Make a list of every item in the .png file, that includes:
INDEX, colors used and SRCX.
Omit the first item, since it doesn't have color and the INDEX is always 0.
For example:
(INDEX)#1. yellow (17)/red(14)(COLORS) /44 (SRCX)
#2. blue (2)/beige (0)/91
#3. dark green (4)/green (7)/137
and so on....
It will come handy when you write the .dat file and you will have all the data in case you need it again.
Hope this helps a little!...............

Jade