semi transparency is done with an alpha channel.. or rather an 8bit alpha channel.
you can think of an individual pixel as 3 numbers. 0-255 for red, blue and green.
Now add another number (again from 0 to 255) for 'alpha'. This determines the transparency.
GG *does* support alpha channels but i've no idea how they work in practice..
in photoshop or gimp though you can set the transparency of your brush/pen tool before you use it.
you can think of an individual pixel as 3 numbers. 0-255 for red, blue and green.
Now add another number (again from 0 to 255) for 'alpha'. This determines the transparency.
GG *does* support alpha channels but i've no idea how they work in practice..
in photoshop or gimp though you can set the transparency of your brush/pen tool before you use it.