FOSS gamedev and creative worlds

So I know I just asked a question here not too long ago and this is related in a way but not really. I am using GIMP and working with 16 x 16 pixels. My problem is I make the picture then add an alpha channel. When I get on the game for the image I placed in textures shows as just an empty box in the inventory and when I place it in the equipment bar thing ( I don't exactly know what it is called), it just shows as 2 little tiny white squares. I must be doing something wrong with the texture. Please help.....
I have already looked at this - http://rubenwardy.com/minetest_modding_book/chapters/creating_textures.html

Can you show the code that registers the item?

l think wield doesn't support semi transparency but inventory images do

Be sure to use hard edge in gimp. Make it so everything is transparent or solid colour.

Thank you all but I found the problem of why it wasn't registering correctly. I misspelled the picture name in the textures file.

Glad to hear that you found the problem.