I use DX7 eclipse and I need code to make(remove back color) inventory item pictures transparent

If you’re using a dx7 engine, then that means you’re using an engine that doesn’t have a rendered gui, which means that the background will always be black or some other colour. The reason for this is that the actual inventory is rendered onto a Picture Box which doesn’t support transparency. If you know how DX7 works, then you can render the gui onto screen and use a ColorKey/Mask to mimck transparency.