help w/ Image transparency & object Collision

[Marman57]

I am new to programming and my first game I am working on is a side scrolling game and I am trying to remove the white box that forms around the images that I blit into my game. What do i need to do to make the white box transparent.

Also I am having a hard time making collisions with objects. I can get my player to jump and he will land on the object but when he walks off the object the player.gravity is a adjusted to the object.y and he doesn't return to the ground. All the expressions I have tried either stops the player from jumping or just doesn't return him to ground level once on the object. Any help will be greatly appreciated.

[JorDy]

well for transparency use the Alpha channels (R-G-B-Alpha) so when blitting an image it should be:
image:blit(x, y, Image source, [sourcex, sourcey, width, height], true)
the true at the end is enabling the alpha channel
for transparent colours use Color.new(r, g, b, a) the max is 255 for all R-G-B-A
as for gravity im not sure, best way for collision is to use a collision map check PSPGolf for that

[Marman57]

I am not exactly sure on how to set this up. Can you please elaborate on what you mean by

"for transparent colours use Color.new(r, g, b, a)"

I did set the alpha channel to true in my image:blit(....) but nothing changed. Do i need to do anything to the actual image in Windows paint or other image editing program. Thank you.

[shifty_bill]

i use photoshop CS2 to make my images transparent

start with the magic wand selector, select the background,
ctrl + shift + i = invert selection
then
ctrl + x (cut)
ctrl + v (paste)
then delete the background layer

and there we go a transparent image