I've had a hard time to understand what is the relationship between transparent and alpha channel in Photoshop for a PNG image, I have this screen shot you can see I have a checkerboard background which doesn't have RGB value,my question is
1.When I save this as a PNG image, the checkerboard is transparent, but you can see I do not have alpha channel, why I can have transparent when there is no alpha channel?
2.Is this checkerboard area has the same effect being as a transparent area as having alpha channel?
3.Will this checkerboard area takes up the storage space on my hard drive if no RGB information is stored?
So can you explain to me what the checkerboard area is if there is no color information on this area, I really do not understand what this area really is.