Pardon for a simple question Can You tell me how to set brightness what do I need to do it because I need to change an image for shadow highlight and that stuff I can resize rotate but I cant find the correct function or do I have to handle the pixeles by myself? please  ;)

Hi everyone I tried to use Vampyre Imaging library looks so cool but there is one problem a simple I guess.
Actually can you tell me how show an image in a Timage using the function Imaging.rotate(img,90);
I tried to do this simple example
var img:TimageData
initImage(img)
imaging.loadfilefrom('x:\y.bmp',img)
Imaging.rotate(img,90);
something like before I did in code but I was wondering how could I but this image in a Timage and how to assign into a bitmap. Thanks for reading see ya  :o