Like in Photoshop and many other painting/photo editing program that it lets you set the hardness of the brush.
Is it possible to do this with core graphics? Or I have to use OpenGL
PS. If I have to use OpenGL give me some codes and more details.
try CGContextSetShadowWithColor. The Shadow opacity depends on the shadow-color and the opacity of the drawn object. I believe applying a shadow to a full-tranzparent object is not possible without some masking.
... damn i wanted to add a new comment...