[Jack 3D]

Hi. Thanks for all the replies to my previous posts from a few months ago. I'm importing a b & w high quality 300 dpi jpeg as a texture map into the transparency channel of a newly created shader. The image is some black type on a white background. In the shader panel I've checked off No Light Interactions When Fully Transparent and in the Render panel I've checked off Light through Trans. I'm using the shader on a sphere which has a slightly smaller inner sphere centered within it. The inner sphere has a simple shader applied to it. Only the type is visible on the outer sphere which gives the effect of a line of characters mapped to an invisible spherical surface rotating (if animated) around a globe and casting shadows on the surface of the globe. The problem is that the edges of the letters are not perfectly clean and there are some visible artifacts around them. I'm using what I think are the highest render settings and have even tried importing the image at a higher resolution but still there are these bits of artifacts which show up as ragged auras. Is there any way to get perfectly clean edges on the black and white image I am importing as a texture map? Thanks for any replies. Jack 3D