Hi, i have a problem when i try to render a plane with a image at the transparency node...

the image is 100% black and 100% white, but when i render the shadow apears like the plane still had a little of opacity.

i tried all diferent tipes of light, all kinds of shaders, put the image as a projections, adjusted thealpha gain and offset. i did everything i could, but nothing work.

i put a checker as transparency and didn´t have the problem... just with the image.

i would be VERY happy if someone could help me.

i put the image at my website:
https://www.renansantos.com.br/render.jpg
and also the maya file
https://www.renansantos.com.br/test.zip

my msn is the_renans@hotmail.com

sorry for my english, it´s not very good..
thanks