tranparent alpha channel selection

[REGNEAULT]

hello all,
I just launched a rendering of an object on a black background, TIFF with alpha channel. When I open my document on photoshop, I run a selection from my alpha, I get my selection to another layer. The problem is that the area is transparent. I wish what is completely opaque.
Thank you for your help

[jbeau]

Then assign non-glass materials to the parts that your want opaque or make your glass color 100% black.