White Design Looks Gray in Preview

[jeffreya]

I thought I saw this mentioned ages ago but can't seem to find it or mention of this. A lot of my shirts are white designs on a black tee and in preview mode the white isn't vibrant but comes across more like a gray image? 

What am I doing wrong or is that just the output of the software? Thanks in advance! Example below.

https://www.zazzle.com/shut_up_kyle_funny_movie_quote_t_shirt-256408770161474488?tc=emc_ProductCreat...

[Fiorenzo]

Checked it out. Not your fault, it's a preview issue. If you check other previews and models, the white looks clean. Tried myself with a simple white text and got the same results. Set a different model and/or preview as default until this may get fixed.