How to chang the color of imported Jpeg in illustrator

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This is a article to introduce my experience,I wish it is useful to you.

I import a White-Black JPEG into illustrator,and want to change its
color as same as the color of text(see attachment 1). First I use the
method of TRACING,after trying,I found it can't reach my aim. there
are White background leaving(see attachment 2).

the correct method is
1. change into bitmap format: object > rasterize > bitmap (see
attachment 3,4)
2. Eyedropper your favorite color.(see attachment 5)