The photographer's stamp on the back of this small (2.5x4 inch) portrait reads:

C. C. Curtis. Photo. Traver, Cal.

That would indicate that this picture was taken sometime during the mid-to-late 1880's.

This woman appears to me to be Asian (see close up just below). 

 I have read that during this time period Traver did have a Chinese neighborhood.

C. C. Curtis (Charles Clifford Curtis) is considered one of the most important photographers of central California during this period. e.g. He documented the lumber industry of this area, including the cutting of Giant Sequoias.   He was an early member of the Kaweah Colony, an utopian socialist commune in the Three Rivers area.  And some of his photos of this group have survived.   

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 This is a photo of the Porterville Enterprise office. The Enterprise was a weekly newspaper, between 1888 and 1908, edited & published by M.J. O'Clancy. Like many newspapers of the times they also did printing jobs.
On the photo's back is written: "Porterville, Apr. 1895"
(Added 5/11/14)  By the time of this photograph The Enterprise was owned and run by the Lumley brothers (Aubrey and Gerald), who were known for their somewhat audacious behavior.   I believe that Aubrey is the gentleman seated at the left side in this image and Gerald is to the far right, dressed very dapper with a straw boaters hat... although it could be the other way around (The two brothers looked very much alike).

Close-ups from the photo above:

 The typesetting this man (above) is holding forms the word "PICNIC" in large letters.

(About O'Clancy and his newspaper, in 1892) ...
"The Enterprise was established April 21, 1888. On February
16, 1889, the first issue appeared, under the supervision of the present
publisher, Mr. J. O'Clancy, who has worked the journal up to such an extent that
it now lays claim to being one of the leading papers in the county, both in
circulation and influence.
Mr. O'Clancy is a native of Cork, Ireland. He spent the most
of his youth traveling, came to the United States in 1886, and traveled through
Canada to the Pacific Coast. He first entered into the newspaper business on the
San Jose Mercury at San Jose as a reporter. After five months' experience he
took charge of the Fresno Daily Democrat. That journal going under after the
last presidential campaign, he came to Porterville, purchased the Enterprise,
and runs a pretty radical kind of paper, although Democratic in politics."

Excerpt from:
Memorial and Biographical History of the counties of Fresno, Tulare and Kern,
California.(page 214). Published 1892 by Lewis Pub. Co. in Chicago.