Much also depended on the availability of detailed information about the original coloration of the scene that was photographed. The man behind the camera had to name the colors present in his subject, record them accurately, and give enough context so that production workers could recreate what the photographer saw. On occasions when they lacked sufficient information the workers used their own judgment and sometimes, no matter what the photographer wrote, they gave color values and shadings that seemed right to them. Frequently they worked from hand-colored versions of black and white prints and the artists who did the coloring might themselves use artistic license to make what seemed to them to be an appealing result.
The photochroms themselves could be mass-printed as inexpensive postcards (and in that time of penny-stamped cards millions of them were) or they could be produced as large high-resolution prints.
The photos which follow come from a Library of Congress collection of high-quality prints that the Detroit Publishing Co. produced in or near 1899. They show places and people in Tunisia. Apart from the brief notes accompanying them there's nothing that can be found out them. A publisher's catalog calls them "Views of Architecture and People in Tunisia." I believe the absence of narrative takes little away from the prints. See if you agree. As usual, click an image to view full size and then hit the escape key to return to the blog post.
the American Photochrom Archive gallery on photochrom.com
Catalogue F. Scenic, architectural and marine views (Detroit Photographic Co., 1899)
About Photocroms on photocrom.com
The Photochrom process on bluemonocle.com
Photochrom in wikipedia
World Digital Library
Photochrom Prints on the Library of Congress web site
the Detroit Publishing Company Collection on the Library of Congress web site
Detroit Publishing Company Photographs on the Library of Congress web site
Detroit Publishing Co. in wikipedia
The Miracle of Photochrom on creativepro.com
Photochrom on photopreservation.com
 See the list of sources for information about the Photochrom process and its history.
 The prints are from the Photochrom Prints collection of the Prints and Photographs Division of the Library of Congress. Click image to enlarge.