1. A color image forming apparatus comprising: first optical detection means for detecting light reflecting characteristics of an unfixed toner image formed on an image carrier or a transfer material carrier; second optical detection means for detecting the light reflecting characteristics of the toner image which is transferred from the image carrier or the transfer material carrier onto a transfer material and is fixed; density control means for forming a test image on the transfer material and controlling image forming conditions in accordance with a detection result of detecting the test image by said second optical detection means; and control means for controlling to execute density control by said density control means in accordance with a detection result of said first optical detection means.