Sigma patents a plan for perfect white balance control

Cityscape showing scene shot with two different white balance settings
Sigma's new patent could make white balance measurement much more accurate for artificial light shots like our cityscape. (Image credit: Future)

Sigma's new patent is described on the Japanese J-PlatPat site, the Japan Platform for Patent Information, and since this is translated by computer from the original Japanese, we hope we haven't garbled it too much.

Sigma's patent appears to use sensor technology already included in camera designs to make a much better guess at the light source being used and hence make some much more intelligent gain adjustments during image processing for more accurate and/or neutral colors.

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Rod Lawton

Rod is an independent photography journalist and editor, and a long-standing Digital Camera World contributor, having previously worked as DCW's Group Reviews editor. Before that he has been technique editor on N-Photo, Head of Testing for the photography division and Camera Channel editor on TechRadar, as well as contributing to many other publications. He has been writing about photography technique, photo editing and digital cameras since they first appeared, and before that began his career writing about film photography. He has used and reviewed practically every interchangeable lens camera launched in the past 20 years, from entry-level DSLRs to medium format cameras, together with lenses, tripods, gimbals, light meters, camera bags and more. Rod has his own camera gear blog at but also writes about photo-editing applications and techniques at