In practice, these three elements are inextricably linked-changes in one facet affect the others. Brightness and contrast together can be considered tonal adjustments. It’s not a process of making a scientifically accurate picture-our visual system is too non-linear, and too mutable.Ĭonceptually, you can break color correction down into three facets: brightness (the overall level of light in an image), contrast (the relative light levels of adjacent areas in and image), and color balancing (adjusting the overall hue of an image). For the very best results, do it by hand.Ĭolor correction is the process of adjusting raw image data so the resulting picture looks realistic. This image may be reproduced and distributed freely.įinally, satellite images of the Earth need to be adapted to the dynamic range and color gamut of display technologies (both screen and print), which are quite limited compared to the real world.īecause of this, it’s very difficult to do automatic or universal color corrections. The squares marked A and B are the same shade of gray.