image or video has a chrominance value of zero media content that includes a color image or color video is represented in fig1 an industry standard luminance and chrominance color space is called u201c lab u201d for lightness or luminance plus u2018 a u2019 and u2018 b u2019 color channels that can be used to separate components of images and video fig2 is an u2018 a u2019 channel representation of fig1 shown in grayscale and fig3 is a u2018 b u2019 channel representation of fig1 shown in grayscale of course our inventive methods and apparatus will apply to and work with other color schemes and techniques as well for example alternative luminance and chrominance color schemes include u201c yuv u201d y luma and u2018 u u2019 and u2018 v u2019 represent chrominance channels and u201c ycc u201d also a dual chrominance space representation let 39 s first discuss the additive and subtractive effects on fig2 and 3 fig4 illustrates a representation of the result of adding the u2018 a u2019 channel fig2 with the u2018 b u2019 channel fig3 fig6 illustrates a representation of the result of subtracting the u2018 b u2019 channel fig3 from the u2018 a u2019 channel fig2 the result of subtracting the u2018 b u2019 channel from the u2018 a u2019 channel yields reduced image content relative to adding the two channels since the u2018.