Method for processing signals representing color pictures
View Patent ↗A method for processing at least a part of a color picture comprises at least one pixel defined by a plurality of color values. Each color value is variable between black and a color clip value. The method comprises, determining for each color value the quantity of the color value above the common clip value, computing a linear combination of the quantities, and for at least one of the color values, outputting a processed color value based on the linear combination.
1. A method for processing at least a part of a colour picture comprising at least one pixel defined by a plurality of colour values, each colour value being variable between black and a colour clip value, with the following steps:
determining the lowest of the colour clip values as common clip value, determining for each colour value the quantity of the colour value above the common clip value,
computing a linear combination of said quantities, for at least one of the colour values, outputting as processed colour value;
the colour value plus said linear combination if said colour value is below the common clip value;
the common clip value plus said linear combination if said colour value is above the common clip value.
2. A method according to claim 1 , with the steps of:
outputting as processed colour value for each colour value;
the colour value plus said linear combination if said colour value is below the common clip value;
the common clip value plus said linear combination if said colour value is above the common clip value.
3. A method according to claim 1 , wherein said colour values are a red value, a green value and blue value, with the steps of:
outputting as processed green value;
the green value plus said linear combination if said green value is below the common clip value;
the common clip value plus said linear combination if said green value is above the common clip value;
outputting the red value as processed red value;
outputting the blue value as processed blue value.
4. A method according to claim 1 , wherein said linear combination is a mean value of said quantities.
5. A method according to claim 1 , wherein said colour values are generated in a white balance step.
6. A method according to claim 1 , with the step of:
digitising signals from CCD arrays and applying a white balance thereto to generate the colour values.
7. A method according to claim 1 , wherein the colour values are retrieved from a previous recording.
8. A method according to claim 7 , wherein an inverse transfer curve is applied to generate the colour values.