1. Channels: Horizontal RGB row. This corresponds with red, green and blue parts in the picture, but changes
also secondary colors, because these colors are having some red, green and blue in them.
2. Signals: Vertical RGB column. This subtracts or adds red, green, blue from or to the filmed picture.
Matching and finetuning colors
Matching and finetuning colors is not so simple as it looks, because changing colors in a camera works different
if you compare it with painting. It is important that you realize that the cells from the sensor (photovoltaic cells) do
not carry any color information, only luminance information. In other words: the cells will make colors in the picture
more brighten or darker in such a way that the balance between the colors shifts.
You need to know that the processor in the camera, for example, makes everything in the red parts red. That
does not mean that everything in the red parts IS red! Even if there are a few pixels green or blue, the sensor
notifies it and will make them red as well. That is why colors can look different in a camera, then when you are
painting.
Best Practices:
1.
There is no database or any tutorial that can help to match colors between specific camera systems of different manufacturers. Every
camera system works different and so the color matrix does. Changing a number in a cell, for example, in 256 in the matrix of the CM70
series camera, does not mean that this will change in exactly the same color in the picture from an another camera.
2.
Practice a lot to learn for yourself what the best settings are to match the colors between the CM70 series camera and a camera from
an another manufacturer.
3.
Read the paragraphs "channels and signals," "subtracting and adding colors" to learn about the matrix.
Subtracting colors
You can subtract colors using numbers above or below zero in the same cell or in a cell of the same row.
1. For example: If you change the number in the green channel > Red signal in a number above zero, it means
that you are subtracting the red signal from the green channel, making green parts purple, because the
camera sensor removes red into the green parts of the picture. Red and yellow parts become more green, as
the red signal is decreased leaving a green tint behind. I you have a sharp eye, you can see that other colors in
the picture become slightly lighter. By changing the same number in a number below zero, you have the same
result, but other colors in the picture become slightly darker.
2. If the number in the Green channel > Green Signal is changed with the same amount as in the Green channel
> Red signal, green is subtracted from the picture, removing the greenish tint from the yellow and red parts. This
makes the colors as they where before, but less intense and darker (because light is removed and not color).
Remember that:
1.
+256 in G-R = Red signal is subtracted from the green channel, changing the balance between green and red towards green. This
means that red pixels in the picture will turn slightly into green and since there a lot of red pixels are in red and yellow parts, a greenish
tint is "left behind" in the picture. +256 in G-G = Green is subtracted from the green channel, changing the balance between red and
green as it was by removing the greenish tint from the picture. Light is removed from the picture, colors become less intense and darker.
2.
+256 in a cell makes the picture slightly lighter, while -256 in a cell makes the picture slightly darker.
3.
Subtracting a color from the picture affects the colors from the whole picture, because there are also pixels from that color in other
colors in the picture even if you cannot see them. See the pictures below:
Red and yellow parts green. left: +256, right: -256 Without the greenish tint. left: +256, right: -256
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