DigitalColor Meter show other colors as created in application.

Hi community.
I'm not an expert in color and maybe I make a mistake or don't understand the workflow.
I create different colored boxes in TextEdit and other application. Both use the same OS X color tool to define the color.
I define the color RGB. R in one box, G in second box and B in third box.
See attachement with example for red, it means R=255 / G=0 / B=0.
Green box is R=0 / G=255 / B=0
Blue box is R=0 / G=0 / B=255
When I use DigitalColor Meter from OS X 10.6 it show other color when I move over the different boxes.
Result of DigitalColor Meter is:
Red R = 255, G = 19, B = 20
Green R = 0, G = 251, B = 52
Blue R = 45, G = 44, B = 250
What is wrong ?
What is my mistake ?
Do I don't make the right workflow ?
Regards
Jochen

@Roger
Thanks. Now clear Help of DigitalColor Meter.
which gives you a read-out in different formats used by different programs.
In Help is following workflow.
Gehen Sie wie folgt vor, um Farben mit dem Programm "DigitalColor-Farbmesser" anzupassen:
Öffnen Sie das Programm "DigitalColor-Farbmesser". Sie finden dieses Programm unter "Programme" > "Dienstprogramme". Programm "DigitalColor-Farbmesser"
2. Wählen Sie aus dem Einblendmenü einen Farbraum aus.
3. Bewegen Sie den Zeiger über die Pixel, die Sie anpassen möchten.Beim Bewegen des Zeigers werden die entsprechenden Farbwerte angezeigt.
My simple translation is:
Do you do following to adapt colors with DigitalColor Meter
1. Open application DigitalColor Meter ... and so on. OK
2. Select from menü the color system. OK
3. Move the mouse about pixel which do you will change. By moving the mouse the color of pixels will show.
I cannot see in which way I can change the color in original. I can only make a copy of actual values of color in different color systems.
Jochen

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