Computer Science Canada

RGB and whatdotcolor
Author:  Insectoid [ Tue Nov 11, 2008 2:21 pm ]
Post subject:  RGB and whatdotcolor
Well, I have been working on a program that takes a picture, gets the information for each pixel (x, y, color) and saves it to a text file before displaying the picture in an interesting way to the screen, using the numbers in the text file. Unfortunately, I am restricted to the 256-bit limits of whatdotcolor (used to get the color information for the pixel). So, is there a way to get the color information in RGB format using whatdotcolor, or even directly obtain the info from the jpeg image?
Author:  TheGuardian001 [ Tue Nov 11, 2008 3:37 pm ]
Post subject:  Re: RGB and whatdotcolor
yes, you can use the RGB.GetColour command to get RGB values based on the Turing Colour number.
Turing:

RGB.GetColour(colournum,real_variable,real_variable2,real_variable3)

will return the RGB values into the three real variables you give it.
Author:  The_Bean [ Tue Nov 11, 2008 4:13 pm ]
Post subject:  Re: RGB and whatdotcolor
The problem with using RGB.GetColour is that you first need to know what the colour is you want to get the information for, so you have to use View.WhatDotColour, which returns a colour inside the 256 range, and your back to where you start.

To get a better range of colours you need to use RGB.SetColour and RGB.AddColour
You can only add up to 1024 or something colours but that still gives a pretty good range.

Turing:

View.Set ("graphics:1000,216,nobuttonbar,offscreenonly")
var nothing : int

%Sets all the colours
for r : 0 .. 9
    for g : 0 .. 9
        for b : 0 .. 9
            if r * 100 + g * 10 + b < 256 then % if the colour is within the the current 256 range
                RGB.SetColour (r * 100 + g * 10 + b, r / 9, g / 9, b / 9) %changes the colours under 256
            else
                nothing := RGB.AddColour (r / 9, g / 9, b / 9) % adds new colours ontop of the 256
            end if
        end for
    end for
end for

%draws the lines
for r : 0 .. 9
    for g : 0 .. 9
        for b : 0 .. 9
            Draw.Line (r * 100 + g * 10 + b, 0, r * 100 + g * 10 + b, 199, r * 100 + g * 10 + b)
        end for
    end for
end for

var xm, ym, bm : int
var r, g, b : real
Text.Colour (999)
Text.ColourBack (0)
loop
    Mouse.Where (xm, ym, bm)
    RGB.GetColour (View.WhatDotColour (xm, ym), r, g, b)
    locate (1, 1)
    put "Colour ", View.WhatDotColour (xm, ym) : 3, " is made of: ", r : 3 : 2, " red, ", g : 3 : 2, " green, ", b : 3 : 2, " blue."
    View.Update
    exit when hasch
end loop
Author:  Insectoid [ Tue Nov 11, 2008 4:32 pm ]
Post subject:  RE:RGB and whatdotcolor
Wow...that looks very comlicated and makes little sense...Does it add colors to the 256-bit range? And will it capture the RGB exactly?
Author:  The_Bean [ Tue Nov 11, 2008 4:44 pm ]
Post subject:  Re: RGB and whatdotcolor
It won't get the RGB exactly, but it comes a lot closer than what turing already has. The main thing you want is
Turing:

%Sets all the colours
for r : 0 .. 9
    for g : 0 .. 9
        for b : 0 .. 9
            if r * 100 + g * 10 + b < 256 then % if the colour is within the the current 256 range
                RGB.SetColour (r * 100 + g * 10 + b, r / 9, g / 9, b / 9) %changes the colours under 256
            else
                nothing := RGB.AddColour (r / 9, g / 9, b / 9) % adds new colours ontop of the 256
            end if
        end for
    end for
end for
%0..9 for each colour so you get an even representation for each colour
%We switch from RGB.Set to RGB.Add because if we try and set a colour over 256 turing gives an error because
%that colour doesn't currently exist.  So we then add colours.
%We can't get any better definision out of turing because it has a max of 1024 colours
%10*10*10 is 1000 so were really close with this already
Author:  Insectoid [ Tue Nov 11, 2008 4:53 pm ]
Post subject:  RE:RGB and whatdotcolor
Hmm...Perhaps I'll just give this a go in Java. Turing is apparently to limited for this kind of activity.
Author:  SNIPERDUDE [ Wed Nov 12, 2008 8:13 pm ]
Post subject:  RE:RGB and whatdotcolor
It is best if you make the RGB retrieving programme in another language, I used VB for mine.
Author:  Insectoid [ Wed Nov 12, 2008 8:14 pm ]
Post subject:  RE:RGB and whatdotcolor
If only I could get the Robot class to work in Java...

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