C# image processing pixel location

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i have follwing code

C#

Color [] cl = new Color[20];



          cl[0] = myBitmap.GetPixel(array_X[0], array_Y[21]);
          cl[1] = myBitmap.GetPixel(array_X[1], array_Y[22]);
          cl[2] = myBitmap.GetPixel(array_X[2], array_Y[23]);
          cl[3] = myBitmap.GetPixel(array_X[3], array_Y[24]);

and i want to get average color of all these points like
Color cc = Average(cl[0],cl[1],cl[2],cl[3]);
for example if cl[0]= 255,255,255 and cl[1]= 0,0,0,; cl[2] = 255,255,255
then avearge should be 255,255,255

how i can do this please suggest some ways??

Posted 7-Apr-13 17:28pm

irfanniazi

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-04-07T18:40:00

Solution 2

In addition to the correct answer by Kenneth who addressed only WPF:

In System.Drawing, use System.Drawing.Bitmap.LockBits:
http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.lockbits.aspx[^].

—SA

Posted 7-Apr-13 18:40pm

Sergey Alexandrovich Kryukov

Kenneth Haugland · Answer 2 · 2013-04-07T18:28:00

Solution 1

Dont use GetPixel, you should use CopyPixel[^] instead, as GetPixel is veeeery slow, arrays are much nicer :)

You forgot to specify if this is WPF or WinForm.

Posted 7-Apr-13 18:28pm

Kenneth Haugland

Comments

Sergey Alexandrovich Kryukov 8-Apr-13 0:41am

Agree. I credited your advice, but only for WPF (or course, this is OP's fault, first of all).
I added my advice for System.Drawing, please see Solution 2.
—SA

irfanniazi 8-Apr-13 6:52am

Dear i am OK with GETpIXEL.it is an winform actually now i want to get the color which is more occuring in these pixels i.e if a circle contains 10 points out of which 7 are white and 3 are black then i want a method which should take these points clor and result should be that color is white as majority points are of white color???

Kenneth Haugland 8-Apr-13 6:57am

Shirley you cant call me dear. However, you should use the fastest method as you might might as well learn the best method.

irfanniazi 8-Apr-13 6:53am

as we do average like avg(45,35,40) then avg will be 40 in the same way i want to know average of colors how to do this in c#??

Kenneth Haugland 8-Apr-13 6:56am

Sounds like you should convert the pricture to grayscale first.

irfanniazi 8-Apr-13 7:03am

is it neccesrry to convert image into grayscale???

Kenneth Haugland 8-Apr-13 7:06am

You would have to explain what you are trying to achieve first. I cant say I do from your original question.

irfanniazi 8-Apr-13 7:22am

so far i have designed an answer sheet like the one used for filling mcqs answers. i have drawn circles using Drawellipse() method. and i have stored the points which are residing iside the circles now i want to get color of all these pixels and then to get average color of all these points.

cl[0] = myBitmap.GetPixel(array_X[0], array_Y[21]);
cl[1] = myBitmap.GetPixel(array_X[1], array_Y[22]);
cl[2] = myBitmap.GetPixel(array_X[2], array_Y[23]);
cl[3] = myBitmap.GetPixel(array_X[3], array_Y[24]);
now i eant to get average color of these points i.e cl[x] = Average(cl[0],cl[1],cl[3])

Kenneth Haugland 8-Apr-13 7:25am

I got that, but this does not make any sence to me:
"for example if cl[0]= 255,255,255 and cl[1]= 0,0,0,; cl[2] = 255,255,255
then avearge should be 255,255,255"

irfanniazi 8-Apr-13 7:35am

yup that is what i want to do but how to get average of colors in c#??

Kenneth Haugland 8-Apr-13 7:39am

Im saying that I dont understand what algorithm you want, the most natural would be Average=(255+255+0)/3 for each color, no?