Triangular Pyramid Image and Color it

Please Can Somebody tell me how to generate a triangular Pyramid image of 2 by 2 with height of 200 pixels and the base of 200 pixels; and Color the image in any two colors "http://www.google.com/imgres?q=triangular+Pyramid+image+of+2+by+2&hl=en&tbo=d&biw=1366&bih=541&tbm=isch&tbnid=hhxBKdNeShxfdM:&imgrefurl=http://www.analyzemath.com/calculus/Integrals/volume_square_pyramid.html&docid=Ts_z5lT0xhYuyM&imgurl=http://www.analyzemath.com/calculus/Integrals/volume_square_pyramid_2.gif&w=322&h=312&ei=j0O6UKCyKPCB0QHk_YH4CA&zoom=1&iact=hc&vpx=935&vpy=179&dur=12880&hovh=221&hovw=228&tx=102&ty=244&sig=116099075241339748532&page=1&tbnh=141&tbnw=150&start=0&ndsp=22&ved=1t:429,r:20,s:0,i:147" THIS IS AN EXAMPLE OF 2 BY 2 TRIANGULAR PYRAMID THAT I'M TALKING ABOUT. I would like to have codes that imshow a triangular Pyramid Image and color each with two diferent color such as Blue and Red. Can somebody do that.

[Image Analyst]

What does 2 by 2 mean? You mean a really really small quantized rectangle of 2 by 2 at the center of a 200 x 200 square image? That's not really a triangle. It's just some pixels like

    0 255
  255 255

only 3 pixels!

[Walter Roberta]

this one is an Example of the Triangular Pyramid that I'm looking for, but when I copy this code top MatLab, It gives me a One by one Triangular, instead of two by two. But thank you Image Analyst, whoever your name is.

[Image Analyst]

That explanation does not help at all. I still don't know what 2 by 2 means. 2 what by 2 what? Pixels? Can you try to draw the values like I did. And I'm not sure what code you copied to MATLAB. The stuff above was not code - just pixel values. And the code in my answer below draws a triangle just fine.

[Image Analyst]

Oh! Do you mean you want two complete rectangles side-by-side? If so, I gave you code for one triangle below. All you have to do is repeat it with different vertices. Simple.

[Walter Roberta]

Yes, two complete rectangles side-by-side

[Walter Roberta]

Yes, two complete rectangles side-by-side. Therefore, please what is the codes.

[Image Analyst]

Like I said: I gave you code for one triangle below. All you have to do is repeat it with different vertices. Simple. Just change x and y. Surely you can do that. It's so trivial that I'm not going to do it for you.

Answer 1

[Image Analyst]

I showed you the concepts in this solution so it should not be too hard for you to adapt that. If you want to do it a different way than I did it for you there, you might look into poly2mask(), if you have the Image Processing Toolbox. In fact that's a much easier way since you have triangles.

Alright - haven't heard back from you so I guess you need more help.

x = [100 150 50];
y = [50 150 150];
redChannel = 255 * poly2mask(x, y, 200, 200);
greenChannel = 255 * ones(200);
blueChannel = zeros(200);
rgbImage = cat(3, redChannel, greenChannel, blueChannel);
imshow(rgbImage);
axis on;
axis square;
axis image;

[Cesar]

yes more help

[Image Analyst]

Do you have the same assignment at Walter Roberta? Cesar, I gave you the entire solution to your assignment in http://www.mathworks.com/matlabcentral/answers/63312#comment_129804. Unfortunately you can't now turn it in as your homework because I did it all for you.