color problem

Hello!
I use vertex-colors in my 2D elements of my program.
I thought I understood the what the color is, but it seems I don't. I thought the color consists of RGB values: RRGGBB. So that 0000ff is blue, 00ff00 is green and ff0000 is red. These colors seem to work, but when I combine them something goes wrong. ffffff which should be white is something like this and ffff00 which should be bright yellow is actually like this.

What's wrong with it?

And what happens instead? We can probably figure out what is wrong if you give us a short table of

Code:

Value   Expected    Actual

where "Value" might be 00FF00, and Expected "Green", and Actual "Blue".

--
Mats

Code:

Value   Expected   Actual
ffffff   white   this
ffff00   this this
00ffff   this this
ff00ff   this this

It's no point to give more colors. It seems that all colors are darker and I can't give exact colors anyway.

Are you storing the colour numbers in a wide enough type? If you stuff "0xff" into a char, for example, you might not get the results you're expecting. An unsigned char would work; or, if you're putting all of the data into one variable, an unsigned long (or unsigned int if you wish I guess).

Beyond that, you might want to post some relevant code.

White is not FFFFFF. It is FFFFFFFF.

Most color is expressed as RGBA, ARGB, or XRGB. What you have expressed is XRGB. If you are in a graphics API and you have alpha blending enabled but set alpha to 0.0f you will not get any colors at the vertices.

OK, I forgot about alpha, because I don't use it. These colors are for rhw vertices. Nevertheless it seems to make no difference. It seems that ffffff and ffffffff give exactly the same result and the problem remains.

I use DWORDs to store colors.

It seems I know the problem now.
D3DPRESENT_PARAMETERS :: EnableAutoDepthStencil

When it is set to TRUE as in 3D it does weird things. I use 3D and 2D rhw simultaneously so I somehow need to change it, but it is not that simple, because it's used in CreateDevice. What should I do? Should I use two separate DirectX devices or is there some other way?

Never mind the previous post, that wasn't the problem.
The problem was, that I had to unset the texture, so the 2D elements used the colors of the previously set textures. Colors turned darker, because the texture's color was brown.
Problem solved!