How do I create image from rgba?

Question

I get RGBA rgba from ColorDialog. How do I create image from rgba?

I want to set button's image based on user color selection.

Answer 1

You could create a Bitmap, create a Graphics object from it and fill it with any color.

Bitmap^ bmp = gcnew Bitmap(WIDTH, HEIGHT);
Graphics^ g = Graphics::FromImage(bmp);
g->FillRectangle(
   gcnew SolidBrush(Color::FromArgb(alfa, red, green, blue)),
   Rectangle(Point.Empty, bmp.Size() );

So easy.