I see what you are thinking of - x-axis one set of colors and y-axis one set of colors, but then what about along the line at a 45 degree angle? How would the color of a point on that line be determined? With an orthoradial gradient between the corresponding stop points of the x and y axis... One e...

One linear gradient is ok, using the editor I could obtain whatever gradient I tried... Here, I would like to have different gradients depending from direction. If you go from top to bottom, color should change, with the same hue and saturation (like in a "straight rainbow"), from left to ...

I would like to have a gradient changing smoothly the color in the x direction and the saturation y direction, in order to have a nice, highly saturated spectrum on the left part and something almost uniformely gray on the right. I tried to edit a circular gradient, but when I add and modify a stop ...