Background value of scatter plot

In this plot, the bottom of colorbar is white to present as white color in background of scatter plot. Colors of scatter plot mean the point density. In this situation, I want to change the bottom of colorbar as blue (bottom of colormap 'jet') without changes of the background color (I mean white color maintaining.). Also, colorbar has to start from a zero. Thank you in advance.

[John BG]

it's easier to help if you make the code available. Please attach the lines that plot this graph. Awaiting answer

Answer 1

[Image Analyst]

The colorbar shows the colormap that is applied to the data. Since you changed the jet colormap to white so that your 0 data will be white, it will show up as white in the colorbar also. I don't think that playing around with caxis() will help. You could make up your own image and then show that instead of the colorbar if you want. Use repmat() and ind2rgb() to make up a colored ramp, then use imshow() to display it in an axes, then use the position property of the axes to place it beside your main image.

Or you can just make up an image instead of a scatterplot and display that, which is probably easier.