How to make contourf image semitransparent?

I am using contourf to plot a 2D image in jet like below. Now I plan to make it semitransparent, therefore I may add some more lines. I tried all solutions searched online. Seems not working. Would anyone help me out?

Answer 1

[Bhanu Prakash]

Hi,

Starting in R2022b, to control the transparency of a 'contourf' plot, you can use the 'FaceAlpha' property in MATLAB. Here is an sample code for the same:

Z = peaks;
[M,c] = contourf(Z);

The range of 'FaceAlpha' is [0,1] with the deafult value being '1':

>> c.FaceAlpha
ans =
1

If you want to reduce the transparency, you can decrease the value of 'FaceAlpha' as follows:

c.FaceAlpha=0.3

Hope this helps!

[DGM]

IIRC, this functionality requires R2022b or newer. While it's probably the appropriate answer today, older versions require different approaches.

[Adam Danz]

Thanks @Bhanu Prakash & @DGM, I added the release info to the answer.

[DGM]

Thanks Adam. Idk what happened there, but this is a good outcome.