How to dim a picture in matlab

basically, I need to create a function that scales the original range of 0-255 for the intensity to one that is between 0 and a new max value. The beginning function line is as follows:

function [dimmed] = dimImage(orig, new_max)

The next two lines are also given:

orig = imread('cupcakes.png');
orig = double(orig);

Answer 1

[Walter Roberson]

Divide by 255. Multiply by the maximum.

Answer 2

[DGM]

See the answer to the same question here:

https://www.mathworks.com/matlabcentral/answers/159435-dimming-an-image-with-a-new-max#answer_1118147