Help on reading/understanding these codes

Hi. can anyone explain to me the use of each function below? :) thank you:)

function [imgGray imgBinary] = Imageprocess(inputImg, T )

try

    imgInfo = imfinfo(inputImg); 
    colorType = imgInfo.ColorType; %to know the image type
    if strcmp (colorType,'truecolor') == 1  %colortype = 'truecolor'

      imgGray = rgb2gray(imread(inputImg));
      imgGray = imadjust(imgGray); 
      imgGray = adapthisteq(imgGray);
      figure,imshow(imgGray);
      thresh = graythresh(imgGray); 
      imgBinary = im2bw(imgGray, T);
      figure(2),imshow(imgBinary);
    end 
  catch

[Walter Roberson]

Which if the routines could you not find documented in the MATLAB help?

[Walter Roberson]

Please read the guide to tags and retag this question; see http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags