Color conversion RGB to Lab

Hello, I want to convert a RGB image to L*a*b*, I did some research and I found two different codes, and the results are also differents.

1st code :

                src = 'Img1.jpg';
                rgbI = imread(src);

                labI=rgb2lab(rgbI);
                imshow(labI(:,:,1),[0 100])

2nd code :

                src = 'shad.jpg';
                rgbI = imread(src);

                labTransform = makecform('srgb2lab');
                labI = applycform(rgbI, labTransform);

                imshow(labI)

Could you please tell me which one is the correct conversion.

[Stephen23]

Your source images are different:

 src = 'Img1.jpg';

 src = 'shad.jpg';

[med BT]

I work on the same image

Answer 1

[Stephen23]

The makecform default illuminant is ICC, but sRGB uses D65. So you need to specify the correct whitepoint for that conversion

 makecform('srgb2lab', 'AdaptedWhitePoint',  whitepoint('D65'))