Bitmap image wrongly inverted

Hi all,

I am reading a black and white bitmap (.bmp) image using

imread('filepath');

However, for this certain image the picture comes through as the complement of itself. i.e. the colours/intensities are inverted. I have tried using

imread('filepath', 'bmp');

as well.

Any ideas? I have attached the image in question, along with the output that is given.

Thanks

Answer 1

[Thorsten]

[I, map] = imread('../../Downloads/scene_l.bmp');
imshow(I, map)

J = ind2rgb(I, map); % convert to non-indexed image
imshow(J)

Answer 2

[Image Analyst]

Subtract it from 255:

grayImage = uint8(255) - invertedGrayImage;