imread() wrong gray values

When I tried to imread an simple gray scale image I drew in paint.net, the gray scale of the image data was totally off -- the background changed from origianl white (255) to some random gray value (55).

[Image Analyst]

Unfortunately you forgot to attach your image with the paper clip icon. I'll check back tomorrow.

Answer 1

[Walter Roberson]

The image file is not RGB, it is an colormapped image.

[img,cmap] = imread('image.png');
RGB = ind2rgb(img,cmap);
imshow(RGB)