color quantization gives map of 55 ,instead of 64 colors?

my program is croping specific area from image and convert to lower color map

              rgb2ind(image, 64, 'nodither');

this works fine ,but with the image of 13x11x3 it gives 55 colormap?

1-is it normal?

2- my program further reshape the modified colormap on the assumption that colormap is 64 , but i got the error "To RESHAPE the number of elements must not change."

So what should i do now? can i not get 64 map on such small image? or it doenst depend on size?

Answer 1

[Image Analyst]

You may not have 64 unique colors. Maybe your image has only 55 unique colors in it. Attach your RGB image so we can check it.

[hassan mahmood]