Select rgb bands from hyperspectral images

I have a geotiff image with 48 bands and I want to select only red, green and blue bands. How can I do?

I have attached the info I get with imfinfo, thanks.

Answer 1

[Rajani Mishra]

You can extract R,G,B bands from hyperspectral image by extracting bands present in the wavelength range of Red, Green, Blue. For this along with the image (GeoTIFF file) metadata of wavelength range present and spectral resolution (difference between two wavelength bands) is also required.

Say, after reading the image file data is in a cube form of size M*N*K where M is the height, N is the width and K is the range of wavelength bands present. You can get R, G, B bands by

DataCube(:,:,range) where range is the desired wavelength range. 

Now, for GeoTIFF images before downloading the image have a look at the wavelength information of the Sensors this may help you with the metadata required.

[valerio riso]

Ok, so without metadata is impossible to recover rgb bands, right? The problem is that I am doing a project in which I have to binarize this image first (it's a project of object detection), and I have only the image without any other specifics. Is there a way to binarize correctly the original image with 48 bands? Or I have to recover necessarily the rgb bands? Thanks.