hdrwrite with grayscale HDR image

Question

gbos 2019-9-27

回答： Mahesh Taparia 2019-10-1

Good evening everyone,

I have an HDR image to save, but it's just a grayscale image. "hdrwrite" wants in input a 3D matrix, so right now I'm doing like this:

hdr(:,:,1) = imgHDR;
hdr(:,:,2) = imgHDR;
hdr(:,:,3) = imgHDR;
hdrwrite(hdr,'result.hdr');

It's working correctly but I feel like it's a waste of space. Why do I need to save 3 equals channel if it's just a grayscale image?

How can I save a grayscale radiance map (.hdr) and save some storage space?

Thank you for you help

Answer 1

Mahesh Taparia 2019-10-1

Hi,

You can save storage space by storing the zeros in the other two dimensions in order to save memory. As per your code, you can use the below code:

Hdr=zeros(size(imgHDR,1),size(imgHDR,2),3); 
Hdr(:,:,1)=imgHDR; 
hdrwrite(Hdr,'result.hdr'); 

Hope it will help.