Reading CR2 (Canon RAW) images into MATLAB

Hi,

I was wondering if anyone could help me to read in some CR2 images into MATLAB?

I have tried just using imread but it just reads the image as an 8 bit. I can used Adobe's DNG converter as people have suggested but would rather have the whole code automated. Other questions like this are a few years old so was hoping some people had new suggestions.

Thanks!

Answer 1

[Arvind Narayanan]

It is possible to read CR2 data into MATLAB with the normal workflow for reading images. You can try the following sample code snippet:

A=imread('sample.CR2');
imshow(A);
imwrite(A,'filename.jpg');

[Steffen B. Petersen]

The code below is essentially what Arvind proposes :

the red channel of the image displayed (an astronomical image with a few high intensity stars) is a correct representation of what MATLABN displayes - but clearly there is a problem with the lowest intensity levels of the image. It appears as if MATLAB is utilizing lossy compression schemes, which in apprearance looks like JPEG compression.

I would like to know how to swicth off the compression, if anybody knows.

[myfile,mypath]=uigetfile({'*.cr2'});

>> mygray2=myim(:,:,1);

>> mytiny2=mygray2(2000:2500,3300:3800);

>> figure(3);

>> imshow(mytiny2,[10 30]);