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I do have one more question though... I loaded a greyscale image but it showed 3 channels. Why would a greyscale image need 3 channels ? I know this isnt connected to opencv... just curious.

Thanks. I got it now. I was just checking it against the properties window and it showed 'Bit Depth 32'. Now I get it that it meant 32 bits alltogether for all channels.

Sorry I meant CV_32S.... that would be a 4. I just wanted to read the depth so I code use it later in my code maybe.

Hi,

I am a newbie with opencv. I am using opencv3.1. I was reading the depth and channles of images but it returns weird values.

Here is my code:

string filepath = "C:/Users/studentlab/Desktop/koora/opencv-logo.png";
cv::Mat image_1= cv::imread(filepath.data(),CV_LOAD_IMAGE_UNCHANGED);
int DEPTH = image_1.depth();
int CHANNELS=image_1.channels();

The depth should be 4(CV_32U) but it reads 0(CV_8U). And the channels reads 4 for every image(i tried checking it for a greyscale image too). Can someone point out my mistake ?

I am using Qt Creator on Windows(64 bit) with MinGW(32 bit).

Actually it did help. But I get other warnings now.

c:\mingw\include\strsafe.h:987:10: error: 'dwFlags' was not declared in this scope

I have the same problem. adding your(chinadragon) piece of code did not help. Any other suggestions ?