imread

imread/imread_examples.cpp

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+/**
+ * OpenCV SimpleBlobDetector Example
+ *
+ * Copyright 2015 by Satya Mallick <spmallick@gmail.com>
+ *
+ */
+
+#include "opencv2/opencv.hpp"
+
+using namespace cv;
+using namespace std;
+
+string type2str(int type) {
+    string r;
+
+    uchar depth = type & CV_MAT_DEPTH_MASK;
+
+    switch ( depth ) {
+        case CV_8U:  r = "8U"; break;
+        case CV_8S:  r = "8S"; break;
+        case CV_16U: r = "16U"; break;
+        case CV_16S: r = "16S"; break;
+        case CV_32S: r = "32S"; break;
+        case CV_32F: r = "32F"; break;
+        case CV_64F: r = "64F"; break;
+        default:     r = "User"; break;
+    }
+
+    return r;
+}
+
+
+int main( int argc, char** argv )
+{
+    // Read 8-bit grayscale image
+    Mat im = imread("earth-16-bit-per-channel.png", IMREAD_GRAYSCALE);
+    cout << "flags : IMREAD_GRAYSCALE" << endl;
+    cout << "Number of Channels : " << im.channels() << ", depth : " << type2str(im.depth()) << endl << endl;
+
+    // Read 8-bit color image
+    im =  imread("earth-16-bit-per-channel.png", IMREAD_COLOR);
+    cout <<  "flags : IMREAD_COLOR" << endl;
+    cout << "Number of Channels : " << im.channels() << ", depth : " << type2str(im.depth()) << endl << endl;
+
+    // Read 16-bit color image
+    im = imread("earth-16-bit-per-channel.png", IMREAD_ANYCOLOR | IMREAD_ANYDEPTH );
+    cout <<  "flags :  IMREAD_ANYCOLOR | IMREAD_ANYDEPTH" << endl;
+    cout << "Number of Channels : " << im.channels() << ", depth : " << type2str(im.depth()) << endl << endl;
+
+    // Read transparent PNG / TIFF image
+    im = imread("earth-16-bit-per-channel.png", IMREAD_UNCHANGED);
+    cout << "flags : IMREAD_UNCHANGED" << endl;
+    cout << "Number of Channels : " << im.channels() << ", depth : " << type2str(im.depth()) << endl << endl;
+}

imread/imread_examples.py

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+#!/usr/bin/python
+import cv2
+
+# Read 8-bit grayscale image
+im = cv2.imread("earth-16-bit-per-channel.png", cv2.IMREAD_GRAYSCALE)
+print "flags :  cv2.IMREAD_GRAYSCALE"
+print "Size %s, type %s\n" % (im.shape,im.dtype)
+
+# Read 8-bit color image
+im = cv2.imread("earth-16-bit-per-channel.png", cv2.IMREAD_COLOR)
+print "flags : cv2.IMREAD_COLOR"
+print "Size %s, type %s\n" % (im.shape,im.dtype)
+
+# Read 16-bit color image
+im = cv2.imread("earth-16-bit-per-channel.png", cv2.IMREAD_ANYCOLOR | cv2.IMREAD_ANYDEPTH )
+print "flags :  cv2.IMREAD_ANYCOLOR | cv2.IMREAD_ANYDEPTH"
+print "Size %s, type %s\n" % (im.shape,im.dtype)
+
+# Read transparent PNG / TIFF image
+im = cv2.imread("earth-16-bit-per-channel.png", cv2.IMREAD_UNCHANGED)
+print "flags : cv2.IMREAD_UNCHANGED"
+print "Size %s, type %s\n" % (im.shape,im.dtype)