How to convert 8 bit IplImage to 24 bit IplImage in OpenCV?

Question

I have an 8 bit IplImage and I want to convert it to a 24 bit IplImage. How can I do this?

I just would like to reccomend you to use C++ API, and use cv::Mat data types. Easier allways. — Ander Biguri, May 22 '13 at 13:00
8bit grayscale to 24bit RGB (3x8) or 8bit grayscale to 24bit grayscale(1x24)? — LovaBill, May 22 '13 at 14:05

score 3 · Accepted Answer · answered May 22 '13 at 12:47

3

Assuming your gray image is in a variable called image -

IplImage *rgbimage = cvCreateImage(/*whatever size*/, 8, 3);
cvCvtColor(image, rgbimage, CV_GRAY2BGR);

answered May 22 '13 at 12:47

Roger Rowland

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Rachel Gallen · Answer 2 · 2018-12-29T03:17:58.667

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You need cvConvertScale this is an example from this question

    IplImage *im8 = cvLoadImage(argv[1]);
    IplImage *im32 = cvCreateImage(cvSize(im8->width, im8->height), 32, 3);

    cvConvertScale(im8, im32, 1/255.);

edited Dec 29 '18 at 03:17

answered May 22 '13 at 12:55

Rachel Gallen

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score 2 · Answer 3 · answered May 22 '13 at 12:47

2

Here you go,

Mat input_8Bit;
vector <Mat> Vec_temp_8bit;

Vec_temp_8bit.push_back ( input_8Bit );
Vec_temp_8bit.push_back ( input_8Bit );
Vec_temp_8bit.push_back ( input_8Bit );

Mat Output_24Bit;

merge ( Vec_temp_8bit, Output_24Bit );

Please give a try, I havent checked it. But logically it should work!

answered May 22 '13 at 12:47

2vision2

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The cvtColor (http://docs.opencv.org/modules/imgproc/doc/miscellaneous_transformations.html#cvtcolor) function does exactly what you described, in one line. – mpenkov May 23 '13 at 05:43

How to convert 8 bit IplImage to 24 bit IplImage in OpenCV?

3 Answers3