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How to store negative float values in Mat object? [closed]

asked 2017-05-31 07:40:32 -0500

anomaly_ gravatar image

Why am I not able to do this?

Mat img = Mat(4,4, CV_32FC3);
img.at<Vec3b>(0,0)[0] = -1;
img.at<Vec3b>(0,1)[0] = -0.5;

When I display the Mat object, it shows 255 in place of -1. I want to have all of my pixel values in the range of -1 to 1. How can I achieve that?

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Closed for the following reason the question is answered, right answer was accepted by LBerger
close date 2017-05-31 07:49:40.375286

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answered 2017-05-31 07:43:07 -0500

LBerger gravatar image

updated 2017-05-31 07:43:45 -0500

it is not

   img.at<Vec3b>(0,0)[0] = -1;

but

   img.at<Vec3f>(0,0)[0] = -1;
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Ohh! Got it, Thanks a lot :)

anomaly_ gravatar imageanomaly_ ( 2017-05-31 07:48:36 -0500 )edit

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Asked: 2017-05-31 07:40:32 -0500

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Last updated: May 31 '17