Merge pull request #3902 from apavlenko:doc_fix_imwrite_master
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commit
085b4ca741
@ -185,13 +185,14 @@ compression parameters :
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void createAlphaMat(Mat &mat)
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{
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CV_Assert(mat.channels() == 4);
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for (int i = 0; i < mat.rows; ++i) {
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for (int j = 0; j < mat.cols; ++j) {
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Vec4b& rgba = mat.at<Vec4b>(i, j);
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rgba[0] = UCHAR_MAX;
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rgba[1] = saturate_cast<uchar>((float (mat.cols - j)) / ((float)mat.cols) * UCHAR_MAX);
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rgba[2] = saturate_cast<uchar>((float (mat.rows - i)) / ((float)mat.rows) * UCHAR_MAX);
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rgba[3] = saturate_cast<uchar>(0.5 * (rgba[1] + rgba[2]));
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Vec4b& bgra = mat.at<Vec4b>(i, j);
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bgra[0] = UCHAR_MAX; // Blue
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bgra[1] = saturate_cast<uchar>((float (mat.cols - j)) / ((float)mat.cols) * UCHAR_MAX); // Green
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bgra[2] = saturate_cast<uchar>((float (mat.rows - i)) / ((float)mat.rows) * UCHAR_MAX); // Red
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bgra[3] = saturate_cast<uchar>(0.5 * (bgra[1] + bgra[2])); // Alpha
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}
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}
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}
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