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karlphillipkarlphillip
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qtSmoothColorTransition: cosmetic changes.
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‎README.md

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@@ -44,3 +44,7 @@ qtKinectVideo
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--------------
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An application based on "Color Basics" from Kinect for Windows SDK 1.8.
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This demo shows how to display the Color Stream on your Qt application.
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qtSmoothColorTransition
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--------------
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A demo that takes a grayscale image as input and performs a smooth color transition from a color palette using linear interpolation.

‎qtSmoothColorTransition/main.cpp

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@@ -3,19 +3,26 @@
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#include <QImage>
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#include <QLabel>
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// http://stackoverflow.com/a/25878225/176769
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// http://mycodelog.com/2010/05/16/interpolation/
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#if 0
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QImage smooth_color_transition(const QImage& input, const QVector<QColor>& color_vec)
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/*
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* ColorMaps:
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* http://jdherman.github.io/colormap/
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* http://www.mathworks.com/matlabcentral/mlc-downloads/downloads/submissions/35242/versions/2/screenshot.jpg
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* http://www.r-bloggers.com/gmt-standard-color-palettes/
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*
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* Linear interpolation:
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* http://stackoverflow.com/a/25878225/176769
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* http://mycodelog.com/2010/05/16/interpolation/
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*/
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// Artificial colorization of an image based in 2 starting colors
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QImage smooth_color_transition(const QImage& input, const QColor color_src, const QColor color_dst)
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{
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QImage output(input.size(), input.format());
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QColor color_src = color_vec.at(0);
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unsigned int r1 = color_src.red();
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unsigned int g1 = color_src.green();
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unsigned int b1 = color_src.blue();
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QColor color_dst = color_vec.at(1);
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unsigned int r2 = color_dst.red();
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unsigned int g2 = color_dst.green();
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unsigned int b2 = color_dst.blue();
@@ -38,21 +45,20 @@ QImage smooth_color_transition(const QImage& input, const QVector<QColor>& color
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return output;
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}
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#endif
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// Artificial colorization of an image based on color palette (vector)
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QImage smooth_color_transition(const QImage& input, const QVector<QColor>& color_vec)
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{
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if (color_vec.size() < 2)
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return QImage();
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QImage output(input.size(), input.format());
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QImage output(input.size(), QImage::Format_RGB888);
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int num_colors = color_vec.size();
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std::cout << "Num colors:" << color_vec.size() << std::endl;
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//std::cout << "Num colors:" << color_vec.size() << std::endl;
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int color_width = 256 / (color_vec.size()-1);
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std::cout << "Color width:" << color_width << std::endl;
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//std::cout << "Color width:" << color_width << std::endl;
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QVector<QColor> pallete;
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for (int c = 1; c < num_colors; c++)
@@ -72,10 +78,9 @@ QImage smooth_color_transition(const QImage& input, const QVector<QColor>& color
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float p = i / (float)color_width; // percentage
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//Resultant Color = RGB(A*(1-P)+X*P, B*(1-P)+Y*P, C*(1-P)+Z*P)
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int r = (int) r1 * (1-p) + r2 * p;
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int g = (int) g1 * (1-p) + g2 * p;
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int b = (int) b1 * (1-p) + b2 * p;
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int b = (int) b1 * (1-p) + b2 * p;
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pallete.push_back(qRgb(r, g, b));
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}
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}
@@ -84,7 +89,7 @@ QImage smooth_color_transition(const QImage& input, const QVector<QColor>& color
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for (int i = pallete.size(); i < 256; i++)
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pallete.push_back(color_vec[color_vec.size()-1].rgb());
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std::cout << "Pallete size:" << pallete.size() << std::endl;
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//std::cout << "Pallete size:" << pallete.size() << std::endl;
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for (int x = 0; x < input.width(); x++)
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{
@@ -106,37 +111,131 @@ int main(int argc, char* argv[])
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QImage input("/Users/karlphillip/workspace/GraphicsProgramming/qtSmoothColorTransition/heightmap.jpg");
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if (input.isNull())
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{
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std::cout << "!!! Unable to load image" << std::endl;
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return -1;
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}
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QLabel input_label;
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input_label.setPixmap(QPixmap::fromImage(input));
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input_label.resize(input.width(), input.height());
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input_label.show();
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QVector<QColor> colors;
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colors.push_back(QColor(0, 120, 200)); // dark blue
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colors.push_back(QColor(120, 220, 255)); // cyan
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colors.push_back(QColor(71, 141, 104)); // dark green
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colors.push_back(QColor(106, 168, 107)); // medium green
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colors.push_back(QColor(141, 173, 132)); // light green
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colors.push_back(QColor(166, 191, 151)); // super light green
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colors.push_back(QColor(217, 233, 188)); // sand yellow
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colors.push_back(QColor(185, 140, 90)); // light orange
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colors.push_back(QColor(162, 90, 34)); // light red
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colors.push_back(QColor(144, 61, 45)); // dark red
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colors.push_back(QColor(151, 68, 64)); // super dark red
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colors.push_back(QColor(156, 146, 170)); // purple-red
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colors.push_back(QColor(170, 170, 210)); // purple-white
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colors.push_back(QColor(240, 247, 243)); // white
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// Terrain
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colors.push_back(QColor(1, 1, 48)); // dark blue
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colors.push_back(QColor(29, 24, 245)); // blue
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colors.push_back(QColor(0, 255, 254)); // cyan
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colors.push_back(QColor(0, 100, 56)); // dark green
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colors.push_back(QColor(0, 127, 63)); // green-1
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colors.push_back(QColor(3, 153, 72)); // green-2
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colors.push_back(QColor(54, 178, 86)); // green-3
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colors.push_back(QColor(116, 204, 119)); // light green
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colors.push_back(QColor(173, 229, 161)); // light green-2
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colors.push_back(QColor(227, 255, 209)); // sand
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colors.push_back(QColor(186, 192, 107)); // dark sand
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colors.push_back(QColor(184, 90, 35)); // dark orange
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colors.push_back(QColor(105, 42, 0)); // dark red
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//colors.push_back(QColor(245, 245, 250)); // snow
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/*
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// jet
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colors.push_back(QColor(0, 0, 191));
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colors.push_back(QColor(0, 0, 255));
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colors.push_back(QColor(0, 64, 255));
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colors.push_back(QColor(0, 128, 255));
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colors.push_back(QColor(0, 191, 255));
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colors.push_back(QColor(0, 255, 255));
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colors.push_back(QColor(64, 255, 191));
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colors.push_back(QColor(128, 255, 128));
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colors.push_back(QColor(64, 255, 191));
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colors.push_back(QColor(191, 255, 64));
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colors.push_back(QColor(255, 255, 0));
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colors.push_back(QColor(255, 191, 0));
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colors.push_back(QColor(255, 191, 0));
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colors.push_back(QColor(255, 128, 0));
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colors.push_back(QColor(255, 64, 0));
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colors.push_back(QColor(255, 0, 0));
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colors.push_back(QColor(191, 0, 0));
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colors.push_back(QColor(128, 64, 0));
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*/
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/*
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// BGR
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colors.push_back(QColor(0, 0, 255));
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colors.push_back(QColor(0, 255, 0));
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colors.push_back(QColor(255, 0, 0));
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*/
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/*
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// hot
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colors.push_back(QColor(43, 0, 0));
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colors.push_back(QColor(85, 0, 0));
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colors.push_back(QColor(128, 0, 0));
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colors.push_back(QColor(170, 0, 0));
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colors.push_back(QColor(213, 0, 0));
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colors.push_back(QColor(255, 0, 0));
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colors.push_back(QColor(255, 43, 0));
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colors.push_back(QColor(255, 85, 0));
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colors.push_back(QColor(255, 128, 0));
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colors.push_back(QColor(255, 170, 0));
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colors.push_back(QColor(255, 213, 0));
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colors.push_back(QColor(255, 255, 0));
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colors.push_back(QColor(255, 255, 64));
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colors.push_back(QColor(255, 255, 128));
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colors.push_back(QColor(255, 255, 191));
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colors.push_back(QColor(255, 255, 255));
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*/
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/*
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// cool
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colors.push_back(QColor(0, 255, 255));
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colors.push_back(QColor(17, 238, 255));
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colors.push_back(QColor(34, 221, 255));
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colors.push_back(QColor(51, 204, 255));
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colors.push_back(QColor(68, 187, 255));
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colors.push_back(QColor(85, 170, 255));
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colors.push_back(QColor(102, 153, 255));
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colors.push_back(QColor(68, 187, 255));
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colors.push_back(QColor(85, 170, 255));
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colors.push_back(QColor(102, 153, 255));
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colors.push_back(QColor(119, 136, 255));
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colors.push_back(QColor(136, 119, 255));
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colors.push_back(QColor(153, 102, 255));
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colors.push_back(QColor(170, 85, 255));
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colors.push_back(QColor(187, 68, 255));
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colors.push_back(QColor(204, 51, 255));
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colors.push_back(QColor(221, 34, 255));
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colors.push_back(QColor(238, 17, 255));
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colors.push_back(QColor(255, 0, 255));
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*/
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/*
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// water temperature
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colors.push_back(QColor(41, 10, 216));
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colors.push_back(QColor(38, 77, 255));
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colors.push_back(QColor(63, 160, 255));
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colors.push_back(QColor(114, 217, 255));
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colors.push_back(QColor(140, 247, 255));
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colors.push_back(QColor(224, 255, 255));
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colors.push_back(QColor(255, 255, 191));
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colors.push_back(QColor(255, 224, 153));
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colors.push_back(QColor(255, 255, 191));
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colors.push_back(QColor(255, 173, 114));
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colors.push_back(QColor(247, 109, 94));
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colors.push_back(QColor(216, 38, 50));
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colors.push_back(QColor(164, 0, 33));
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*/
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// Build colored elevation map
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QImage output = smooth_color_transition(input, colors);
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output.save("/Users/karlphillip/workspace/GraphicsProgramming/qtSmoothColorTransition/output.jpg");
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QLabel output_label;
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output_label.setPixmap(QPixmap::fromImage(output));
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output_label.resize(output.width(), output.height());
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output_label.show();
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139-
output.save("colored.jpg");
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return app.exec();
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}

‎qtSmoothColorTransition/output.jpg

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