Creating grayscale image of original picture
Converting an image to grayscale is really simple. You can create grayscale image by setting same value for Red, Green and Blue. It means RGB encoding supports 256 level of grays from (0,0,0), (1,1,1) throught (150,150,150) and finally (255,255,255). Tricky part to create grayscale image is to find replicated value or value level to form grayscale. For this we can find intensity of color by averaging color components. We all know there are three color components involved to form a color. (Red+Green+Blue)/3. Find the method below that produce fine results.
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// Create grayscale of original image public void grayscale() { // Get all pixel Pixel[] pixelArray = this.getPixels(); // Iterate through all pixel for (int index = 0; index < pixelArray.length; index++) { // computing intensity by averaging color components int intensity = (int) (pixelArray[index].getRed() + pixelArray[index].getGreen() + pixelArray[index].getBlue()) / 3; // create a new color Color color = new Color(intensity, intensity, intensity); // set new color pixelArray[index].setColor(color); } } |
Original image is on right and grayscale image is on left
There is another technique to compute grayscale that considers luminance perceived by human eye. Human normally considers blue darker then red even if same amount of light reflected off. Here we weight blue lower and red more when computing average.
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// Create grayscale of original image public void grayscaleWithLuminance() { // Get all pixel Pixel[] pixelArray = this.getPixels(); // Iterate through all pixel for (int index = 0; index < pixelArray.length; index++) { // computing intensity by averaging color components int luminance = (int) ((pixelArray[index].getRed()*0.299) + (pixelArray[index].getGreen()*0.587) + (pixelArray[index].getBlue()*0.114)); // create a new color Color color = new Color(luminance, luminance, luminance); // set new color pixelArray[index].setColor(color); } } |
Original image is on right and grayscale image is on left
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