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ae7b1ad056
processing-js 0.4 has been merged in some relevant parts basic and topic scripts added for test color handling fixed, more scripts show up now
34 lines
1.4 KiB
Plaintext
34 lines
1.4 KiB
Plaintext
float[][] kernel = { { -1, -1, -1 },
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{ -1, 9, -1 },
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{ -1, -1, -1 } };
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size(200, 200);
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PImage img = loadImage("data/house.jpg", null, function(){ // Load the original image
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image(img, 0, 0); // Displays the image from point (0,0)
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img.loadPixels();
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// Create an opaque image of the same size as the original
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PImage edgeImg = createImage(img.width, img.height, RGB);
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// Loop through every pixel in the image.
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for (int y = 1; y < img.height-1; y++) { // Skip top and bottom edges
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for (int x = 1; x < img.width-1; x++) { // Skip left and right edges
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float sum = 0; // Kernel sum for this pixel
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for (int ky = -1; ky <= 1; ky++) {
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for (int kx = -1; kx <= 1; kx++) {
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// Calculate the adjacent pixel for this kernel point
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int pos = (y + ky)*width + (x + kx);
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// Image is grayscale, red/green/blue are identical
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float val = red(img.pixels[pos]);
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// Multiply adjacent pixels based on the kernel values
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sum += kernel[ky+1][kx+1] * val;
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}
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}
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// For this pixel in the new image, set the gray value
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// based on the sum from the kernel
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edgeImg.pixels[y*img.width + x] = color(sum);
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}
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}
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// State that there are changes to edgeImg.pixels[]
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edgeImg.updatePixels();
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image(edgeImg, 100, 0); // Draw the new image
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});
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