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| void convertirImagenABlancoYNegro(Image imagen) { | |
| var anchura = imagen.width; | |
| var altura = imagen.height; | |
| var umbralParaBlancoYNegro = 128; | |
| for (var y = 0; y < altura; y++) { | |
| for (var x = 0; x < anchura; x++) { | |
| int r = getRed(imagen.getPixelSafe(x, y)); | |
| int g = getGreen(imagen.getPixelSafe(x, y)); | |
| int b = getBlue(imagen.getPixelSafe(x, y)); | |
| int a = getAlpha(imagen.getPixelSafe(x, y)); | |
| var gris = 0.3 * r + 0.59 * g + 0.11 * b; | |
| if (gris > umbralParaBlancoYNegro) { | |
| imagen.setPixelRgba(x, y, 255, 255, 255); // Blanco | |
| } else { | |
| // Nota: el alpha, entre más bajo, más transparente. O sea, alpha 0 es totalmente transparente, alpha 255 es opaco | |
| if (a < umbralParaBlancoYNegro) { | |
| imagen.setPixelRgba(x, y, 255, 255, 255); // Blanco | |
| //imagen.setPixelRgba(x, y, 0, 0, 0); // Negro | |
| } else { | |
| imagen.setPixelRgba(x, y, 0, 0, 0); // Negro | |
| } | |
| } | |
| } | |
| } | |
| File("blanco_y_negro.png").writeAsBytesSync(encodePng(imagen)); | |
| } |
int r = getRed(imagen.getPixelSafe(x, y)); int g = getGreen(imagen.getPixelSafe(x, y)); int b = getBlue(imagen.getPixelSafe(x, y)); int a = getAlpha(imagen.getPixelSafe(x, y)); que son los metodos getRed getRed....
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int r = getRed(imagen.getPixelSafe(x, y));
int g = getGreen(imagen.getPixelSafe(x, y));
int b = getBlue(imagen.getPixelSafe(x, y));
int a = getAlpha(imagen.getPixelSafe(x, y));
que son los metodos getRed getRed....