@eightlines wrote:
I've been looking into the simpleColorKey example which turns purple pixels to black. In my case I'd like to turn white pixels to transparent (I'm using a B&W JPG with no grey tones). The end result doesn't work as expected, and I can see the color change, but no transparency. Am I missing something simple?
include "ofApp.h"
void ofApp::setup(){
ofEnableAlphaBlending();
ofBackground(0, 0, 255);keyed.setImageType(OF_IMAGE_COLOR_ALPHA); source.load("image1.jpg"); ofPixelsRef pixels = source.getPixels(); for (uint y = 0; y < source.getHeight(); y ++) { for (uint x = 0; x < source.getWidth(); x ++) { ofColor color = source.getColor(x, y); int threshold = 150; if (color.r > threshold && color.g > threshold && color.b > threshold) { pixels.setColor(x, y, ofColor(255, 0, 0, 0)); } } } keyed.setFromPixels(pixels);
}
void ofApp::draw(){
keyed.draw(0, 0);
}
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