/** * Analyzes image colors and creates color map. */ protected void AnalyzePixels() { int len = pixels.Length; int nPix = len / 3; indexedPixels = new byte[nPix]; NeuQuant nq = new NeuQuant(pixels, len, sample); // initialize quantizer colorTab = nq.Process(); // create reduced palette // convert map from BGR to RGB // for (int i = 0; i < colorTab.Length; i += 3) // { // byte temp = colorTab[i]; // colorTab[i] = colorTab[i + 2]; // colorTab[i + 2] = temp; // usedEntry[i / 3] = false; // } // map image pixels to new palette int k = 0; for (int i = 0; i < nPix; i++) { int index = nq.Map(pixels[k++] & 0xff, pixels[k++] & 0xff, pixels[k++] & 0xff); usedEntry[index] = true; indexedPixels[i] = (byte)index; } pixels = null; colorDepth = 8; palSize = 7; // get closest match to transparent color if specified if (transparent != Color.Empty) { transIndex = FindClosest(transparent); } }
/** * Analyzes image colors and creates color map. */ protected void AnalyzePixels() { int len = pixels.Length; int nPix = len / 3; indexedPixels = new byte[nPix]; NeuQuant nq = new NeuQuant(pixels, len, sample); // initialize quantizer colorTab = nq.Process(); // create reduced palette // convert map from BGR to RGB // for (int i = 0; i < colorTab.Length; i += 3) // { // byte temp = colorTab[i]; // colorTab[i] = colorTab[i + 2]; // colorTab[i + 2] = temp; // usedEntry[i / 3] = false; // } // map image pixels to new palette int k = 0; for (int i = 0; i < nPix; i++) { int index = nq.Map(pixels[k++] & 0xff, pixels[k++] & 0xff, pixels[k++] & 0xff); usedEntry[index] = true; indexedPixels[i] = (byte) index; } pixels = null; colorDepth = 8; palSize = 7; // get closest match to transparent color if specified if (transparent != Color.Empty ) { transIndex = FindClosest(transparent); } }