/// <summary>
        /// Gets a bitmap with the RGB histograms
        /// </summary>
        /// <returns>Three histograms for R, G and B values in the Histogram</returns>
        public Bitmap Visualize()
        {
            int oneColorHeight = 100;
            int margin         = 10;

            float[]  maxValues = new float[] { Red.Max(), Green.Max(), Blue.Max() };
            byte[][] values    = new byte[][] { Red, Green, Blue };


            Bitmap   histogramBitmap = new Bitmap(276, oneColorHeight * 3 + margin * 4);
            Graphics g = Graphics.FromImage(histogramBitmap);

            g.FillRectangle(Brushes.White, 0, 0, histogramBitmap.Width, histogramBitmap.Height);
            int yOffset = margin + oneColorHeight;

            for (int i = 0; i < 256; i++)
            {
                for (int color = 0; color < 3; color++)
                {
                    g.DrawLine(p[color], margin + i, yOffset * (color + 1), margin + i, yOffset * (color + 1) - (values[color][i] / maxValues[color]) * oneColorHeight);
                }
            }

            for (int i = 0; i < 3; i++)
            {
                g.DrawString(p[i].Color.ToKnownColor() + ", max value: " + maxValues[i], SystemFonts.SmallCaptionFont, Brushes.Silver, margin + 11, yOffset * i + margin + margin + 1);
                g.DrawString(p[i].Color.ToKnownColor() + ", max value: " + maxValues[i], SystemFonts.SmallCaptionFont, Brushes.Black, margin + 10, yOffset * i + margin + margin);
                g.DrawRectangle(p[i], margin, yOffset * i + margin, 256, oneColorHeight);
            }
            g.Dispose();

            return(histogramBitmap);
        }
コード例 #2
0
        /// <summary>
        /// Gets a bitmap with the RGB histograms
        /// </summary>
        /// <returns>Three histograms for R, G and B values in the Histogram</returns>
        public Image <Rgba32> Visualize()
        {
            int oneColorHeight = 100;
            int margin         = 10;

            float[]  maxValues = new float[] { Red.Max(), Green.Max(), Blue.Max() };
            byte[][] values    = new byte[][] { Red, Green, Blue };


            Image <Rgba32> histogramBitmap = new Image <Rgba32>(276, oneColorHeight * 3 + margin * 4);
            ///Graphics g = Graphics.FromImage(histogramBitmap);
            var rect = new RectangleF(0, 0, histogramBitmap.Width, histogramBitmap.Height);

            histogramBitmap.Mutate(ctx => ctx.Fill(Rgba32.White, rect));
            int yOffset = margin + oneColorHeight;

            for (int i = 0; i < 256; i++)
            {
                for (int color = 0; color < 3; color++)
                {
                    PointF[] points =
                    {
                        new PointF(margin + i, yOffset * (color + 1)),
                        new PointF(margin + i, yOffset * (color + 1) - (values[color][i] / maxValues[color]) * oneColorHeight)
                    };
                    histogramBitmap.Mutate(ctx => ctx.DrawLines(p[color], points));
                }
            }

            for (int i = 0; i < 3; i++)
            {
                var point = new PointF(margin + 11, yOffset * i + margin + margin + 1);
                histogramBitmap.Mutate(ctx => ctx.DrawText(penNames[i] + ", max value: " + maxValues[i], smallCaptionFont, Rgba32.Silver, point));
                point = new PointF(margin + 10, yOffset * i + margin + margin);
                histogramBitmap.Mutate(ctx => ctx.DrawText(penNames[i] + ", max value: " + maxValues[i], smallCaptionFont, Rgba32.Black, point));
                rect = new RectangleF(margin, yOffset * i + margin, 256, oneColorHeight);
                histogramBitmap.Mutate(ctx => ctx.Draw(p[i], rect));
            }

            return(histogramBitmap);
        }