ShowLoClippingTiff.cs
- //
- // This code is part of Document Solutions for Imaging demos.
- // Copyright (c) MESCIUS inc. All rights reserved.
- //
- using System;
- using System.IO;
- using System.Drawing;
- using System.Collections.Generic;
- using System.Linq;
- using System.Numerics;
- using GrapeCity.Documents.Drawing;
- using GrapeCity.Documents.Text;
- using GrapeCity.Documents.Imaging;
-
- namespace DsImagingWeb.Demos
- {
- // This sample demonstrates how to find and show pixels with clipped shadows.
- // This sample is identical to ShowLoClippingJpeg but uses a TIFF image
- // rather than a JPEG created from the same source photo.
- public class ShowLoClippingTiff
- {
- public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)
- {
- var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);
- using (var bmpSrc = new GcBitmap(Path.Combine("Resources", "ImagesBis", "clivia.tiff")))
- {
- // BitBlt requires the opacity of both images to be the same:
- bmpSrc.Opaque = opaque;
- // Render source image onto the target bitmap
- // (generally we might want to resize the source image first,
- // but in this case we just know that the source image has
- // the same size as the target, so skip this step):
- bmp.BitBlt(bmpSrc, 0, 0);
-
- using (var g = bmp.CreateGraphics())
- {
- for (int i = 0; i < bmp.PixelWidth; ++i)
- for (int j = 0; j < bmp.PixelHeight; ++j)
- {
- // If all of the colors are 0x00, we change the pixel's color to magenta:
- if ((bmp[i, j] & 0x00FFFFFF) == 0)
- bmp[i, j] = 0xFFFF00FF;
- }
- // Draw the original image in the bottom right corner for reference:
- var rc = new RectangleF(0, 0, pixelSize.Width / 4, pixelSize.Height / 4);
- g.DrawImage(bmpSrc, rc, null, ImageAlign.StretchImage);
- g.DrawRectangle(rc, Color.LightGray);
- }
- }
- return bmp;
- }
- }
- }
-