//The methods shows how to use FlexCelImgExport the "hard way", without using SaveAsImage.
//For normal operation you should only need to call SaveAsImage, but you could use the code here
//if you need to customize the ImgExport output, or if you need to get all the images as different files.
private void CreateImg(Stream OutStream, FlexCelImgExport ImgExport, ImageFormat ImgFormat, ImageColorDepth Colors, ref TImgExportInfo ExportInfo)
{
TPaperDimensions pd = ImgExport.GetRealPageSize();
PixelFormat RgbPixFormat = Colors != ImageColorDepth.TrueColor ? PixelFormat.Format32bppPArgb : PixelFormat.Format24bppRgb;
PixelFormat PixFormat = PixelFormat.Format1bppIndexed;
switch (Colors)
{
case ImageColorDepth.TrueColor: PixFormat = RgbPixFormat; break;
case ImageColorDepth.Color256: PixFormat = PixelFormat.Format8bppIndexed; break;
}
using (Bitmap OutImg = CreateBitmap(ImgExport.Resolution, pd, PixFormat))
{
Bitmap ActualOutImg = Colors != ImageColorDepth.TrueColor ? CreateBitmap(ImgExport.Resolution, pd, RgbPixFormat) : OutImg;
try
{
using (Graphics Gr = Graphics.FromImage(ActualOutImg))
{
Gr.FillRectangle(Brushes.White, 0, 0, ActualOutImg.Width, ActualOutImg.Height); //Clear the background
ImgExport.ExportNext(Gr, ref ExportInfo);
}
if (Colors == ImageColorDepth.BlackAndWhite)
{
FloydSteinbergDither.ConvertToBlackAndWhite(ActualOutImg, OutImg);
}
else
if (Colors == ImageColorDepth.Color256)
{
OctreeQuantizer.ConvertTo256Colors(ActualOutImg, OutImg);
}
}
finally
{
if (ActualOutImg != OutImg)
{
ActualOutImg.Dispose();
}
}
OutImg.Save(OutStream, ImgFormat);
}
}
