private static void SaveImageAsPNGStream(Image img, Stream stream, PNGBitDepth bitDepth)
{
if (bitDepth == PNGBitDepth.Automatic)
{
if (ImageHelpers.IsImageTransparent((Bitmap)img))
{
bitDepth = PNGBitDepth.Bit32;
}
else
{
bitDepth = PNGBitDepth.Bit24;
}
}
if (bitDepth == PNGBitDepth.Bit32)
{
if (img.PixelFormat != PixelFormat.Format32bppArgb && img.PixelFormat != PixelFormat.Format32bppRgb)
{
using (Bitmap bmpNew = ((Bitmap)img).Clone(new Rectangle(0, 0, img.Width, img.Height), PixelFormat.Format32bppArgb))
{
bmpNew.Save(stream, ImageFormat.Png);
return;
}
}
}
else if (bitDepth == PNGBitDepth.Bit24)
{
if (img.PixelFormat != PixelFormat.Format24bppRgb)
{
using (Bitmap bmpNew = ((Bitmap)img).Clone(new Rectangle(0, 0, img.Width, img.Height), PixelFormat.Format24bppRgb))
{
bmpNew.Save(stream, ImageFormat.Png);
return;
}
}
}
img.Save(stream, ImageFormat.Png);
}
public static MemoryStream SaveImageAsStream(Image img, EImageFormat imageFormat, PNGBitDepth pngBitDepth = PNGBitDepth.Automatic,
int jpegQuality = 90, GIFQuality gifQuality = GIFQuality.Default)
{
MemoryStream stream = new MemoryStream();
switch (imageFormat)
{
case EImageFormat.PNG:
SaveImageAsPNGStream(img, stream, pngBitDepth);
if (Option.Settings.PNGStripColorSpaceInformation)
{
using (stream)
{
return(PNGStripColorSpaceInformation(stream));
}
}
break;
case EImageFormat.JPEG:
SaveImageAsJPEGStream(img, stream, jpegQuality);
break;
case EImageFormat.GIF:
img.SaveGIF(stream, gifQuality);
break;
case EImageFormat.BMP:
img.Save(stream, ImageFormat.Bmp);
break;
case EImageFormat.TIFF:
img.Save(stream, ImageFormat.Tiff);
break;
}
return(stream);
}
