private static bool SaveNonJpeg(Image imageToSave, ImageFormat imageFormat, Stream stream)
{
bool needsDispose = false;
// Removing transparency if it's not supported in the output
if (imageFormat != ImageFormat.Png && Image.IsAlphaPixelFormat(imageToSave.PixelFormat))
{
imageToSave = ImageOperator.Clone(imageToSave, PixelFormat.Format24bppRgb);
needsDispose = true;
}
try {
imageToSave.Save(stream, imageFormat);
return(true);
}
catch (Exception ex) {
log.Error("Failed to save image, " + ex.Message);
return(false);
}
finally {
if (needsDispose && imageToSave != null)
{
imageToSave.Dispose();
imageToSave = null;
}
}
}
private Bitmap CreateNegative(Image sourceImage)
{
Bitmap clone = ImageOperator.Clone(sourceImage) as Bitmap;
ColorMatrix invertMatrix = new ColorMatrix(new float[][] {
new float[] { -1, 0, 0, 0, 0 },
new float[] { 0, -1, 0, 0, 0 },
new float[] { 0, 0, -1, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 1, 1, 1, 1, 1 }
});
ImageOperator.ApplyColorMatrix(clone, invertMatrix);
return(clone);
}
private static bool SaveJpeg(Image imageToSave, ImageFormat imageFormat, int jpegQuality, Stream stream)
{
bool foundEncoder = false;
foreach (ImageCodecInfo imageCodec in ImageCodecInfo.GetImageEncoders())
{
if (imageCodec.FormatID != imageFormat.Guid)
{
continue;
}
foundEncoder = true;
try {
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(Encoder.Quality, jpegQuality);
// Removing transparency if it's not supported in the output
if (Image.IsAlphaPixelFormat(imageToSave.PixelFormat))
{
Image nonAlphaImage = ImageOperator.Clone(imageToSave, PixelFormat.Format24bppRgb);
nonAlphaImage.Save(stream, imageCodec, parameters);
nonAlphaImage.Dispose();
nonAlphaImage = null;
}
else
{
imageToSave.Save(stream, imageCodec, parameters);
}
return(true);
}
catch (Exception ex) {
log.Error("Failed to save jpeg, " + ex.Message);
}
}
if (!foundEncoder)
{
log.Error("No JPG encoder found.");
}
return(false);
}
