/// <summary>
/// Image preparing process. Resizing and fixing quality.
/// </summary>
/// <param name="originalImage">Original image</param>
/// <param name="preComplementWidth">Width used when resizing</param>
/// <returns>Grayscaled image for descewing</returns>
private static KrecImage PrepareImageForDeskewing(KrecImage originalImage, out int preComplementWidth)
{
if (originalImage.HorizontalResolution > maxDpi)
{
// TODO: make k be integer to avoid resampling errors
double k = maxDpi / originalImage.HorizontalResolution;
originalImage = ImageSizesModifier.CompressImageToNewSizes(originalImage, (int)Math.Round(originalImage.Width * k),
(int)Math.Round(originalImage.Height * k));
}
KrecImage projectionImage;
preComplementWidth = Math.Min(projectionSideWidth, originalImage.Width);
if (originalImage.Height < maxCompletedSideWith && originalImage.Width < maxCompletedSideWith) //имитирует поведение прошлого сжимателя
{
int dx = (maxCompletedSideWith - originalImage.Width) / 2;
int dy = (maxCompletedSideWith - originalImage.Height) / 2;
int newWidth = projectionSideWidth - dx;
int newHeight = projectionSideWidth - dy;
double k = Math.Max((double)originalImage.Height / newHeight, (double)originalImage.Width / newWidth);
var compressedImage = ImageSizesModifier.CompressImageToNewSizes(originalImage,
(int)(originalImage.Width / k), (int)(originalImage.Height / k));
compressedImage = BitmapProcessor.AlignImageBackround(compressedImage);
preComplementWidth = (int)(originalImage.Width / k);
projectionImage = ImageSizesModifier.GetImageWithPowerOf2Side(compressedImage, projectionSideWidth);
}
else
{
var alignedImage = BitmapProcessor.AlignImageBackround(originalImage);
projectionImage = ImageSizesModifier.GetImageWithPowerOf2Side(alignedImage, projectionSideWidth);
}
return(projectionImage);
}