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So there is an issue after i convert PDF file to a TIF file. When i try to save the pdf to a high dpi tiff, small white lines get added to the rendered text. Above is the source PDF, below is the tiff result: https://www.dropbox.com/...issuedifference.png?dl=0here is some of the code i use for the conversion. (dpi is 300) Code:
var bitmap = new Bitmap(pixelsWidth, pixelsHeight);
bitmap.SetResolution(dpi, dpi);
using (var graphics = Graphics.FromImage(bitmap))
{
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
var rect = new Rectangle(0, 0, pixelsWidth, pixelsHeight);
graphics.FillRectangle(Brushes.White, rect);
page.Render(graphics, 0, 0, pixelsWidth, pixelsHeight,
Patagames.Pdf.Enums.PageRotate.Normal,
Patagames.Pdf.Enums.RenderFlags.FPDF_NO_CATCH | Patagames.Pdf.Enums.RenderFlags.FPDF_LCD_TEXT);
//check and create output folders
if (!Directory.Exists(jobFolder)) Directory.CreateDirectory(jobFolder);
string filePart = (i+1).ToString("D3");
var path = (sheetType == SheetType.Tiff) ? Path.Combine(jobFolder, $@"{filePart}.tif") : Path.Combine(jobFolder, $@"{i + 1}.jpg");
string mimeType = sheetType == SheetType.Tiff ? "image/tiff" : "image/jpeg";
EncoderValue encoder = sheetType == SheetType.Tiff ? EncoderValue.CompressionCCITT4 : EncoderValue.CompressionNone;
ImageCodecInfo myImageCodecInfo = null;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (int j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
myImageCodecInfo = encoders[j];
}
System.Drawing.Imaging.Encoder myEncoder;
myEncoder = System.Drawing.Imaging.Encoder.Compression;
EncoderParameters myEncoderParameters;
myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter;
myEncoderParameter = new EncoderParameter(myEncoder, (long)encoder);
myEncoderParameters.Param[0] = myEncoderParameter;
bitmap.Save(path, myImageCodecInfo, myEncoderParameters);
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Is this issue reproduced when you saving rendered image as png or jpg (without any ImageCodecInfo)? Could you please provide the source pdf? Edited by user Monday, August 21, 2017 6:42:32 AM(UTC)
| Reason: Not specified
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Originally Posted by: Paul Rayman  Is this issue reproduced when you saving rendered image as png or jpg (without any ImageCodecInfo)?
Could you please provide the source pdf? Yes, it happens when you save as jpg. you don't need to save the image to make it happen. if you get the bitmap and put it in an PictureBox, same problem occurs. Here is the source pdf: https://www.dropbox.com/...0B5504ad1_plans.pdf?dl=0
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Rank: Administration
Groups: Administrators
Joined: 1/5/2016(UTC)
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Was thanked: 133 time(s) in 130 post(s)
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Your code can't be compiled, so I have tested your PDF document with code below. There is no any problems with rendering. Anyway, the following code shows the recommended way to rendering PDF. Code:
float dpi = 300;
using (var doc = PdfDocument.Load(@"d:\9\01-0B5504ad1_plans.pdf"))
{
int i = 0;
foreach(var page in doc.Pages)
{
int w = (int)(page.Width * dpi / 72);
int h = (int)(page.Height * dpi / 72);
using (var bitmap = new PdfBitmap(w, h, true))
{
bitmap.FillRect(0, 0, w, h, Color.White);
page.Render(bitmap, 0, 0, w, h, PageRotate.Normal, RenderFlags.FPDF_ANNOT);
bitmap.Image.Save(string.Format(@"d:\9\output\01-0B5504ad1_plans_{0}.png", ++i), ImageFormat.Png);
}
page.Dispose();
}
}
Edited by user Monday, August 21, 2017 8:50:22 AM(UTC)
| Reason: Not specified
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Rank: Guest
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the output file doesn't seem to have a 300dpi resolution. when i try to put any kind of compression it crashes. here is an example for TIFF CCITT4. Note: There is no dispose, because i dispose it manually later. Code:
private int DPI = 300;
public Image GetPdfImage(string tempFilename, int pageNumber = 0)
{
PdfCommon.Initialize(PDFIUMKEY);
FileInfo fileInfo = new FileInfo(tempFilename);
Image image = null;
using (var doc = PdfDocument.Load(fileInfo.FullName))
{
//Enumerate all pages sequentially in a given document
TotalPages = doc.Pages.Count;
if (doc.Pages.Count > 0)
{
var page = doc.Pages[pageNumber];
//Gets page width and height measured in points. One point is 1/72 inch (around 0.3528 mm)
int pixelsWidth = (int)(page.Width * DPI / 72);
int pixelsHeight = (int)(page.Height * DPI / 72);
var bitmap = new PdfBitmap(pixelsWidth, pixelsHeight, true);
bitmap.FillRect(0, 0, pixelsWidth, pixelsHeight, Color.White);
page.Render(bitmap, 0, 0, pixelsWidth, pixelsHeight,
Patagames.Pdf.Enums.PageRotate.Normal,
Patagames.Pdf.Enums.RenderFlags.FPDF_ANNOT);
ImageCodecInfo myImageCodecInfo = null;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (int j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == "image/tiff")
myImageCodecInfo = encoders[j];
}
System.Drawing.Imaging.Encoder myEncoder;
myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters myEncoderParameters;
myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter;
myEncoderParameter = new EncoderParameter(myEncoder, (long)EncoderValue.CompressionCCITT4);
myEncoderParameters.Param[0] = myEncoderParameter;
Image.Save("output.tiff", myImageCodecInfo, myEncoderParameters);
//This.Image = bitmap.Image; <-- i dispose it manually someplace else
page.Dispose();
}
}
PdfCommon.Release();
return image;
}
btw, thanks a lot for the quick responses. Edited by user Monday, August 21, 2017 9:18:40 AM(UTC)
| Reason: forgot to add my thanks
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Rank: Administration
Groups: Administrators
Joined: 1/5/2016(UTC)
Posts: 1,138
Thanks: 10 times
Was thanked: 133 time(s) in 130 post(s)
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Where exactly does it crash, and with what exception?
Could you please provide stack trace.
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