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Strange brightness/contrast of rendered image
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ju1989  
#1 Posted : Thursday, June 7, 2018 12:30:17 AM(UTC)
ju1989

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Posts: 28
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I have a PDF document which gets rendered very strange. I think it is a Problem of contrast and brightness.

I use the following Code to get the Image.



Code:

using (MemoryStream bitmapStream = new MemoryStream())
{
	lock (lockObject)
	{
		using (var bitmap = new Bitmap(targetWidth, targetHeight))
		{
			using (var g = Graphics.FromImage(bitmap))
			{
				g.FillRectangle(new SolidBrush(Color.White), 0, 0, targetWidth, targetHeight);
				using (var pdfBitmap = new PdfBitmap(targetWidth, targetHeight, true))
				{
					page.Render(pdfBitmap, 0, 0, targetWidth, targetHeight, PageRotate.Normal, RenderFlags.FPDF_ANNOT);
					g.DrawImageUnscaled(pdfBitmap.Image, 0, 0);
				}
			}
			bitmap.Save(bitmapStream, imageFormat);
			return bitmapStream.ToArray();
		}
	}
}


Attached is the PDF document document.pdf (894kb) downloaded 7 time(s)., the output image of Adobe Reader output_acrobat.png (1,035kb) downloaded 8 time(s). and the output of the Code above output_pdfium.png (680kb) downloaded 7 time(s)..

Do you have any ideas how to fix it?
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Paul Rayman  
#2 Posted : Friday, June 8, 2018 7:20:29 AM(UTC)
Paul Rayman

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The code below produce normal output image.
I do not know how you could get other one. Can you provide the full code?

Code:

            using (var doc = PdfDocument.Load(@"d:\0\4\document.pdf"))
            {
                using (var page = doc.Pages[0])
                {
                    int targetWidth = (int)(page.Width / 72.0f * 96.0f);
                    int targetHeight = (int)(page.Height / 72.0f * 96.0f);
                    using (var bitmap = new Bitmap(targetWidth, targetHeight))
                    {
                        using (var g = Graphics.FromImage(bitmap))
                        {
                            g.FillRectangle(new SolidBrush(Color.White), 0, 0, targetWidth, targetHeight);
                            using (var pdfBitmap = new PdfBitmap(targetWidth, targetHeight, true))
                            {
                                page.Render(pdfBitmap, 0, 0, targetWidth, targetHeight, PageRotate.Normal, RenderFlags.FPDF_ANNOT);
                                g.DrawImageUnscaled(pdfBitmap.Image, 0, 0);
                            }
                        }
                        bitmap.Save(@"d:\0\4\output.png", System.Drawing.Imaging.ImageFormat.Png);
                    }
                }
            }
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ju1989  
#3 Posted : Monday, June 11, 2018 3:51:51 AM(UTC)
ju1989

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Joined: 6/1/2016(UTC)
Posts: 28
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Location: Hessen

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Was thanked: 1 time(s) in 1 post(s)
Sorry, my mistake. It is an additional applied DirectX shader.

-> closed
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