Draw Image in PDF

[Barbara Tacchino]

Hello,

my development team and I are evaluating to buy PDF Essentials, so we are doing some tests about writing in PDF using Syncfusion.Pdf.Graphics.PdfGraphics object.
In particular we are trying to draw an image using the following code:

PdfDocument wPDFDOC = new PdfDocument();
PdfPage wPDFPage = wPDFDOC.Pages.Add();
PdfGraphics wPDFGraphics = wPDFPage.Graphics;
PdfImage wPdfImage = PdfImage.FromFile (@"c:\testBitmap.bmp");

//the image size has heigth:51 and width :429 the physical dimensions are Height:38.25 and Width: 312.75

wPdfImage.Draw(wPDFGraphics, 0, 0);
wPDFDOC.Save(@"c:\testBitmap.pdf");


As result, the image printed on a pdf file is larger and stretched. It seems that the drawn image is using the image pixels size as points without any unit conversion.

Thanks



ImageError_9fd86d2e.zip

[Meiyappan R]

Hi Barbara,

Thank you for your interest in syncfusion products.

In the image the units are measured in pixels.In pdf the units are measured in points.While drawing we make unit conversions from pixels to points.Even if the units are converted we need to set the page scale explicitly.We have modified your sample to produce the image of expected size.Could you please look into the modified sample attached to the below link.

http://help.syncfusion.com/samples/pdf/ModifiedSample.zip

Kindly let us know if it works.

Regards
Meiyappan

[Barbara Tacchino]

Hello,

thank you very much for your reply. The solution you provided seems to be ok in my tests.
The only thing I would like to ask you is the following: since after the image, in the same page, I may have to write also text, is it correct to restore the graphics transformation with this line (in my tests it seems to work):

wPDFPage.Graphics.ScaleTransform(1.136f, 1.136f);

Thanks in advance for your reply.

Best regards,

Barbara

[Karthik M]

Hi Barbara,

Thank you for your update.

Yes, you are correct. We need to restore the current graphics state before performing subsequent drawing.

Please find the sample illustrating the same from the below location and let us know if this helps.

http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=WorkingwithImage_Restore-2000333351.zip

Best Regards,
Karthik

[Marius Marin]

Hello,

I have a similar issue. Adjusting the scale as in your example:

    //the image size has heigth:51 and width :429 the physical dimensions are Height:38.25 and Width: 312.75

    wPDFPage.Graphics.ScaleTransform(.88f, .88f); 

fixed the image stretching.

However, I can't figure out how you did compute the 0.88 scalling factor...

I appreciate if you could help me with that.

Regards,

Marius

[Karthikeyan Chandrasekar]

Hi Marius,

Thank you for your information.

 

The scaling factor is the conversion of pixel to points.

The scaling factor should be 0.75f, and the code snippet is:

wPDFPage.Graphics.ScaleTransform(.75f, .75f);

 

I have attached a sample with these code changes for your reference.

WorkingwithImage.zip

 

Please let us know if you have any concern.

 

Thanks,

Karthikeyan.C

[caimage]

so much need to pay attention to when we are draw in pdf c#. pixels and points required to be changed.  we also should to scale the image height and width.

[caimage]

so much need to pay attention to when we are draw in pdf c#. pixels and points required to be changed.  we also should to scale the image height and width.

[Karthikeyan Chandrasekar]

Hi Caimage,
Thank you for sharing the information.

Thanks,
Karthikeyan.C

[jonathan crawford]

Hi

 

I do not understand where you get the .75f and .88f from in the examples above.

This is not clear from your code. I thopught a scaling constant would be constant.

 

I cannot get my images to display correctly

 

Thanks

 

jc