Re: Tiff to PDF Lossy image quality

Hello, I'm trying to save a tif file in pdf format.
With the pdf plugin I'have'n any problem, the problem is the quality of the file.
When I save my tif file in pdf format i have a loss of quality picture.
Maybe I have an error of my code?

This is the code:

Leadtools.Codecs.RasterCodecs _codecs = new Leadtools.Codecs.RasterCodecs();

MemoryStream fStream = new MemoryStream(pFileBuf);

Leadtools.Codecs.CodecsImageInfo info = _codecs.GetInformation(fStream, true);

Leadtools.RasterImage _image = _codecs.Load(
                fStream,
                0, Leadtools.Codecs.CodecsLoadByteOrder.BgrOrGray,
                1, info.TotalPages);

string imageName = "TEST"+ _Ext_Pdf_;

string imageLocalPath = _workPath + imageName;

RasterImageFormat _format = RasterImageFormat.RasPdfG4;

_codecs.Save(_image, imageLocalPath, _format, info.BitsPerPixel,
                    firstPage, lastPage, 1, Leadtools.Codecs.CodecsSavePageMode.Overwrite);

I have also tried with the lead tools demo program to write a datamatrix into a pdf file and save this pdf. Also in this case I have a lossy  image quality to the pdf final file. Why?
thank you very much.

Andrea

Andrea,

To improve the quality of the result PDF image, try to set the codecs.Options.Pdf.Save.UseImageResolution property to true before saving the image.

Also, what is the exact raster PDF format that you use when you save the PDF image?

Thanks,
Maen Badwan
LEADTOOLS Technical Support

The problem might be caused by low resolution used when loading the PDF file. To increase it to 300 DPI, set the RasterCodecs.Options.Pdf.Load.XResolution and RasterCodecs.Options.Pdf.Load.YResolution properties to 300 before you load the source image.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

I have tried to set the image quality with:

 _codecs.Options.Load.XResolution = 300;
 _codecs.Options.Load.YResolution = 300;

but the result is the same.
The curious thing is that when i execute this part of code:

Leadtools.RasterImage bcImage = _codecs.Load(
                inputFileName1,
                0, Leadtools.Codecs.CodecsLoadByteOrder.BgrOrGray,
                1, info.TotalPages);

SizeF paperSize = new SizeF(bcImage.Width, bcImage.Height);

I see that the bcImage width is 597 and bcImage.height is 841 but
the original width of image file is 1654 and original height is 2339.
The original pdf file size is 72KB but the final pdf converted with leadtools is 1472KB.

What's wrong???

Thanks.

Andrea

You are setting the wrong properties, which do not affect the PDF file.
Instead of _codecs.Options.Load.XResolution and _codecs.Options.Load.YResolution properties, you need to set the _codecs.Options.Pdf.Load.XResolution and _codecs.Options.Pdf.Load.YResolution properties to 300 before loading the PDF file.

About the size of the PDF file, please open a new thread and explain the issue. In the new thread, mention if the original file is an image PDF or a text document (searchable) PDF. If you're not sure, and attach a sample PDF in a ZIP or RAR file.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Yes with the option.pdf.lod.Xresolution = 300 the quality is ok, but I have the size problem.

I will open a new thread.

Thanks

Andrea