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 Image quality pdf to tiff		  New Topic  Reply to Topic
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Ole Ekerhovd

Norway
4 Posts
Posted - Dec 11 2021 :  04:32:01  Show Profile  Reply
Hi

I load a pdf file into a ImageEnmView.

After that I save to a database as Tiff (blob).

for i:=0 to imageenmview1.ImageCount-1 do
begin
imageenmview1.MIO.Params[i].TIFF_Compression:=ioTIFF_JPEG;
imageenmview1.MIO.Params[i].BitsPerSample:=2;
end;

The picture quality gets a bit blurry using above code.

As there are thousands of files saved to the database, size of saved data is important.
(Also client program and the database are at separate locations)

Is it possible to reduce size and at the same time maintain most of the quality?

xequte

38613 Posts
Posted - Dec 12 2021 :  00:26:46  Show Profile  Reply
Hi Ole

What engine are using to load the PDF? iepdf32.dll?

What is the StoreType of TImageEnMView (should be ietNormal).

If size is important and you are using ioTIFF_JPEG compression, why not just save to JPEG file?

Nigel
Xequte Software
www.imageen.com
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Ole Ekerhovd

Norway
4 Posts
Posted - Dec 13 2021 :  13:16:29  Show Profile  Reply
Hi Nigel

I use the iepdf32.dll. The pdf is "great looking" in the viewer, it is when I compress/save it gets blurry.

Store Type is ietNormal.

I need to use tiff, often there are several pages.

What are the best settings to reduce size and maintain as much of the quality as possible? Is ioTIFF_JPEG suitable?

Actually what I am working with is invoices, often with small letters and they can be hard to read after I have compressed the image.
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xequte

38613 Posts
Posted - Dec 13 2021 :  17:39:52  Show Profile  Reply
Hi Ole

This works well for me:

// Convert a multi-page PDF file to TIFF
// Ensure iepdf.dll is in the EXE folder
mbmp := TIEMultiBitmap.Create( 'D:\multi.pdf' );
mbmp.Params[0].TIFF_Compression := ioTIFF_LZW;
mbmp.DuplicateCompressionInfo();
mbmp.Write( 'D:\Converted.TIFF' );
mbmp.Free;


ioTIFF_JPEG should be good for color PDF files. It gives better compression than ioTIFF_LZW, without significant degredation.

Nigel
Xequte Software
www.imageen.com
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Ole Ekerhovd

Norway
4 Posts
Posted - Dec 13 2021 :  23:10:17  Show Profile  Reply
Thanks Nigel

Works great.

Compressed and fully readable :)

Pdf=200kb
ioTIFF_LZW=147kb
ioTIFF_JPEG=76kb

Regards from Norway,
Ole
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