----- Original Message -----
From: "Jerold Sampson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, July 21, 2003 16:23
Subject: [iText-questions] PDF File Image Sizes
> Greetings,
>
> I have been creating PDF files containing images converted from
> another format. The results are good but I have some performance
> related questions.
>
> I create the image using either of the two following methods:
>
> // 8-bit logic
> int transparency[] = {255, 255};
> byte[] ib = new byte[tkn.hs*tkn.vs];
> //Tp.binToBytes(tkn.iData,ib,tkn.hs,255,0);
> Tp.binToBytes(tkn.iData,ib,tkn.hs);
> pdfImage =
> com.lowagie.text.Image.getInstance(tkn.hs,tkn.vs,1,8,ib,transparency);
>
> // 1-bit logic
> int transparency[] = {1, 1};
> pdfImage =
> com.lowagie.text.Image.getInstance(tkn.hs,tkn.vs,1,1,tkn.iData,transpare
> ncy);
>
> The image data source it always 1-bit (black and white) data.
>
> As one would expect the 1-bit logic runs faster since I don't have to
> translate
> binary image data to 8-bit. However the resulting PDF uses CCITT
> compression which
> for some reason actually results in larger PDF files than the 8-bit
> logic.
That's surprising but possible if there are many bw transitions.
> The 8-bit logic uses the standard flatedecode. Also, using something
> other
> than
> CCITT compression may by faster . . . maybe!
>
> These results are to say the least counter intuitive!
>
> Is there a way to tell iText to use flatedecode or some other
> compression
> scheme with
> the 1 bit image? We are trying to get the best combination of
> performance
> and file
> size we can.
Use ImgRaw() directly.
Best Regards,
Paulo Soares
>
> Can anyone shed some light on this subject? . . . I'm abit baffled by
> this!
>
> Thanks,
> Jerold Sampson
>
>
>
>
>
>
> Jerold R Sampson
> TallPine Technologies, Inc.
>
> www.tallpine.com
> 303-415-1203
>
>
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