XnView Software

Posted: **Thu Jan 22, 2009 9:55 am**

Hi there,

I'm using the GFlax object in my ASP code to convert a PDF file into JPG files. I am finding that the JPEg conversions are a lot worse quality than the original file. My code is as follows:

Code: Select all

    'Sub to chop up PDF file
    sub chopPDF(strPDFLocation, strJPGSaveLocation)
    
        with graphicsCom
            .EpsDpi = 72
            .page = 1
            .LoadBitmap(strPDFLocation)
            
            'Loop through each page in the pdf and save it
            for i = 1 to .NumberOfPages

                .Page = i
                .Saveformat = 1
                .SaveJPEGProgressive = true
                .SaveJPEGQuality = 100  
                .saveBitmap(strJPGSaveLocation & "/" & GetFileName(strPDFLocation) & "_Page" & i & ".jpg")
       
                'Detect width and height
                lngDetectedWidth = .width
                lngDetectedHeight = .height

                'Create the thumbnail               
                .resize THUMB_WIDTH, lngDetectedHeight * (THUMB_WIDTH/lngDetectedWidth)
                .saveBitmap(strJPGSaveLocation & "/thumbnails/" & GetFileName(strPDFLocation) & "_Page" & i & ".jpg")
                
            next                    

        end with 
        
    end sub

An example of the input PDF and output JPG file can be found below:
http://rapidshare.com/files/187557996/PDFJPEG.zip.html

Thanks for any assistance.

Tom

Posted: **Thu Jan 22, 2009 10:10 am**

And if you change EpsDPI?

Posted: **Thu Jan 22, 2009 10:30 am**

Thanks for the prompt reply.

Setting the epsdpi to 500 seems to bring it out losslessly, I don't have much idea what epsdpi is, what is it's maximum value? And what does it mean?

(Sorry, I really did look for documentation but couldn't find much!)

Thanks for your help

Posted: **Thu Jan 22, 2009 12:27 pm**

HoldThem wrote:Thanks for the prompt reply.

Setting the epsdpi to 500 seems to bring it out losslessly, I don't have much idea what epsdpi is, what is it's maximum value? And what does it mean?

It's the dpi used to load pdf

Posted: **Thu Jan 22, 2009 12:29 pm**

Anyway to detect the DPI from the PDF when you load it? And also, if I specify a DPI over the DPI of the pdf, will it create any problems (ie pointless larger file sizes etc)

XnView Software

Converting from PDF to JPEG bad quality

Converting from PDF to JPEG bad quality

Re: Converting from PDF to JPEG bad quality