Convert postscript to jpeg

Question

I have the ghostscript dll (gsdll32.dll) which I have wrapped into my c# application. I tried various way to convert postscript to jpeg but it's not happening. The code is as follows:

            PDFPrinter.WGhostScript gs = new PDFPrinter.WGhostScript();
            gs.AddParam("-sDEVICE=jpeg");
            gs.AddParam("-dJPEGQ=100");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-dBATCH");
            gs.AddParam("-dSAFER");
            gs.AddParam("-r300");
            string outfile = txtOutFolderLoc.Text + txtFileName.Text + ".jpg";
            gs.AddParam(@"-sOutputFile=" + outfile);
            gs.AddParam(psFilePath);
            gs.Execute();
            Application.Exit();

What might be the reasons?

I have the postscript location at hand in the string "psFilePath".
"outfile" represents the location and file name of the output.

[I have used the same stuff and converted the postcript to PDF and PNG as following].

To PDF WORKED

            gs.AddParam("-dBATCH");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-sDEVICE=pdfwrite");
            gs.AddParam("-sPAPERSIZE=a4");
            gs.AddParam("-sProcessColorModel=DeviceGray");
            gs.AddParam("-sPDFPassword=password");
            string outfile = txtOutFolderLoc.Text + txtFileName.Text + ".pdf";
            gs.AddParam(@"-sOutputFile=" + outfile);
            gs.AddParam(psFilePath);
            gs.Execute();
            Application.Exit();

TO PNG CODE:

            gs.AddParam("-dSAFER");
            gs.AddParam("-dBATCH");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-sDEVICE=png16m");
            gs.AddParam("-dGraphicsAlphaBits=4");
            gs.AddParam(@"-sOutputFile=" + txtOutFolderLoc.Text + txtFileName.Text + "%i.png");
            gs.AddParam(psFilePath);
            gs.Execute();
            Application.Exit();

EDIT I The postscript is being generated and the application continues till it exits. But no jpeg file is found.

The postscript is generated by a postscript printer provided with the ghostscript. Once this postscript is generated the control is transferred to the application that converts this PS.

can you elaborate on "its not happening." no file, empty file, wrong contents? and all you've changed between the working PDF and PNG versions is the -sDEVICE? could the postscript be missing showpage? that can lead to inconsistent results unless you run it through ps2eps first. — luser droog
@luser droog: Thanks for you reply. I've edited the content & I've added the code to convert the PS to PDF and PNG. Both the functions are working fine. But the JPEG code seems like its not generating the output file. — user1976596
That's about all I know from having used the commandline version for these types of conversions. But it's a much stronger, more answerable question now. Good job. +1 Welcome to the site! — luser droog
are you processing printer-driver output? that might have hardware control code in it that is unsupported by pdf. Some things to try: run gs from command line, so you will see any error messages; 2 test your program code with very clean/simple postscript code. — agentp

Unknown Unknown · Accepted Answer · 2013-01-22T13:44:18

I managed to get the output with the following arguments:

            PDFPrinter.WGhostScript gs = new PDFPrinter.WGhostScript();
            gs.AddParam("-q");
            gs.AddParam("-dNOPAUSE");
            gs.AddParam("-dBATCH");
            gs.AddParam("-sDEVICE=jpeg");
            gs.AddParam(@"-sOutputFile=<full oytput file path>%i.jpg");
            gs.AddParam(<psFilePath>);

I had to add in the "-q" to get it done.

'-q to prevent Ghostscript from writing messages to standard output which become mixed with the intended output stream.'

Convert postscript to jpeg

1 Answers