[SOLVED] Using QPainter to Import JPG for PDF Report

[KaptainKarl]

PDFWriter.width() = 9583
PDFWriter.height() = 13699

Karl

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Added after 18 minutes:

The scaling concept helped.
Here's how I got a logo that looks appealing.
I do not want the logo to consume more than a third of the width of the page nor a fifth of height.
So I scaled using these values:

// Scaled images
   quint32 iWidth = pdfWriter.width();
   quint32 iHeight = pdfWriter.height();
   QSize s(iWidth/3, iHeight/5);
   QPixmap pxScaledPic = pxPic.scaled(s, Qt::KeepAspectRatio, Qt::FastTransformation);
   painter.drawPixmap(0, iYPos, pxScaledPic.width(), pxScaledPic.height(), pxScaledPic);
   iYPos += pxScaledPic.height() + 250;

// Scaled images
   quint32 iWidth = pdfWriter.width();
   quint32 iHeight = pdfWriter.height();
   QSize s(iWidth/3, iHeight/5);
   QPixmap pxScaledPic = pxPic.scaled(s, Qt::KeepAspectRatio, Qt::FastTransformation);
   painter.drawPixmap(0, iYPos, pxScaledPic.width(), pxScaledPic.height(), pxScaledPic);
   iYPos += pxScaledPic.height() + 250;

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Thanks for the help.

Karl

[ChrisW67]

In general, for good quality print output you need much larger images that render at the right physical size at the print resolution (or that you scale down). So, for example, at 300DPI you need a 600x300 pixel image to get a 2x1 inch image on paper.

What is the output like if you use the original pixmap and specify the drawPixmap() width and height in painter cordinates? These look like they might be 300 DPI or thereabouts.

Do you get the QImage result if you call QPainetr::end() before you exit the program?

[KaptainKarl]

Unfortunately I will not have control over the size of the image.
I can only make suggestions to the customer as to what will look best.
I will include comments similar to yours in the documentation.

The output of drawPixMap with adjusted width and height arguments does not look as good as the scaled QPixmap.

Putting painter.end() at the bottom of the program eliminated all the images; QPixmap and QImage.

Karl