On Oct 1, 2011 1:12 PM, "jaaf64" <<a href="mailto:jaaf.forums@zoraldia.com">jaaf.forums@zoraldia.com</a>> wrote: > > hi, > I am new to cairo and to graphics in general. > I have trouble understanding the fact that PdfSurface or (PsSurface) is only 72 points per inch. > Does this mean that I cannot benefit from the printer s'capability (300 or 600 dpi per inch) ? > There's four different issues: 1: measuring distances. This is where 72 comes from. Initially a PdfSurface measures everything in points (1/72th of an inch or 0.3(?) mm). You can use more precise sizes by using floats or change the scale with ctx.scale(). 2: Vector images. These are sent as-is to your printer or your printer driver. The RIP in the printer or the driver will determine the resolution of lines and text. You can use the same PDF for different devices. 3: images. Images are stored in their original resolution: scaling a 1000x1000 px image to 1x1 inch will lead to a portion of the PDF to be 1000ppi. Using the same image as 2x2 inch makes that part 500ppi. 4: fallback images. some operations in cairo can not be saved as simple PDF commands. Cairo generates images and saves them in the PDF file. The resolution of these images can be set with set_fallback_resolution() and are 300ppi by default. Met vriendelijke groet, Arjen Nienhuis <div class="gmail_quote">On Oct 1, 2011 1:12 PM, "jaaf64" <<a href="mailto:jaaf.forums@zoraldia.com" target="_blank">jaaf.forums@zoraldia.com</a>> wrote: > hi, > I am new to cairo and to graphics in general. > I have trouble understanding the fact that PdfSurface or (PsSurface) is > only 72 points per inch. > Does this mean that I cannot benefit from the printer s'capability (300 > or 600 dpi per inch) ? > > -- > cairo mailing list > <a href="mailto:cairo@cairographics.org" target="_blank">cairo@cairographics.org</a> > <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> </div>