Pdf and png produce different images

ROOT
1

The following code produces the png and pdf images, screenshots of which are below in the same order. For the pdf, the star marker is reversed, also the lines look much thicker and the dashes have more spacing between them, also the border line and the axis ticks are much thicker. Do you people also get this problem and is this a bug?

import ROOT

graphs = ROOT.TMultiGraph()
canvas = ROOT.TCanvas("c","c",1400,900)

for i in range(5):
    graph = ROOT.TGraph()
    graph.SetPoint(0,3,1+i)
    graph.SetPoint(1,5,1+i)
    graph.SetMarkerStyle(29)
    graph.SetMarkerSize(5)
    graph.SetLineStyle(7)
    graphs.Add(graph, "lp")

graphs.Draw("A")
graphs.GetXaxis().SetLimits(2.5,5.5)

canvas.Modified()
canvas.Update()
canvas.SaveAs("test.png")
canvas.SaveAs("test.pdf")

image
image.png1326×824 13.9 KB
image
image.png1320×819 26.4 KB

ROOT Version: 6.19.01
Platform: Ubuntu 18.04
Compiler: gcc 7.4
Python: 3.6.8

2

Hi,

@couet might know more.

3

I will check the marker orientation in pdf and ps output

4

I made a JIRA report: https://sft.its.cern.ch/jira/browse/ROOT-10391

5

Thanks, and if the line styles and thicknesses would look the same in the pdf and png that would also be great.

6

Pdf is vector oriented and png is binary. The definition is not the same intrinsically. We tried to do the best matching but you might find it not good enough. There is a parameter to adjust that: https://root.cern/doc/master/classTStyle.html#afd8ef8c007d36f2382436a3b7eeef900

7

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.

8

Now fixed in master. Will be fixed in 6.20