<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body bgcolor="#FFFFFF" text="#000000"> <tt>The good news is:</tt> <tt>I downloaded cairo source 1.14.12 and compiled it on RHEL 7.5, which creates libcairo.so.2.11400.12</tt> <tt>If I throw this into /usr/lib64 and run ldconfig, the problem goes away.</tt> <tt>Font size varies in steps as it should.</tt> <tt> </tt><tt>[alois@as80 devlop]$ ctest1</tt><tt> bitmap </tt><tt>9.0 pt on Size: 49x7 9.0 pt off Size: 45.4966x6.80713</tt><tt> </tt><tt>9.1 pt on Size: 49x7 9.1 pt off Size: 46.0021x6.88276</tt><tt> </tt><tt>9.2 pt on Size: 49x7 9.2 pt off Size: 46.5076x6.9584</tt><tt> </tt><tt>9.3 pt on Size: 49x7 9.3 pt off Size: 47.0131x7.03403</tt><tt> </tt><tt>9.4 pt on Size: 49x7 9.4 pt off Size: 47.5187x7.10967</tt><tt> </tt><tt>9.5 pt on Size: 51x7 9.5 pt off Size: 48.0242x7.1853</tt><tt> </tt><tt>9.6 pt on Size: 51x7 9.6 pt off Size: 48.5297x7.26094</tt><tt> </tt><tt>9.7 pt on Size: 51x7 9.7 pt off Size: 49.0352x7.33657</tt><tt> </tt><tt>9.8 pt on Size: 51x7 9.8 pt off Size: 49.5407x7.41221</tt><tt> </tt><tt>9.9 pt on Size: 51x7 9.9 pt off Size: 50.0462x7.48784</tt><tt> </tt><tt>10.0 pt on Size: 51x7 10.0 pt off Size: 50.5518x7.56348</tt> <tt></tt><tt>[alois@as80 devlop]$ ctest2</tt><tt> PDF </tt><tt>9.0 pt on Size: 45.4966x6.80713 9.0 pt off Size: 45.4966x6.80713</tt><tt> </tt><tt>9.1 pt on Size: 46.0021x6.88276 9.1 pt off Size: 46.0021x6.88276</tt><tt> </tt><tt>9.2 pt on Size: 46.5076x6.9584 9.2 pt off Size: 46.5076x6.9584</tt><tt> </tt><tt>9.3 pt on Size: 47.0131x7.03403 9.3 pt off Size: 47.0131x7.03403</tt><tt> </tt><tt>9.4 pt on Size: 47.5187x7.10967 9.4 pt off Size: 47.5187x7.10967</tt><tt> </tt><tt>9.5 pt on Size: 48.0242x7.1853 9.5 pt off Size: 48.0242x7.1853</tt><tt> </tt><tt>9.6 pt on Size: 48.5297x7.26094 9.6 pt off Size: 48.5297x7.26094</tt><tt> </tt><tt>9.7 pt on Size: 49.0352x7.33657 9.7 pt off Size: 49.0352x7.33657</tt><tt> </tt><tt>9.8 pt on Size: 49.5407x7.41221 9.8 pt off Size: 49.5407x7.41221</tt><tt> </tt><tt>9.9 pt on Size: 50.0462x7.48784 9.9 pt off Size: 50.0462x7.48784</tt><tt> </tt><tt>10.0 pt on Size: 50.5518x7.56348 10.0 pt off Size: 50.5518x7.56348</tt> <div class="moz-cite-prefix">On 29.09.18 11:25, Alois Treindl wrote: </div> <blockquote type="cite" cite="mid:2d99b847-3691-b2b1-8bbc-620b0fcc1082@astro.ch"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> It is important to know which version of cairo I am using. The sample I posted earlier is run on cairo-1.14.8-2.el7.x86_64on RHEL7.5 The problem appeared only with the update of Redhat Linux from RHEL6 to RHEL7. If I run the samples on the old machine, which has cairo-1.10.2-1.el6.x86_64, the fonts scale properly: </blockquote> </body> </html>