Matplotlib - How to plot a high resolution graph

Question

I ve used matplotlib for plotting some experimental results  discussed it in here  Looping over files and plotting  However  saving the picture by clicking right to the image gives very bad quality   low resolution images   from glob import glob import numpy as np import matplotlib pyplot as plt import matplotlib as mpl    loop over all files in the current directory ending with  txt for fname in glob      txt          read file  skip header  1 line  and unpack into 3 variables     WL  ABS  T   np genfromtxt fname  skip header 1  unpack True         first plot     plt plot WL  T  label  BN   color  blue        plt xlabel  Wavelength  nm        plt xlim 200 1000      plt ylim 0 100      plt ylabel  Transmittance          mpl rcParams update   font size   14        plt legend loc  lower center       plt title         plt show       plt clf           second plot     plt plot WL  ABS  label  BN   color  red       plt xlabel  Wavelength  nm        plt xlim 200 1000      plt ylabel  Absorbance  A       mpl rcParams update   font size   14        plt legend       plt title         plt show       plt clf     Example graph of what I m looking for  example graph

User · Answer

use plt figure dpi 1200  before all your plt plot    and at the end use plt savefig     see  http   matplotlib org api pyplot api html matplotlib pyplot figure and http   matplotlib org api pyplot api html matplotlib pyplot savefig

User · Answer

You can use savefig   to export to an image file   plt savefig  filename png     In addition  you can specify the dpi argument to some scalar value  for example   plt savefig  filename png   dpi 300

User · Answer

You can save your graph as svg for a lossless quality   import matplotlib pylab as plt  x   range 10   plt figure   plt plot x x  plt savefig  graph svg

User · Answer

For saving the graph   matplotlib rcParams  savefig dpi     300  For displaying the graph when you use plt show     matplotlib rcParams  figure dpi     100  Just add them at the top

User · Answer

For future readers who found this question while trying to save high resolution images from matplotlib as I am  I have tried some of the answers above and elsewhere  and summed them up here  Best result  plt savefig  filename pdf   and then converting this pdf to a png on the command line so you can use it in powerpoint  pdftoppm -png -r 300 filename pdf filename OR simply opening the pdf and cropping to the image you need in adobe  saving as a png and importing the picture to powerpoint Less successful test  1  plt savefig  filename png   dpi 300  This does save the image at a bit higher than the normal resolution  but it isn t high enough for publication or some presentations  Using a dpi value of up to 2000 still produced blurry images when viewed close up  Less successful test  2  plt savefig  filename pdf   This cannot be opened in Microsoft Office Professional Plus 2016  so no powerpoint   same with Google Slides  Less successful test  3  plt savefig  filename svg   This also cannot be opened in powerpoint or Google Slides  with the same issue as above  Less successful test  4  plt savefig  filename pdf   and then converting to png on the command line  convert -density 300 filename pdf filename png but this is still too blurry when viewed close up  Less successful test  5  plt savefig  filename pdf   and opening in GIMP  and exporting as a high quality png  increased the file size from  100 KB to  75 MB  Less successful test  6  plt savefig  filename pdf   and then converting to jpeg on the command line  pdfimages -j filename pdf filename This did not produce any errors but did not produce an output on Ubuntu even after changing around several parameters

User · Answer

At the end of your for   loop  you can use the savefig   function instead of plt show   and set the name  dpi and format of your figure    E g  1000 dpi and eps format are quite a good quality  and if you want to save every picture at folder    with names  Sample1 eps    Sample2 eps   etc  you can just add the following code   for fname in glob      txt          Your previous code goes here                plt savefig       eps  format fname   bbox inches  tight   format  eps   dpi 1000

[python] Matplotlib - How to plot a high resolution graph?

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