I sometimes annotate plots using images (png format), and I want the image data not to be touched when saving to pdf: just put the data and the correct transformation in the pdf, if possible.
So instead of having a "fixed" dpi (which does not really make sense for vector formats anyway), passing something likedpi ='raw' (for example) would simply do what I explained before.

Even when explicitely addingresample = False, matplotlib still resample the image (I know this value is the default, but still). I don't know if this is a bug report or a feature request, I'm enclined to the former.

importnumpyasnpimportmatplotlibmatplotlib.use("agg")importmatplotlib.pyplotaspltdefadd_image(axe,filename,position,zoom):img=plt.imread(filename)off_img=matplotlib.offsetbox.OffsetImage(img,zoom=zoom,resample=False)art=matplotlib.offsetbox.AnnotationBbox(off_img,position,xybox= (0,0),xycoords=axe.transAxes,boxcoords="offset points",frameon=False)axe.add_artist(art)# ==========fig=plt.figure()axe=plt.axes()fig.set_size_inches(3,1.5)axe.plot(np.arange(10),np.arange(10))add_image(axe,"image.png",position= (0.2,0.7),zoom=0.07)fig.savefig("temp.pdf",bbox_inches="tight",pad_inches=0)

Use it withthis image from wikipedia asimage.png.

Actual outcome (screenshot):

Expected outcome (screenshot):

Matplotlib:

• Version: 3.1.2
• Backend: PDF
• Python: 3.7 64bit
• Installed via:pip
• OS: Windows 10

Thank you