MATLAB: Create a high resolution PDF images-CodePudding

I am trying to convert a high resolution image (30in width x 60in height) to a pdf file in MATLAB. I tried print, exportgraphics, and couple scripts online but I keep getting low quality output. I also tried setting the resolution to 300dpi but it didnt work. Please if you have any suggestions, share with me and I will test. Many thanks!

Image file used (renamed to map.png): https://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Political_map_of_the_World_(January_2015).svg/9444px-Political_map_of_the_World_(January_2015).svg.png

MATLAB commands used:

world=imread('map.png');
imshow(world)
exportgraphics(gcf,'world.pdf','ContentType','vector','Resolution',300)
#Texts in picture is blurry
print -dpdf 'world.pdf'
#Texts in picture is still blurry
exportfig(gcf, 'world.pdf', 'format','pdf','Resolution', 300,'Renderer', 'painters');
#this is a script from the MATLAB file exchange. Texts still blurry

CodePudding user response：

I managed to do it by importing pdfbox (java) and importing the image as a bufferedimage then creating a document with pdmodel.PDDocument then adding a page with a custom size using the bufferedimage.getWidth and same for length then I streamed the bufferedimage to the page and saved the document to a pdf file. The code is on my work PC if anyone is interested I will copy it here.