Blurry PDF thumbnail

[doherty]

When I create a thumbnail of this PDF, I get the PNG attached, which is utterly inadequate. The command line used was:

Code: Select all

convert in.pdf -thumbnail 1000x1000 out.png

Bah, I don't think I can attach files D:

Well, the PDF in question was https://minus.com/mike-cards#6 - and you can see the thumbnail that got generated for it. Compare by downloading the actual PDF file.

[fmw42]

try

convert -density 150 in.pdf -thumbnail 1000x1000 out.png

or if that does not work adequately increase the density.

[doherty]

Thank you for the suggestion. I assumed it'd choose the right density for the thumbnail size.

I had to increase the density way up to get a decent thumbnail. But, that'll do! Thanks again.

[tedanoell]

How to choose the right density for a thumbnail?

[anthony]

Depends on the input.

PDF's are vector images, but even so are often designed for much higher viewing resolution (printed page) than the default (screen) point resolution.

Their is no way IM can know what is an acceptable density for a specific PDF or Postscript image.