Saving Powerpoint illustrations as high quality image files

[JimClark49]

mikef said:

Download GIMP and File -> Open

In the advanced Open options you can specify a suitably high dpi rate

Then save out as a JPEG with the least possible compression

Ok tried Gimp, but images are still poor quality (pixellated somewhat when zoomed in).
What specific values should put in for the following:
width
height
resolution

PS: when I try to increase the values and click open, the computer crashes!

[Mopar440]

JimClark49 said:

Saved as PDF and is very high resolution!

How are you measuring resolution? What makes you think that it is "very high resolution"?

Publishers don't expect you to be a professional graphic designer. So if you speak to them and explain the problem, they can advise you as to what you need to send them. Powerpoint presentations are the bane of the professional printer's world, so they can advise the best way to get a print-quality output from your application. They've had all this stuff before.

[mikef]

JimClark49 said:

What specific values should put in for the following:
width
height
resolution

That's actually a question for your journal publisher. For instance, if you were looking at a column-width illustration in Nature (3.5" half-page column) at 1200dpi you'd want a width of 4200 pixels. The height should adjust itself automatically in proportion.

If it's crashing it may be that you need more memory. I'm a Photoshop user, but just downloaded GIMP into a Win 10 VM with 8Gb memory and opening a PDF in GIMP at this res works fine.