How can I change the DPI/size of a PDF or create it at that?

Forum|Forum|5 years ago
February 27, 2020
3 replies
4699 views

I have a PNG measuring 6000x4500 pixels and I want to print it at 300 DPI so that would make it exactly 20" x 15".

When I create a PDF out of it there's no option to change the DPI value, it's always 72, which creates the PDF at 83.33" x 62.50".

Is there a way to either create it at 300 DPI from the start or resize it to 20" x 15"?

Thank you!

JR Boulay

Community Expert

The size of the PDF don't matter, you just have to scale it to 20x15 when printing.

Acrobate du PDF, InDesigner et Photoshopographe

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WuktrioAuthor

Participating Frequently

I know, I can simply print it at 24% to make it exactly 20x15, but I wanted to know if it's possible to change that so I can print at 100%.

Dov Isaacs

Legend

To properly prepare a PDF file of a raster image and get the size, resolution, and color space correct, you would be best off to open the image in Photoshop or equivalent and perform the resizing in that software, saving the results as a PDF file.

- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)

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WuktrioAuthor

Participating Frequently

Thank you, but now I have another question:

I thought PPI was not a value for images? Isn't PPI only for printing if you know which dimensions you want to print the image in?

Dov Isaacs

Legend

Resolution (PPI) is effectively metadata that accompanies many if not most images. It is useful to determine what is the actual size that the image will either print at or place at (such as in InDesign, Illustrator, or even Word) without further manipulation either at print time or when placing the content.

- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)

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Test Screen Name

Legend

With Acrobat it uses only the resolution (ppi) in the file itself. To make it another size you need to use another app. Photoshop if you have it.