With resample not checked that is all that will change. Tne Images pixels remain the same so will the file size. All that changes the the pixels size that the image will be printed with. The print will be much smaller when 300DPI size pixels are use. The image size will not change on displays.
The image will be more 30cm x 17cm at 300DPI 60cm by 20cm is a 3:1 aspect ratio. to do the size print you would need to crop off some pixel. That a very wide aspect ratio. You would change the composition quite a bit with a crop like that.
Your Print resolution would be more like 150DPI...
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You have an image that is 3554 pixels wide.
To find out how wide you can print it, divide 3554 with 300, and you get 11.85 inches, which converted to cm is 30. (multiply by 2.54)
This means that you can print the image 30 cm wide at 300 ppi.
It also means that you can print the image 60 cm wide at 150 ppi.
To be able to print the image 60 cm wide at 300 ppi, you need to start out with an image that's 7087 pixels on the long side.
If you use the image size dialog to change the ppi to 300 with Resample checked, Photoshop will invent the missing pixels, but the result may not be acceptable, since 3/4 of the pixels in the image will have to be invented.
Thanks for helping, everyone. Just got my answers!
Very helpful. Thanks a lot.
Thanks a lot. Very helpful, JJMacck