Change resolution without changing quality of image?

i have photos at 72 resolution i need to change to 300 for a banner can i do this without changing the quality of photo
thanks
chuck

Maybe. Maybe not.
You can certainly change the PPI of an image to any number you want with no change at all the the image. Just go Image>Image Size and UNCHECK Resample Image. You can now type in any PPI, the only thing that will change will be the printed size of your image.
Do this and see what size the image will print at 300 PPI. You may need to upsample to get it to a desired printed dimension of the banner. (To upsample will need to check Resample Image and type in desired PPI and print size). Resampling will change your image by adding or subtracting pixels.

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