Is possible to keep the document size (printing size) and resize the image
and reduce the dpi at the same time?

e.g:
original image :
document size : 15 x 10 (inch)
resolution : 1024 x 768 (pixel)
dpi : 150 dpi

resized image :
document size : 15 x 10 (inch)
resolution : 800 x 600 (pixel)
dpi : 72 dpi

Can anyone share / advise the solution? Thank you in advanced.
Stanley

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