How do I change image resolution to 72 ppi the length pixels going lower than 1920 pixels

Hello,
I have an image that is 2550px x 3300px with a resolution of 300. I would like to change this to a web jpeg with a resolution of 72ppi without changed the length resolution to less than 1920. Everytime I try changing the resolution to 72 ppi it changes the size to less than the 1920 px size needed.
Thank you,Jan

An image has some pixels real information these make up the bulk of any image format file size. DPI is a resolution setting that defines what the size of a pixel is. Pixels have no size till there is a resolution specified. your 2550px x 3300px resolution can be set to 72 not a single pixel will change only the size of the image will. A device that honors resolution will now render the image 35.4" x 45.8" instead of the old 300 setting which would render the image 8.5" x 11" This is how Image size works when resample is not checked. If you check Resampel the number of pixels an image has will change. You will wind up with a new image with a different number of pixels interpolated the the old image that will no longer exist not a single pixel remains of the old image. So if you open image size on your image you will see 8.5"x11" at 300DPI.
Check resample change to pixels and change 3300 to 1920 you will see Photoshop set the width to 1484 px. and the resolution be 300DPI.
Open the image dialog again. Un-check resample and you will see Photoshop change the width and height to 4.947"x6.4" now change the 300 DPI to 72 DPI you will see Photoshop change the width and height to 20.611" x 26.667" the pixesl will remain 1484px x 1920px. This is how image size works.

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Date: Mon, 17 Aug 2009 16:04:16 -0600
From: [email protected]
To: [email protected]
Subject: how do you change image size in the title window?
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>

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