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This a complicated question :)
when you change DPI you only change number of pixels per Centimeter or Inch, but absolutely you change the display size of image over your screen, this is a different factor of scaling.
for screens actual pixels resolution is72 pixels per inch, if you resize more or less your display will map you image to fit the same size. obviously you can virtually zoom in and zoom out but there is a fitting size for your actual image size.
So when you change DPI you don not change printing size but you force the change of display size.
Load your image into Adobe Photoshop (or Photoshop Elements).
2. Select the "Image > Image Size" menu option (may be "Image > Resize > Image Size" in Photoshop Elements).
3. In the image size dialog window, deselect the "Resample Image" checkbox (make sure there is no checkmark in that box).
4. In the "Resolution" box type in300 (or whatever DPI you want)
5. Click the "OK" button
6. Your image DPI has now been set to whatever you want (leaving the pixel dimensions of the image unchanged).
7. Save this photo with a new name - I suggest adding a -300dpi extender (i.e. "dpi.jpg") to identify this new DPI image.
8. See note below when saving to JPEG format
go to image size option, turn off the constraint proportion and change dpi
Image> Image Size> Set Re sample Unchecked, Change Resolution to desired DPI.
But Increasing Resolution may not help in actual pixel increasing, Depending on the actual image quality, depth of colors and pixels. but reducing DPI helpful for decreasing file size for digital print or for online publishing.
select image > press ctrl+shift+I >resolution
changing DPI is different than changing the Project Scale over all, with increasing or decreasing the number of the pixels per inch\\centimeter we will have more effecint image -from the menu bar:-IMage->Image Size-at the Image size window turn off the "Resample" option -then change the DPI as you want.
You can change in image size at image menu. change the resolution.
you can click on the littel gear-look in the upper right of the "image size" dialogue box, you will find "scale styles" option, it allows you to change resolution without change the size of the image
By checking the 'resample' button in the image size window.
By changing the resolution on Image Size (cmd+alt+i)
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