Changing image size

You can change the 'size' of an image by scaling or resampling it. These can be undertaken independently or simultaneously.

Scaling

Scaling will embed a specific print resolution into an image's metadata to force it to print at a specific dpi (e.g. 300 dpi). The image's pixel dimensions remain unaffected.

Resampling

Resampling will do one of the following:

Increase the number of pixels in an image (i.e stretch it) to make its overall pixel dimensions bigger. This is known as upsampling. This will also increase the image's file size.
Decrease the number of pixels in an image (i.e compress it) to make its overall pixel dimensions smaller. This is known as downsampling. This will also decrease the image's file size.

When you resample an image, you have the option to:

Maintain the image's aspect ratio or resize unconstrained.
Select from a variety of interpolation methods (see note below).
Simultaneously scale your image.

Resampling may be carried out to:

Enlarge an image to specific dimensions in preparation for printing.
Reduce an image for on-screen display and to optimise file size.

To scale an image:

From the Document menu, select Resize Document.
Ensure the Resample option is switched off.
Change the DPI to control the number of pixels (dots) which will be printed per inch when your document is printed. Set higher values (e.g., 300dpi) for professional printing.
Click Resize.

You will see no change in the image on the page as this procedure only affects the image's metadata.

To resample an image:

From the Document menu, select Resize Document.
Ensure the Resample option is switched on.
Enter your new document dimensions in the Size boxes—left box for width, right box for height.
- To resize the width and height independently, click the lock icon (to unlock) between the Size boxes.
(Optional) Select a different measurement unit from the Units pop-up menu. Rulers will update to the new measurement unit.
Change the DPI to control the number of pixels (dots) which will be printed per inch when your document is printed. Set higher values (e.g., 300dpi) for professional printing.
Select a Resample method from the pop-up menu.
Click Resize.

Scaling

Resampling

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