Advanced Techniques - Adobe Photoshop Elements 11 for Photographers - page 250

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With the Resample Image option selected, it is possible to
increase and decrease the total number of pixels in your image.
(1) Resample Image option ticked. (2) New pixel dimensions. (3)
New document size.

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Upsizing and downsizing
This said, in some circumstances it is necessary to increase or decrease the number of
pixels in an image. Both these actions will produce results that have less quality than if the
pictures were scanned or photographed at precisely the desired size at the time of capture. If
you are confronted with a situation where you are unable to recapture your pictures, then
Elements can increase or decrease the image's pixel dimensions. Each of these steps requires
the program to interpolate, or 'make up', the pixels that form the resized image. To increase
the pixels or upsize the image, tick the Resample Image check box and then increase the
value of any of the dimension settings in the dialog. To decrease the pixels or downsize the
image, decrease the value of the dimension settings.

Image Size dialog settings
To keep the ratio of width and height of the new image the same as the original, tick the
Constrain Proportions check box.

Interpolation quality and speed are determined by the options in the drop-down menu next
to the Resample Image check box. Bicubic is the generally best setting for photographic im-
ages, but Bicubic Smoother should be used when increasing the number of pixels in a photo
and Bicubic Sharper when reducing a photo's size.

Resizing workflow:
1 Select Image Size from the Resize option under the Image menu.
2 Tick the Resample Image check box for changes to the pixel dimensions of your
image.
3 Uncheck the Resample Image option for changing image resolution.
4 Adjust the dimension settings to suit your output requirements.