Image Processing Reference
Make sure the chain icon near the resolution settings is closed and that
the X and Y resolutions are equal (see Figure 2.24 ).
The next step is to set the image size (measured in pixels, inches,
millimeters, etc.). In the upper part of the window, you will see two values:
Width and Height . You want to use inches as your size unit. To set inches as
the measurement unit, click the arrow next to the Pixel/in field (to the right
of the Height field) and select inches . Then type the number 7 for the value in
the Height field. Press Enter to accept your changes. The value for the width
should now be 5.25.
The Scale Image window
Now choose the interpolation quality (pixel recalculation). Set
Interpolation to Sinc (Lanczos3) in the Quality section of the Scale Image
window. Confirm the settings by clicking the Scale button. The program now
computes the new image size; this also may change the size of the image in
the display. To see the entire image in the display, you have a variety of tools to
choose from. But first I would like to give you some more information on the
relation of resolution and size.
Try it out if you are not sure what you should choose. The results can vary
from image to image.