Compositing Technique

Importing the Correct Size Image into Your Picture

Clive R. Haynes FRPS

Importing an image of incorrect size (too large or too small) is undesirable, as significant re-sizing will corrupt details. It’s much better to import the image at the size you need. This is how.
1 Use the rectangular marquee tool to define the size of the area into which the new image is to be brought. This will establish the size of the image you wish to ‘paste’.
2 Look at the ‘Info tab’ (in the Navigator palette of options) and note the ‘W’ and ‘H’ sizes
3 Go to Image > Image Size and note the Resolution, expressed in Pixels Per Inch (or cm if you prefer). This is the size of file (Mb) that you will need to import containing the new, scanned image.
4 Go to File > New and create a new document. Its called ‘New’.
5 Make certain that the Resolution is identical to the image you’re working on. If it isn’t then change it (simply type in the correct figure).
6 Enter the Width (W) and Height (H) as per the Info Box figures (W &H) from the image you’re working on.
7 Note the File Size - this will be used in a few moments Close the 'New' file – it only served as a reference to discover the file size required.
8 Go to your scanner and adjust the marquee around the area of the image you wish to import (try to keep the proportions similar to the area you intend it for).
9 Set the scanner Resolution to the same as the destination image (see step 3).
10 Adjust the scanner to give the same or slightly larger file size (in Mb) to that required – noted from step 7.
Do this by altering the percentage setting or the resolution setting (a series of guesses until about right) for the scan or by typing in the file size (Mb) required, however not all scanner software will give this latter option. If in doubt always opt for a slightly greater file size, as re-sizing downwards is not such a problem. All that you are aiming for is the correct file size in Mb.
11 Scan in the usual way. If necessary, rotate the image so it’s the right way around.
With both 'windows' visible (that is destination/original image and imported image) use the ‘Move’ tool in Photoshop (arrow icon, top right of Tool Box) ‘drag and drop’ the newly scanned image into the picture area. Lo and behold, the image you have just imported is the correct size – or very close. And it appears on a separate layer.
Make any further size adjustments, if required, via the Edit ‘Transform’ menu.