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Resizing images for web use is one of the main functions of image editing software
- even the most basic utilities will do this.
As discussed in Using a flatbed scanner, it is recommended
to scan images at a larger size and better quality than the final image, so scanned
images will generally need to be resized for web use.
In Photoshop the resizing tool is available via 'Image:image size'. It gives
the option to change pixel dimensions, document size and resolution, and the choice
to resample or not. Choosing not to resample the image will constrain the file
size (pixel size) of the image, while allowing adjustments to the document size/resolution
ratio. In some software this option is labelled 'constrain file size'.
It is also possible, within the 'Save for Web' settings, to resize your image
('Image size' tab).
In Fireworks the resizing tool is available via 'Modify:image size' and gives
the same options as Photoshop. Other image editors may have slightly different
ways of accessing this function
As discussed in Image resolution,
it is the pixel measurement that is critical to screen size, although you may
prefer to also use a 75ppi resolution to approximate screen resolution.
The 'cropping' tool is located in the toolbox (See EXAMPLE).
Clicking and dragging a rectangle selects the area to be saved. 'Canvas size'
in the menu performs a similar function, allowing you to key in the size required.
In some software, a 'scale tool' is available in the toolbox.
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