To change the dimensions of an image

1Click Image ` Resample.

2Enable any of the following check boxes:

•Anti-alias — smooths the edges in the image

•Maintain aspect ratio — avoids distortion by maintaining the width-to-height

ratio of the image

3In the Image size area, type values in one of the following pairs of boxes:

•Width and Height — let you specify the image dimensions

•Width % and Height % — let you resize the image to a percentage of its

original size

When you change the dimensions of an image, you produce better results using width and height values that are factors of the original values. For example, reducing an image by 50 per cent produces a better-looking image than by reducing the size by 77 per cent. When reducing an image by 50 per cent, the application removes every other pixel; to reduce an image by 77 per cent, the application must remove pixels irregularly.

Changing image resolution

You can change the resolution of an image increase or decrease its file size. Resolution is measured by the number of dots per inch (dpi) when the image is printed. The resolution you choose depends on how the image is output. Typically, images created only for display on computer monitors are 96 or 72 dpi and images created for the World Wide Web are 72 dpi. Images created for printing on desktop printers are generally 150 dpi, while professionally printed images are usually 300 dpi, or higher.

Increasing resolution

Higher resolution images contain smaller and more densely packed pixels than lower resolution images. Upsampling increases the resolution of an image by adding more pixels per unit of measure. Image quality may be reduced because the new pixels are interpolated based on the colors of neighboring pixels; the original pixel information is simply spread out. You cannot use upsampling to create detail and subtle color gradations where none existed in the original image. When you increase image resolution, the image size increases on your screen; by default the image maintains its original size when printed.

394	CorelDRAW Graphics Suite 12 User Guide