Resize Image
Click the Image | Resize Image command to change the pixel dimensions and resolution of an image.
Set the new image size and resolution in the Resize Image dialog.
Choose the Width and Height pixel settings for the resized image. The Pixel Dimensions indicate the number of pixels that are in the new image. The larger the number of pixels, the larger the image will be. Values should be between 10 and 32767 in both the Width and Height directions. To change the value, highlight the existing value and type a new value. When the box next to the Constrain Proportions option is checked, changing either the Width or the Height automatically changes the other dimension.
The Document Size section displays the Width and Height of the selected image in page units. When the box next to the Retain Document Size option is checked, the Width and Height are not available and show the original image size. When the box next to the Retain Document Size option is not checked, the Width and Height can be changed separately.
Choose the Resolution to increase or decrease the number of pixels in a page unit of the image being resized. If you choose to change the number, the Width and Height in the Pixel Dimensions changes automatically. The Resolution controls how fine the new image will appear. The larger the number, the larger the Pixel Dimensions will be.
Check the box next to the Constrain Proportions option to retain the original image pixel proportions. When checked, the new image will have the same height to width ratio as the original image, resulting in no stretching of the new image. When unchecked, the new image can have different Height and Width values, allowing the image to be stretched.
Check the box next to the Retain Document Size option to keep the original image size in page units. Uncheck the box to change the Document SIze Width and Height options. The Resolution can be changed under either condition and the pixel dimensions change accordingly.
The Resample Method controls how the image is resized. Available options are: Nearest Neighbor, Bilinear, Cardinal cubic spline, B-Spline, and BC-Spline. To change the method, click on the existing method and select the desired method from the list.
The Nearest Neighbor method locates the center of each new image cell and locates equivalent centers on the original image. The closest cell on the original image is assigned to the new image cell. When the original image and the new image differ in size, more than one original cell may be applied to the new image and some original image cells are not applied to the new image. The nearest neighbor method is the fastest resampling method, though it can result in distorted output if the original image and new images differ in size. This method is best for cells containing discrete data.
The Bilinear Interpolation method uses a weighted average of four cells in the original image and applies this to the new image. The new image is smoothed compared to the original image. This method is best for continuous data.
The Cardinal cubic spline method is a fast method to reduce sharp changes in the image. It often results in various degrees of blurring.
The B-Spline method uses a cubic spline method to emulate a Gaussian blurring filter. This is commonly used to produce a smooth flow though the control points. Typically, the B-Spline method creates various degrees of blurring in the new image.
The BC-Spline method is similar to the B-Spline method, but tends to produce sharper angles in the new image.
To return the image to the original state, click Reset.
Click OK to resize the image. Click Cancel to close the dialog without resizing the image.
See Also