Resampling image

Resampling image

Resampling is used to resize an image by modifying its resolution or size in pixels.
An image can be resampled in the three following ways: by changing the image size in pixels, by changing the actual image size with fixing size in pixels, and by changing the actual image size without fixing size in pixels.
 Note that an image resolution cannot be modified without appropriately changing its size. An image file size is proportional to its squared resolution. For example, an image file with resolution of 200 pixels per inch is four times larger, than file containing an image of the same size (in inches, for example) and a resolution of 100 pixels per inch.
The operation can only be applied to one image at a time.

To resample an image

Select an image and start the operation by choosing the Resample command from the Image menu.

The following dialog box appears:

1. Set the Fixed size in pixels checkbox to save the original image size in pixels,
- or -
Clear the Fixed size in pixels checkbox to modify the image size by adding or deleting the image pixels.
2. Choose measurement units from the list:
3. Type in the Width or Height boxes the new image width or height. (If pixels are chosen as the measurement units and the Fixed Size in Pixels option is on, then these values cannot be entered into Width and Height). When entering any value in one box, the value in the other box is changed automatically in order to maintain the image proportion.
- or -
Type a scale factor in percent based on the current image size in Scale.
If the Fixed Size in Pixels option is on, then the setting of a new actual size influences the resolution value. The image size in pixels is constant.
If the Fixed Size in Pixels is off, then the setting of a new actual size influences the size in pixels. The image resolution is constant.
4. Change the image resolution by entering a desired value in dots per inch (DPI) in Resolution.
If the Fixed Size in Pixels option is on, then the actual size is changed and the size in pixels remains the same.
If the Fixed Size in Pixels is off, then the actual size remains the same and the size in pixels is changed.
5. Click OK.