Redimension Dialog Box

This dialog box is used to change the
dimensions and/or color depth of an image file that's already
open.
The width and height you specify are in pixels. You can choose
either 16-bit or 24-bit for color depth; 24-bit images take more
memory but are generally processed faster and are of higher
quality. Increasing an image's color depth cannot increase its
quality, of course, but future drawing operations will use the
higher quality.
- Preserve aspect ratio will make any change to one
dimension automatically change the other, such that the
width-to-height ratio remains the same.
- Scale existing image will cause the whole image to be
reduced or enlarged to fit in the new dimensions. If this
option is not selected, the right or bottom border of the
image is simply changedif the image is being
reduced, you will lose whatever image data was on the
right or on the bottom of the image; if the image is
being enlarged, the new space created at the right or
bottom of the image will be filled with black.
- When scaling an image, there's a certain loss of image
quality, especially if the image is being reduced in
size. Choosing "halftone scaling" will perform
a higher-quality blended scaling that increases the final
image quality.
When you redimension the image, the size of everything is
changed, including all frames of animation, the undo buffer and
any selected data.
There is no way to undo a redimension operation.