58 | CorelDRAW Graphics Suite X6 Guidebook
If you need to straighten photos that were
taken or scanned at an angle, you can use the
Straighten image dialog box (Adjust `
Straighten image).
Top: The Straighten image dialog box displays a
crooked image. Bottom: The image has been
straightened.
Changing image size and
resolution
The term “image size” often refers to the pixel
dimensions — that is, to the image’s height
and width expressed in pixels. Image resolution
refers to the number of pixels per inch (ppi)
within an image. The pixels-per-inch
measurement corresponds to dots per inch
(dpi) in discussions of printing or scanning.
Note that the image size in pixels differs from
file size, which is measured in kilobytes (KB),
megabytes (MB), or gigabytes (GB).
Image resolution determines how sharp and
detailed an image is when it is displayed on a
monitor or printed. The resolution you choose
depends on how the image is output. Typically,
images that are created for display on
computer monitors or for the Web are 96 or
72 dpi. Images that are intended to be printed
on desktop printers are usually 150 dpi,
whereas professionally printed images are
usually 300 dpi or higher.Resolution of 72 dpi (left) and 300 dpi (right)The image size (pixel dimensions) and
resolution determine the amount of image
data in a file. The more pixels an image
contains, the higher its quality. However, a
larger image produces a larger file. Often, you
must adjust the image size or resolution to
optimize image quality while keeping the file
size manageable.Increasing image resolution for print
Images that are intended for print need to have
a high image resolution. To prepare a photo
taken with a digital camera for print, you need
to maintain the original file size (the number of
pixels) and increase the resolution (the number
of pixels per inch) to at least 300 dpi. This
method decreases the width and height of the
image and creates a better printed result.
Alternatively, you can specify a smaller width
and height, which automatically increases the
resolution values.You can increase the image resolution in
the Resample dialog box (Image `
Resample).