Page 19 - Adobe Photoshop CC 2020

9. Change the Resolution field to 300 pixels/inch.
When you change resolution with resampling turned on, you do not change the file’s
physical size. To achieve 300-ppi resolution at the new size, Photoshop needs to add a
huge number of pixels to the image. You can see at the top of the dialog box that this
change would increase the number of pixels from 4943 × 3300 to 20596 × 13750.
You can also see that changing the
resolution of an image without affecting
its physical dimensions would have When Resample is
a significant impact on the file size. checked, changing the
Changing the resolution to 300 ppi at the Resolution value adds
current size would increase the file size to or removes pixels.
over 810 megabytes.

Higher resolution means larger file sizes,
which translates to longer processing time
for printing, or longer download time over the Internet. When you scale an image
to a smaller size, simply resizing can produce files with far greater effective resolution
than you need. Resampling allows you to reduce physical size without increasing the
resolution, resulting in a smaller file size.

The caveat is that once you delete pixels, they are gone. If you later try to re-enlarge the
smaller image, you will not achieve the same quality as the original file before it was
reduced. You should save reduced images as copies instead of overwriting the originals.
10. Press Option/Alt and click the
Reset button to restore the original
image dimensions in the dialog box.
In many Photoshop dialog boxes, pressing
the Option/Alt key changes the Cancel Pressing Option/Alt
button to Reset. You can click the Reset changes the Cancel
button to restore the original values that button to Reset.
existed when you opened the dialog box.

11. Uncheck the Resample option at the bottom of the dialog box.

12. Change the Resolution field to 300 pixels/inch.
Resizing without resampling basically
means distributing the same number of
pixels over a different amount of physical When the Resample
space. When you resize an image without option is unchecked,
resampling, you do not change the number these three fields are
of pixels in the image. In fact, those fields all linked.
in the dialog box become simple text;
the fields are unavailable and you cannot
change the number of pixels in the image.

You can see how changing one of the linked fields (Resolution) directly affects the
other linked fields (Width and Height). By resizing the image to be 300 ppi —
enough for most commercial print quality — you now have an image that is
approximately 16.5″ × 11″.

Project 1: Music CD Artwork 31