Graphics Programs Reference
In-Depth Information
Upscaling a low-resolution image
Low-resolution images are fine—even desirable—for web pages and social media.
If you need to enlarge them, though, they may not contain enough information for
high-quality printing. To scale an image up in size, Photoshop needs to resample
it. That is, it needs to create new pixels where none existed, approximating their
values. The Preserve Details (Enlargement) algorithm in Photoshop gives the best
results when you upscale low-resolution images.
In your movie poster, you want to use a low-resolution image that was posted on
a social media site. You'll need to resize it without compromising quality for your
printed poster.
1.
Choose File > Open, navigate to the Lesson09 folder, and open the
Faces.jpg file.
2.
Zoom in to 300%, so you can see the pixels.
3.
Choose Image > Image Size.
4.
Change the width and height measurements to Percent, and then change
their values to
400
%.
The width and height are linked by default, so that images resize proportionally.
If you need to change the width and height separately for a project, click the link
icon to unlink the values.
5.
Pan in the preview window so that you can see the glasses.
6.
Make sure Resample is selected, and choose Preserve Details (Enlarge-
ment) from the Resample menu.
The image is much sharper, but the sharpening has introduced some noise.
7.
Move the Reduce Noise slider to
50
% to smooth the image.
