Scream of the Crop: How to Resize and Crop Photos - The Adobe Photoshop CC - page 256

Making Your Photos Smaller (Downsizing)
There's a different set of rules we use for maintaining as much quality as possible when
making an image smaller, and there are a few different ways to do just that (we'll cover the
two main ones here). Luckily, maintaining image quality is much easier when sizing down
than when scaling up (in fact, photos often look dramatically better—and sharper—when
scaled down, especially if you follow these guidelines).
Downsizing photos where the resolution is already 300 ppi:
Although earlier we discussed how to change image size if your digital camera gives you
72-ppi images with large physical dimensions (like 24x42" deep), what do you do if your
camera gives you 300-ppi images at smaller physical dimensions (like 12x8" at 300 ppi)?
Basically, you turn on the Resample checkbox (in the Image Size dialog under the Image
menu), then simply type in the desired size (in this example, we want a 6x4" final image
size), and click OK (don't change the Resolution setting, just click OK). The image will be
scaled down to size, and the resolution will remain at 300 ppi. IMPORTANT: When you
scale down using this method, it's likely that the image will soften a little bit, so after scal-