Final answer:
To reduce file sizes when working with layers, you can adjust the resolution and compression of the image. Lowering the resolution and applying compression will decrease file size, but care should be taken to not overly degrade image quality.
Step-by-step explanation:
When you work with layers in digital images, there are various techniques to help reduce file sizes. These techniques involve adjusting the resolution and compression settings. Resolution refers to the number of pixels used in an image; reducing the resolution can lead to a smaller file size but also to potential loss of detail if not done carefully. Compression works by comparing nearby pixels and discarding similar colors, which decreases file size but can also diminish image quality.
You can manage these settings straight from your digital camera by choosing the appropriate resolution and compression combination to suit your end use, whether for print or screen display. Alternatively, shoot with high resolution and no compression for the best quality, then use editing software to adjust and compress as needed later on. Remember, more compression results in a smaller file but might impact the visual quality of the photo.