98 Macworld • December 2019FEATURE
an interactive export dialog that previews an image
as you adjust settings for quality and resolution,
including the estimated resulting file size in bytes.)
If you started with a lower-quality JPEG,
exporting it as High or Maximum won’t magically
make it more detailed – the original fidelity is
lost. But if your original file is a Raw image (which
captures raw sensor information from a camera)
or was created as a high-quality JPEG, you should
consider High or Maximum when exporting if you’re
trying to produce a new image close to the original.
For all the image export formats, you can
pick resolution from the Size menu. Full Size
preserves the resolution of the imported image.
The smaller sizes are appropriate typically for
low-throughput situations – like a low-speed cell
or Wi-Fi network – or ones in which data transfer
is expensive or limited.
If you have a particular resolution target for an
image, you can also pick Custom from the Size
menu and set the maximum height or width, or
the maximum dimension of either height or width.
That’s useful if you were given a target size for an
image that will be placed on a web page or used in
a layout for digital or offset printing.