Resize Image
As noted in section Suggested Workflow of this Guide, large
files are not needed to create great looking fine art, thus the Resize
Image icon, (to the right of the Crop button), that looks like this, ,is there to help keep the file sizes under control.
PC
Mac
In the screen-grab above the original photo was much larger but it has been resized to 1307 x 1409, which, if printed at 180dpi, will definitely look good on A4, and more than acceptable on A3.
To resize an image to specific dimensions use the Custom Size option and key-in the required number of pixels - and to ensure the aspect ratio of the image is consistent, do not uncheck the Constrain Proportions option.
Note: If the area of your image is larger than 12 Megapixels
then a warning sign, appears next to the Resize Image icon.