Exports the active image layer as an image file.
Exporting an image or mask layer exports a file of the same pixel dimensions as the image plane. To see the image plane’s dimensions, choose Edit > Sketch Properties from the Paint Layer Editor.
Export Image/Mask Layer Options
When this option is checked, two sliders appear to adjust the Horizontal and Vertical size of the image in pixels. The sliders initially represent the maximum dimensions of the image. If the image exceeds either the horizontal of vertical maximum, it is scaled down, while preserving the aspect ratio, to fit within the specified dimensions.