How appropriate is it to develop a 6-inch photo puzzle?

The printer will automatically scale the oversized photos and the pixels will automatically decrease. If the length-width ratio is appropriate, it will be automatically cut. When printing photos, the printed photos are counted by points. If there are few pixels per unit size, the picture quality will be blurred. For printed photos, the set point density is 300dpi, that is, 300 dots per inch in the length and width direction. This point, corresponding to your digital photo, is a pixel, so it is more appropriate to calculate according to 300dpi.