The usual print shop's dpi is set to 300, and the quality of drawing with this standard is very good.

The size of a credit card is usually about 8.6X5.4cm, and in English it is 3.4X2. 1 inch.

The required picture resolution (dpi300) is 1020X630, which means that 1020X630 is the resolution required for credit card printing.

For the resolutions of 1024*768, 1028*720, 2592* 1944, 3072*2048, you can use the light and shadow magic hand (software) for cutting. When cutting, pay attention to the resolution as far as possible not to be lower than 1020X630, which is of course worse than the previous one.

Just save the cutting diagram and print it out.

For other small pictures, when the dpi is reduced to 250, the resolution required for printing is 850X525.

Only 768X5 12 is barely available, and there is nothing else to do.

Note that the light and shadow magician has a zoom function, which can be used to enlarge when the resolution is not enough (the difference is not big).