I have drawn a square on JPanel in Swing Applet.now i want to print this square having physical dimension 50cm * 50 cm on to paper.it means the print measurement of the square is 50 * 50 cm in real world which i drawn on to panel of an applet .the printer uses 400 DPI to print.
so how can i relate these to measurements ? in which file format i should save my drawing so it will have accurate measurement while printing , equals to printer DPI and quality of the image is maintained in print.
Thank You Mihir Parekh
You need to convert you centimeter value to inches, so you can obtain the Dots Per Inch
1 cm = 0.393700787 inches
50 cm * 0.393700787 inches = 19.68503935 inches
19.68503935 * 400 = 7874.01574 pixels
50cm with 400 DPI are: 50/2,54*400 = 7874 Pixels I recommend png or gif (gif only for <= 255 colors)
来源：https://stackoverflow.com/questions/13993692/how-to-produce-physical-dimension-of-an-image-drawn-using-java