How to Produce Physical Dimension of an Image drawn using Java

问题

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

回答1:

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

回答2:

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