change dpi of the size

General Discussion Other

flodeux

in General Discussion • Other • 1 year ago

Hello!

I want to create a generativ program, who the result can be print (in a4).

I've a format problem : The A4 format in px is very bigest than all computer screen. I want to know if we can change the DPI of a size, for this reason (and because, if a .tiff is export from this program he can be directly to the good size for print)

I don't use PDF export because the process is big, and the pdf export will become to big for be print.

how can I change my program size in 225 dpi or more?

Thank you!

.Flo.

Replies(1)

maleo

Re: change dpi of the size

1 year ago

just create a drawing canvas that is large enough. it can be bigger than the screen. draw your stuff, then save to image with save("filename.tif"); if you wish, you can programmatically close the running sketch with exit() once you're done saving.

here is a code fragment you can use to convert your desired size in millimeters to pixels:

int ppi = 300; // pixels per inch
int width_mm = 210; // width in millimeters
int height_mm = 297; // height in millimeters
void setup() {
int w = mm2px(width_mm, ppi);
int h = mm2px(height_mm, ppi);
println(width_mm + " x " + height_mm + " mm");
println(w + " x " + h + " px");
size(w, h);
}
// convert millimeters to pixels, using the specified pixel density
int mm2px(float mm, float ppi) {
return ceil((mm / 25.4 * ppi));
}