DPI question

[only3d]

Hi to u all

 

ive recently encountered a problem which i thought of theoretically but only now complicated me.

 

my recent client asked me to render a 40/30cm in 300dpi to fit his 300dpi poster. the default dpi in max is 72 as u know but when i change the dpi using max's print wizard it actuallly reduces the size of the final rendering.

meaning if before in 72dpi i rendered a 1200/900px to get a 40/30cm print

in 300dpi i get a 10/7.5cm print.

 

so what is the correct way to increase the dpi? is it possible at all?

[JamesTaylor]

you need to render to an image size of 4724 x 3543 pixels to achieve 40 x 30cm image at 300 dpi

[only3d]

well i kinda figured it out after i wrote the question here

it will take me ages to render at this resolution but tnx anyway

 

do u think theres a difference in printing at all? i mean 72 or 300?

im trying to explain it to my client that 300 dpi is excessive and useless unless the printers can print at such quality but id like a 2nd opinion

[EricMLevy]

I work at an Arch firm in Philly. We do large prints all the time. Yes, there is a big difference between 72 and 300dpi. Due to time constraints we often render for 150dpi and scale up. 300dpi is certainly sharper than 150, but if there's a deadline, you have to make due.

[Sawyer]

Also keep in mind the size and how you will look at it. Small prints are held in your hand and you can really tell the difference because its right there in your hand. Larger prints are usually on the wall and you stand back to look at them the dots are farther away and you loose the benifit of a dense image.

[AJLynn]

When rendering in Max, the DPI and size in inches/cm is almost totally irrelevent - it only matters inasmuch as it help you figure out the size in pixels, which is the only important thing at this stage. The PPI set to the printer will be determined later by the software that does the printing. What you need to do is convert each dimension from cm to inches (divide by 2.54) then multiply by the PPI (in this case 300) to get the number in pixels.

[STRAT]

300 dpi is quite standard to proffessional A4 and A3 printing. it's not too large atall.