OTOY Forums

In case of DPI - the easiest way to understand it is:

pixels are pixels - they don't change.
DPI is only a print or screen interpretation of pixels. So it's about how many of them show up on how big field.

Having this knowledge we should be able to interpret it in any direction.

However Photoshop messes things up. When user is changing DPI of image it changes pixel count as well - what is not what should happen and what drives people into misunderstandings.

My way in Photoshop to change DPI count is:
- Ctrl+Alt+I
- keep aspect ratio turned on
- copy long/short side pixel dimension
- change DPI
- paste pixel dimension back where it was.

done and done.

slepy8 wrote:
My way in Photoshop to change DPI count is:
- Ctrl+Alt+I
- keep aspect ratio turned on
- copy long/short side pixel dimension
- change DPI
- paste pixel dimension back where it was.

Couldn't you just uncheck "resample image" in the image size dialog?

dionysiusmarquis wrote: Couldn't you just uncheck "resample image" in the image size dialog?

in fact yes, you can. You don't see the pixel count cause it's not available but yes - that's the method too.

sorry for opening old post, but I just found this script for 3ds max (which I remembered from before)
- so you press A4 - it bumps up your resolution to 2480x3507

for future reference http://www.homme3d.com/2011/01/set-prin ... ax-script/

- the DPI thing is actually half bullshite, and I also had arguments with people about how the only setting I need is the pixel dimensions and they argue how I don't understand, you need 300 dpi, and just do it, so I ask, at what resolution, 300 dpi, then again I ask the resolution in pixels, then again I get the answer, it doesn't matter it has to be 300 dpi - then I think to myself "Ok, go die from stupidity"

- what people actually mean is "I want to print it out on A4 so it looks good" / or B1 or 3x5 meters (where you can go with 100 dpi because it doesn't matter - you are not going to stand 5 cm from the print to look at it (I actually had one render printed on 3.5x1x8m - at 8000 pixel wide resolution, because it was the maximum, and it looks great)

- there is a lot of confusion about this, because people don't understand the correlation between DPI and pixel dimensions, it is like you tell someone do this in 1000x2000 in 300 dpi / it does not compute
- also A4 in 200 DPI prints out pretty much perfect, I had a lot of renders just streched to fit my 1920x1200 monitor, and then I send them out, they printed out great / so..

- bottom line
A4 in 300 DPI = 2480x3507 px
B1 in 300 DPI = 8350 x 11811 px

the rest>
http://www.all-size-paper.com/B1/b1-paper-size.php