render resolution can't be more than 96 dpi

[black.abbath]

hello. as i see, Arnold's dot density while rendering can't be more than 96 dpi. tried different: 150dpi, 300dpi - no luck and it's limited to 96 (picture properties shows 96dpi).

i want to ask developers why such limit: is it a persistent bug or a license restriction?

same time vray and keyshot has no restrictions; you can set and GET much higher dpi resolution. thanks

[Stephen.Blair]

Arnold has x and y resolution, and pixel_aspect_ratio.
Those are not driven by the dpi parameter in the render settings.

[black.abbath]

need an answer concerning DPI (not about screen resolution)

[Christoph_Schaedl]

Dpi is only relevant for print. Just render a bigger image.

[black.abbath]

thanks for response, Stephen, did you read the text? need an answer concerning DPI (not about screen resolution)

[black.abbath]

yes, you are right, Chris. it's for printing. and i need exactly DPI solution or answer why it can't be rendered more than 96 dpi (bug or license limit/restriction); meanwhile other renderers has no such limitation.

[CiroCardoso3v]

Probably isn't going to help, but in 3ds Max we have a tool like this

This calculates how bigger an image need to be to get to DPI you need. The correct resolution is determined simply by the size you want to print at, multiplied by the number of dots (pixels) you want each square inch to have.

[black.abbath]

it's possible workaround, thanks.

but need exact dpi result - to enter exact dpi value and get exact file property without additional manipulation and dances with tambourine.

i don't understand why this issue still not resolved after 3 years it's published here.

do people who pay for this renderer has same issue?

[adrien.herubel]

I checked and Arnold does not currently set the DPI metadata on tiff images, which is causing Photoshop to treat them as 72dpi. I am guessing that it could depend on the image format, what was the format you used to get a 96dpi default density ?

Is the feature request to be able to set the DPI metadata on output images, or to be able to choose the resolution using width/height/pixel density, as you would in Photoshop for example ?

Arnold does come with a small command line utility called oiiotool.exe which enables you to set the DPI metadata :

oiiotool.exe 72dpi.tif --attrib:type=float XResolution 144 --attrib:type=float YResolution 144 -o 144dpi.tif

[black.abbath]

Adrien, i tried jpg, png and tiff - all of those were rendered with 150 dpi, but output is at 96 dpi.

request for both: correct metadata and correct dpi density.

what's the problem to fix arnold output attributes to correct?

[CiroCardoso3v]

Doesn't this fix the issue?

https://knowledge.autodesk.com/support/maya/troubleshooting/caas/sfdcarticles/sfdcarticles/Images-re...

DPI value of file formats is only a 'label' at the files, which has nothing to do with the content of the files itself and is only useful where a software automatically scales images in a print context

[black.abbath]

thanks for the link.

once more: what's the problem then to make Arnold write metadata correctly; force it to work correct without any further manipulation? 🙂 it looks like an obvious bug.

when i'm using Keyshot, for example - i'm getting 72, 150, 300, 600 dpi without dances with tambourines and without finding a workaround.

[adrien.herubel]

Thank you for reporting the issue. The feature request is now tracked internally (ticket number #10347)

[black.abbath]

wow! that's the answer i love to see. thanks a lot!

can you please gimme a link where i can track this ticket progress?

[pixelpusherU28Y9]

3DS Max is not "Photoshop", that's clear to industry people. You're computer OS is either a Mac (72 dpi) or Linux/Windows (96 dpi). If you take a render (using 3DS Max) that is 4096 × 2048 pixels and open it in GIMP, Photoshop, et al. you will be able to make the image any print resolution you wish (max. recommended 300 dpi for print). Everyone who works in multi-media or DTP should know this basic stuff.

Your response to previous replies demonstrates clearly that you're new to this, so maybe have a little more patients and better understand what you are doing. Try some research first before asking some one to feed you, "learn to fish" is my advice.

[hyperviktor]

You keep repeating yourself and seems like you have no clue at all about what DPI is. It's a reference number for printing, so depending on it, your printed image will have a different size on paper. It does not change the size of the image. It shouldn't at all.

You define an image by it's x and y pixel resolution. Then you tell the printer how many pixels you want of those in one inch printed. 

Now, if you know what you want , you can just enter a resolution based on your required size in cm/inches x desired DPI and you have your resolution.

Mind you, DPI can be changed without changing the size of an image.

On top of all this, no one on this planet printed any raw render directly because they all need a **** ton of post processing anyways, so what the hell are you whining about anyways ?

And yes, arnold is for film and VFX mostly, not for print but the solution is so simple ( and assumes you understand what is DPI ) that no one would think it needs to be implemented.