[Romans]

max3d wrote: Just load the image in Photoshop and change the dpi setting. No resampling needed. You'll just see the dimensions in cm/inches change.

Hello max3d

you pointed it out. The dimension depends on the resolution. But I dont want, that the dimension of the image will change. So, for (perhaps only) me, it would be great, if I could save a render with a fixed dimension and a certain resolution for that image-size. For me the resolution has a important relation with the image: a 72-dpi-image has a different quality than 300-dpi-one (with the same dimension).

Thanks for answering in any way.

Regards Roman

[Olivier Cugniet]

with the same dimension in cm/inches, yes but not in pixels... we're working in pixels, and every 3d software, so far i know, renders images in 72 dpi, but it depends on your pixels size.... don't know if it's clear

for example a A4 picture

72 dpi = 842 x 595 pixels
300 dpi = 3508 x 2479 pixels

[rivoli]

a 72-dpi-image has a different quality than 300-dpi-one (with the same dimension).

um, let's say we got a 1024x768 image, you can print it either at 300dpi, meaning the image will be printed out 8,67x6,5cm, or at 72dpi, meaning the image will be 36,12x27,09cm. it sure there's a difference but not in terms of pixels.
dpi means nothing to your renderer, and 72dpi is only the default dpi setting when ps (or any other editor) opens an image/rendering without dpi information.

[Romans]

Oliver wrote: with the same dimension in cm/inches, yes but not in pixels... we're working in pixels, and every 3d software, so far i know, renders images in 72 dpi, but it depends on your pixels size.... don't know if it's clear

for example a A4 picture

72 dpi = 842 x 595 pixels
300 dpi = 3508 x 2479 pixels

with other words: I would like to have the option to save the A4-picture with 3508 x 2479 pixels. Thanks for explanation.

Regards
Roman

[Mihai]

Just do a render 3508x2479. DPI is irrelevant unless you plan to print the image.

300dpi is really for highQ magazine prints. Usually you can print at 150dpi and still have very good quality. That will save you 4x render time since you would only need to render at half the size for the same size of printed image.

[Romans]

Thanks Mihai!


That is what I want: render smaller Images with higher pixel-count-output option. I want to avoid large renders.

Regards,
Roman

[Romans]

and yes Mihai, when you do visualization (architectural), often you need to print the results for presentation boards, booklets etc. You know that already.

Regards
Roman

[Mihai]

I don't think you understand Romans.

When you do a 3D render, it makes no sense to have a dpi option.

All that matters is how many pixels will make up an image.

To see if you understood, I'll ask you this question:

Which image is bigger on your screen, a 500x500 pixels image at 300dpi or a 500x500 pixels image at 72dpi?

Which would take longer to render?

[Romans]

the 72-dpi-one

[rivoli]

Which image is bigger on your screen, a 500x500 pixels image at 300dpi or a 500x500 pixels image at 72dpi?

hey, fair play mihai, that's a tricky one.

[Romans]

the render times are the same - I think it is a save-option

[KRZ]

if you want to print you should convert your image to cmyk anyway...so the use of something like photoshop is mandatory anyway. why not "resize" your large pic there?

[Olivier Cugniet]

Oliver wrote: with the same dimension in cm/inches, yes but not in pixels... we're working in pixels, and every 3d software, so far i know, renders images in 72 dpi, but it depends on your pixels size.... don't know if it's clear

for example a A4 picture

72 dpi = 842 x 595 pixels
300 dpi = 3508 x 2479 pixels

with other words: I would like to have the option to save the A4-picture with 3508 x 2479 pixels. Thanks for explanation.

Regards
Roman

render 3508 x 2479 pixels picture, open in photoshop, open image size, change 72dpi to 300dpi without resample, that's it

[Romans]

Thank you all for answering!

I will think and try a little bit the mensioned ways.

I only was thinking about how to avoid large renders - and for example - in 3ds max you have an dpi-option when you save your renderings (dont works with the maxwell-plugin). I thought tis could be possible in maxwell too...


Thanks again,

Roman

[Olivier Cugniet]

well if you want a perfect print for a A4 or A3 you can't avoid large renders. but maybe you don't need perfect print quality, so you can render half the size, and print 150dpi or resample your picture. I also saw some posts about resizing with PhotoZoomProfessional, but i didn't try it.