Putput DPI question

crojack · Post by **crojack** » Tue Feb 05, 2008 5:44 am

So, I noticed that when I bring in an image to PS, either the png that Indigo saves or one out of Violet, that it comes into PS at 72dpi. I know that that is the only size sketchup will output an image at, is that why the Indigo image is 72dpi? Doesn't seem like it should be limited to 72dpi. I ask because a lot of the stuff I render needs to be printed and having a higher dpi would be nice, even 150. I know that rendering huge and reducing the image size does a similar thing, but doesn't it take longer to render a much larger image?

dougal2 · Post by **dougal2** » Tue Feb 05, 2008 5:51 am

Well, it depends on the size you want to print or display.

if you want a 24"x12" print at 150dpi, you must render at 3600x1800.

There's no way around it. If you want large prints at high dpi, the render size goes way up.

crojack · Post by **crojack** » Tue Feb 05, 2008 5:59 am

So indigo can't output at a higher dpi? That doesn't seem correct.

(sorry for misspellings, my typing skills are horrible)

Kram1032 · Post by **Kram1032** » Tue Feb 05, 2008 6:02 am

You actually can pretty much ignore the dpi, as long as you watch your image on screen. Screens more or less have a resolution of 72dpi

If you want to print it, you can have far higher resolutions. That's why you need the dpi.

crojack · Post by **crojack** » Tue Feb 05, 2008 6:09 am

I understand the screen dpi of 72 and that it is possible to change image size/dpi inside photoshop, but you can't add information to an image. Sure you can resize it and add dpi, but it will always come out blurrier when doing this.
That is why it is good to take digital photos really large than scale them down.
I was hoping, since Indigo uses camera settings, to be able to set a much higher resolution without having to render at such a huge size. It seems that it would help render times.

Kram1032 · Post by **Kram1032** » Tue Feb 05, 2008 6:12 am

Uhm...
Sorry, that doesn't work...
On the other hand, that's kinda what Supersampling does

crojack · Post by **crojack** » Tue Feb 05, 2008 6:25 am

I'm more than likely being dense, but what doesn't work?

and, I don't think that there is a Supersampling option in Skindigo.
and I don't really know what supersampling is, but I will search!

psor · Post by **psor** » Tue Feb 05, 2008 6:47 am

I gotta jump in here ...

I often hear people getting confused by DPI (dots per inch). And I really
recommend reading articles/tuts like this ...

Understanding DPI and Image Resizing
Understanding Resolution

And in general, forget about DPI if you are rendering. If you need to
print something and the guy says "I need it in 300dpi" then you should
know what it means to your resolution that you'll choose for your output.
So please don't get overall confused by DPI and resolution ...

Hope this will be of help! ;o))

take care
psor

FakeShamus · Post by **FakeShamus** » Tue Feb 05, 2008 6:48 am

yeah...the only thing that really controls the "size" of your digital image is the total pixel dimensions. dpi is just a ratio - 25 x 50 inches @ 72 dpi is the same as 9 x 18 inches @ 200 dpi.

so if you want larger size (in inches) at higher resolution (150-200 dpi) you need to render more total pixels. and yes, this will take longer than smaller total pixels.

Whaat · Post by **Whaat** » Tue Feb 05, 2008 6:48 am

You have to configure supersampling using 'inifile.txt' with SkIndigo.

psor · Post by **psor** » Tue Feb 05, 2008 6:56 am

Supersampling has nothing to do with the topic guys. It is there to prevent
aliasing artifacts and furthermore to reduce noise a bit through the resizing
and the filtering used by the resizing itself. So please, please, double please
dot not mix those things up.

nb: Supersampling is a factor e.g. Supersampling = 3

Code: Select all

3 x resolution -> 3 x 800x600 = internal resolution of 2400x1800 -> resized to 800x600

No DPI involved ... because there is no printer in Indigo yet!

take care
psor

crojack · Post by **crojack** » Tue Feb 05, 2008 7:12 am

psor wrote:I gotta jump in here ...

I often hear people getting confused by DPI (dots per inch). And I really
recommend reading articles/tuts like this ...

Understanding DPI and Image Resizing
Understanding Resolution

And in general, forget about DPI if you are rendering. If you need to
print something and the guy says "I need it in 300dpi" then you should
know what it means to your resolution that you'll choose for your output.
So please don't get overall confused by DPI and resolution ...

Hope this will be of help! ;o))

take care
psor

thanks psor!!

all is becoming clearer.

Whaat-
is supersampling enabled by default in Skindigo?

Putput DPI question

Putput DPI question

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