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Eric Holzapfel
Bicubic smoother vs. sharper
on Sep 17, 2010 at 10:13:20 pm

Hello All,

I posted this under a similar post, but no responses.

I have scanned 35mm slides at 4000dpi.

I plan to print some of these at around 300 dpi or so.

So, am I enlarging the image, or making the image smaller?? I will guess
that as far as document size I am enlarging, and therefor should use
bicubic smoother for the interpolation. If I set bicubic smoother in the
image size dialog will the setting stay if I use the crop tool? It seems the setting is not maintained if I use the crop tool.

One other question, I am slso using some of the slides for a video.
Which is 72dpi. I use pixel dimensions of 1260x720 - can I assume I should use bicubic smoother for this as well? I have the same question in terms of the crop tool vs. the image size dialog. i.e.

If I set bicubic smoother in the image size dialog, is it saved when I use the crop tool?

Thanks again,

Eric

Final Cut Pro, Adobe After Effects, Photoshop


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Neal Hammers
Re: Bicubic smoother vs. sharper
on Sep 19, 2010 at 12:49:02 am

My friend, Your post doesn't make a sense, since it looks like You have missing the veeeery basic understanding of what does "dpi" mean. Have a look in wikipedia or any other resource, then take a calculator or sheet of paper and do a math. Don't worry - this won't be a rocket science, just mult and div. I am sure for You it will be better to find answers Yourself.
Best wishes.


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Eric Holzapfel
Re: Bicubic smoother vs. sharper
on Sep 19, 2010 at 1:45:07 am

Thanks.... I think...

Final Cut Pro, Adobe After Effects, Photoshop


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Theo van Laar
Re: Bicubic smoother vs. sharper
on Sep 19, 2010 at 1:09:09 pm

Which size do you want to print it?

And which type of video are you using? PAL? NTSC? HD? ...?

Ans just realize that there is some debate about using bicubic smoother or sharper when you upsize.

Theo


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Eric Holzapfel
Re: Bicubic smoother vs. sharper
on Sep 21, 2010 at 2:07:35 am

Hello Lars,

I plan to print the document at about 300 to 330 dpi - and the video stuff will be at 72dpi, destined for
dvd, and since in US - NTSC. I do understand DPI, etc So I suppose even though the
film (35mm) is scanned at a HIGH res (4000 dpi) 300 dpi makes for a larger image!

thanks for asking,

Eric

Final Cut Pro, Adobe After Effects, Photoshop


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Theo van Laar
Re: Bicubic smoother vs. sharper
on Sep 21, 2010 at 10:41:05 am

'I plan to print the document at about 300 to 330 dpi'

I was asking for the size of the printed output (in cm, inches, hm, km, um or whatever you are used to). dpi is not a size but a resolution.

Theo


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Eric Holzapfel
Re: Bicubic smoother vs. sharper
on Sep 24, 2010 at 3:07:34 pm

oops!! print size for this is 13.7 inches by 9.2 inches.

at the 4000dpi scan level - this gives me around 333 dpi or so.

I have scanned some slides at 2400dpi and the 13.7 x 9.2 output is about 150dpi,
which, based on viewing distance seems ok. My viewing distance is from 2 feet to 5 feet away from
print.

I know that a famous photog and artist (Robert Wiengarten) makes prints as large as 40x60!
I am trying to find out what dpi is digital images are captured at, and what he prints at.

Thanks,

Eric

Final Cut Pro, Adobe After Effects, Photoshop


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Keith Pratt
Re: Bicubic smoother vs. sharper
on Sep 24, 2010 at 4:42:04 pm

Eric Holzapfel: "I know that a famous photog and artist (Robert Wiengarten) makes prints as large as 40x60!
I am trying to find out what dpi is digital images are captured at, and what he prints at."


For prints of that size the norm would be to use medium or large format; in which case the DPI would not be directly comparable with 35mm.


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Eric Holzapfel
Re: Bicubic smoother vs. sharper
on Sep 24, 2010 at 4:57:44 pm

Hello Keith,

I fully appreciate the difference there. I was merely stating that I would like to know
more about his workflow in terms of the work he produces, not as related to a 35mm scan, etc.

Thanks,

eric

Final Cut Pro, Adobe After Effects, Photoshop


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