SilverFast HDR Studio 8 Interpolation

[peter k]

Ok ya got 8 up and running... Is there anyway I can enlarge the image that I input, in HDR 8?
Example I have a 5x6 image that I would like to make 11.25 high, and the width to remain the same proportion, but at the same 350 dpi.

[LSI_Ketelhohn]

Dear Peter,

To scale images you ned to open the "lock" behind the resolution slider.

Screen shot 2012-09-07 at 11.23.02.png (5.27 KiB) Viewed 2962 times

kind regards,
Arne Ketelhohn.

[peter k]

Thank you, that helped!
Now is this interpolation done all at once? ... or?

Background: In the past in P.S. we did one, 10% step at a time, to get better quality, until we obtained the size we wanted.

What are your suggestions?

[LSI_Ketelhohn]

Dear Peter,

What do you mean by

Now is this interpolation done all at once? ... or?

?

kind regards,
Arne Ketelhohn

[peter k]

I'm a relative newbie, so please bear with me.

When one scans film, the image is physically there, and is scanned to the output size one wishes to have.
My understanding, which may be wrong, unless one goes overboard, no interpolation is needed or done, because through the actual scan, the 'information' is there, in the emulsion, to be used.
Interpolation comes into play when that image has been saved, and then edited again, to increase the physical print size. That the image is increased in size, by adding space between the actual pixels of the image. There is no real 'information' added, but a restructuring of the image so it becomes larger.
Not fully understanding the mathematical undertaking within interpolation, in PS, one can adjust the size of the image in one step, or several, as is often done, at a 10% steps. This is the way I have done it in the past. My research, previous to using SF, seemed to indicate a better image doing it in a step progression, which can done in PS, but it can take a considerable amount of time. Requiring 7 to 11 steps, to finally reach image size needed.

That's PS, this is SF.

With this question, what I am hoping for, is to facilitate an easier editing procedure, in which I do not have to use PS for interpolation.
I know now in HDR, I can unlock, and increase the image size, and it will interpolate to the size I have requested.

But how is this done?
I really do not need the specifics, but is it done in a mathematical manner, that steps it, to give it a better overall image, rather than in just one big step?

As you can tell, I'm at sea here.
Trying to get the very best available print, of some oil paintings, that will be displayed at 11" high x ? with a better work flow, for an art book.

[LSI_Ketelhohn]

Dear Peter,

Interpolation is only necessary if you need images larger than those the scanner can provide by itself.
So you are correct there.
SilverFast uses a bicubic interpolation.
We offer interpolation up to two times the hardware resolution.

For even larger images several companies offer advanced resizing tools and photoshop plug-ins.


kind regards,
Arne ketelhohn.

[peter k]

thanks for the reply.. could you explain a little further ..

We offer interpolation up to two times the hardware resolution.

as in the largest size I can scan with my V700, through your program... ?? ... or...

[LSI_Ketelhohn]

The resolutions offered by Silverfast are those the scanner driver offers.
That will vary by device.
The V700 has different maximum resolutions depending on wether you use the full area scan plane or the film holders.
The last value the resolution slider offers is the maximum interpolated resolution.
The step previous to that is the maximum hardware resolution.

kind regards,
Arne Ketelhohn.