filmscanners: Vuescan 7.2.3+ Filter|Grain reduction

2001-11-12 Thread Bob Shomler 

Someone recently asked if there was any discernible difference among the 
low-medium-high settings with Ed's improved grain reduction filter in vuescan 7.2.3.  
I thought I'd try some small comparisons from a negative scan, a small crop of sky and 
snow from a near-end-of daylight scene -- sky being a common area where grain aliasing 
is noticeable and grain a reduction filter can assist with image quality.

I think differences are noticeable.  File sizes of almost same 200x200 pixel crop are 
different: 28, 25, 23 and 21 KB for none, low, medium and high grain filter setting 
(decreasing file size indicating a reduction in detail from the filter action).

I also included the same crop processed by vuescan 7.1.23 and 7.1.25 (these exhibit 
color differences too).  The negative was scanned on a LS-30 at full res (2700) using 
white balance color and IR clean.  Six files are at

  www.shomler.com/vuescan/

v7203n.jpg, v7203l.jpg, v7203m.jpg, v7203h.jpg, v7125h.jpg and v7123h.jpg are 
approximately the same crop using, respectively vuescan grain reduction filters 7.2.3 
none. 7.2.3 low, 7.2.3 medium, 7.2.3 high, 7.1.25 high and 7.1.23 high. Scan was with 
IR clean on.  There are some color differences between 7.1.23, 7.1.25 and 7.2.3.  
Scans are 48-bit mode, reduced to 24bit in photoshop 6.0.1.  Jpeg is from photoshop, 
compression maximum quality/12, color space AdobeRGB.

Complete image (September sunset on Mt. Shasta, California) may be seen at

  www.shomler.com/other/0011329.jpg

Crop is from upper right quadrant.


--
Bob Shomler
http://www.shomler.com/gallery.htm

Re: filmscanners: Vuescan 7.2.3+ Filter|Grain reduction

2001-11-12 Thread Maris V. Lidaka, Sr. 

Thanks for taking the time and trouble to run this test and to post the results.

To me it's clear that VueScan's 7.2.3+ grain-reduction filter is a substantial 
improvement over 7.1.23 and 7.1.25

Thanks, Ed, for the improvement.

Maris

- Original Message - 
From: "Bob Shomler" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, November 12, 2001 6:13 PM
Subject: filmscanners: Vuescan 7.2.3+ Filter|Grain reduction


| Someone recently asked if there was any discernible difference among the 
|low-medium-high settings with Ed's improved grain reduction filter in vuescan 7.2.3.  
|I thought I'd try some small comparisons from a negative scan, a small crop of sky 
|and snow from a near-end-of daylight scene -- sky being a common area where grain 
|aliasing is noticeable and grain a reduction filter can assist with image quality.
| 
| I think differences are noticeable.  File sizes of almost same 200x200 pixel crop 
|are different: 28, 25, 23 and 21 KB for none, low, medium and high grain filter 
|setting (decreasing file size indicating a reduction in detail from the filter 
|action).
| 
| I also included the same crop processed by vuescan 7.1.23 and 7.1.25 (these exhibit 
|color differences too).  The negative was scanned on a LS-30 at full res (2700) using 
|white balance color and IR clean.  Six files are at
| 
|   www.shomler.com/vuescan/
| 
| v7203n.jpg, v7203l.jpg, v7203m.jpg, v7203h.jpg, v7125h.jpg and v7123h.jpg are 
|approximately the same crop using, respectively vuescan grain reduction filters 7.2.3 
|none. 7.2.3 low, 7.2.3 medium, 7.2.3 high, 7.1.25 high and 7.1.23 high. Scan was with 
|IR clean on.  There are some color differences between 7.1.23, 7.1.25 and 7.2.3.  
|Scans are 48-bit mode, reduced to 24bit in photoshop 6.0.1.  Jpeg is from photoshop, 
|compression maximum quality/12, color space AdobeRGB.
| 
| Complete image (September sunset on Mt. Shasta, California) may be seen at
| 
|   www.shomler.com/other/0011329.jpg
| 
| Crop is from upper right quadrant.
| 
| 
| --
| Bob Shomler
| http://www.shomler.com/gallery.htm
|