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 |
