Step 5 - Choosing the film type and exposure
Using NegaFix in Basic
mode amounts to carrying out six very simple tasks. They are:
- Crop the image so that frame margins are excluded.
- Select a film manufacturer.
- Select a film type.
- Select a film speed.
- Adjust the manual exposure slider.
- Apply Auto Adjust tool.
The NegaFix control panel
offers three pop-up menu options and an exposure slider. The
three pop-up menus are where we choose the film-maker, type and
Selecting the Film
maker for the NegaFix
The exposure slider (circled red in the screenshot below) enables adjustments of approximately
plus or minus 3 f-stops. The preview display is continually
updated as the exposure slider is moved.
Adjusting Exposure using the NegaFix
The above steps (1 to 5) are designed to ensure that the optimum
dynamic range of the negative has been captured and converted into a
positive. Now it's simply a matter of applying (6) the Auto Adjust
the Adjustments Toolbar and SilverFast will complete
the optimisation process. At this point we can simply press the scan
button or make further adjustments to saturation, etc.
Fine Tuning the Image and Film Profile
Step 6 - Expert mode
NegaFix with SilverFast Ai and HDR
the user to scan virtually any negative film so that they obtain the
maximum dynamic range along with accurate colour rendering. In
my view the
feature is a substantial improvement over its predecessor and is
comparatively easy to use.
The screenshot below shows the
control panel in its Expert configuration. To gain access
to the Expert panel we simply mouse click the Tutor Icon,
which is just to the right of the exposure slider.
Panel - Expert Configuration
From the Expert panel we can adjust the characteristics
of the "orange mask" removal filter by dragging
the Auto Tolerance slider (green circle in screen capture)
back and forth. Likewise the Highlight and Shadow (end)
points on the histogram can be adjusted by dragging the slider
"bars" located on the greyscale gradients. The check
mark adjacent to the Auto button will be deactivated once
we make any adjustment to the "end-point" sliders. If we
don't like what we've done a simply click of the Reset
button followed by the Auto button and everything is reset
to back to the characteristics of the original film profile.
Step 7 - Creating New Film Profiles
If we want to refine the film curve characteristics or if the film we are scanning is not
included within the list of 120 film profiles it's a simple
matter of adjusting one of the existing profiles in "real-time"
so that we get the desired results. As mentioned above, manually
adjusting the end-points of
the histogram is used to eliminate the effects of the "orange mask".
To further refine the film profile, simply choose the Curves
tab followed by the two icons circled in red and then start
dragging the curve anchor points around until the desired
result is obtained. It is even possible to adjust each of the
RGB colour channels individually.
Panel - Custom Film Profile
If an area of the image shows a colour or cast that we
know to be incorrect we can neutralise this cast by simply
clicking that point in the Image preview screen and then
dragging to the baseline; the small dot on the Curves
Gradient (HSL dialog below the curves) that represents the actual colour of the
point - see the red circle and arrow on screenshot below.
Panel - Colourcast Removal
To reduce the saturation of a particular colour it's simply a
matter of clicking the over saturated colour within the image with
the mouse and again dragging the little dot in the HSL dialog down
a little. To increase saturation we drag it up towards the top of
the HSL dialog. Ideally when undertaking such an adjustment it is
best to zoom into the HSL dialog using the little "+" sign to the
right of the gradient. Be warned that this approach will effect
all subsequent images that use this film profile and so I recommend using
the Hue/Saturation control to be found within the main toolbar.
Adjusting the Saturation
When we are satisfied with the new
profile we simply save it with the appropriate film name thus
keeping it for future use.
Save Edited Film Profile
Give the Edited Film
Profile a Name
Once the dynamic range of the film has been optimised we can
again proceed to use SilverFast's other colour correction
tools in the normal way. Usually clicking the SilverFast Auto Adjustment
button (circled red below) is all that is required.
The SilverFast user manual contain lots
of information and useful tips to using NegaFix
I recommend that you read this section of the manual before attempting
to manipulate the existing film curves.
The remaining pages of this tutorial discuss some of SilverFast's
more advanced colour and tone adjustment tools in more detail.