Everyone has their own views as to what needs to be done to
an image before it's exported into Photoshop. The following are few
hints as to which tools offer the quickest and easiest route to a
reasonably colour/tone accurate image. Obviously you should experiment by
yourself, it's only through such trial and error that you can ever hope
to learn SilverFast.
discuss some of the tools we have one more dialog to configure, the Auto settings
dialog. You can access this dialog by simply pressing the Option button followed by selecting the Auto
tab. The following screenshot shows "my"
settings. They are, excepting two the default settings.
Cast Removal tool is a new feature introduced in version 5.2, and comes in handy
with some images. When set for 100% any colour cast (as determined by
SilverFast) will be totally removed. Sometimes this a good thing, on
others it makes for a horrible effect, pick your values wisely, but
something in the order of 10% to 20% might be enough for most images.
You won't see the effect immediately or might never see any at all, so don't expect any on screen
change to your image yet.
Next, I deselect the Auto
Contrast, I have no liking for this feature, but you may feel
differently. You can refer to the SilverFast manual for a more comprehensive
explanation of each of the remaining settings.
tool bar running across the top of the Frame dialog is the real powerhouse of SilverFast. I'll only
be touching on a few adjustment tools, but at least should get some idea of where to
Adjustment Tools Palette
Automatic Tone and Colour Correction
We can identify whether
SilverFast will or will not automatically apply colour correction by
checking which form the Auto Adjustment (aperture symbol)
takes in the Adjustments toolbar -
and both mean that Auto
Colour Correction will NOT take place and
means that it will.
So our first
step in colour/tone correcting the image is to press the Auto Adjust button.
Users with IT8 calibration or a
customised ICC scanner profile will find that SilverFast ignores any colour
casts it finds in the pre-scan and so Auto Adjust will simply
correct the tonal range of the image.
Usually the shadows will darken and the highlights brighten. With some
images the midtones can also change. We can see what has changed without
even inspecting the image because either the histogram
gradation button will have changed colour (e.g.
If on the other hand you are
using SilverFast without the benefit of IT-8 calibration or a
custom ICC profile then
SilverFast will automatically remove any colour casts found in the
image (not a good
idea for sunsets). The user can preset the amount of
cast removal by inserting a value into the Color Cast Removal popup
shown in the Histogram dialog below. The default value of 100% will
completely remove the colour cast an a value of 0% will leave the
cast untouched. Alternatively we can hold down the Shift key when pressing
and the colour cast will be retained.
the Colour Cast Removal
option mentioned above, well now you should appreciate why I suggested values
between 10% and 20% as starting points. If we look at the Histograms
below it can be seen that in one the system has cancelled out only 20% of the
colour cast. Had I set a higher or lower value then the Histogram would
reflect that. Also note that you can fine tune the degree of cast
removal by dragging the slider left or right. The second Histogram
shows the effect of leaving the default value of 100% colour correction.
|Auto Colour Correction
||Auto Colour Correction
points and white point have also been set automatically as per the
values we chose in the Auto
we look at the Gradation Curves dialog for the same image as was
used for Histogram correction. The first screenshot shows that only the gradation (or gamma) has been modified by the
automatic settings and the second shows the effect of leaving Auto
Contrast ON. As with all SilverFast adjustment tools we can make further adjustments as needed.
|Auto Contrast OFF
||Auto Contrast ON
Photoshop we can pull the master or individual colour channel curves in any way we
choose thus optimising contrast, etc. We can achieve this by simply
moving the gradation slider or just grab the curve and pull it. The
brightness and contrast of the image can be further refined, as can the
highlight and shadow points. Remember all of this is occurring on a
high-bit image, so the amount of image data being trashed is minimal.
Better still, the original scan will never be changed, it remains
Manual Tone and Colour Correction
method was based upon automatic correction of the image with some manual
fine-tuning. For those who prefer manual correction SilverFast Ai and HDR
have the tools. I mentioned the highlight and shadow points above and
how they were automatically adjusted, but say you didn't want them
adjusted automatically, or worse didn't know were they where. Not a
problem, finding the white or black point in an image is a simple matter
of clicking with the white or black square on the
Once you find the required points in the image then simply click them
with either the highlight
shadow tool, and the image highlight or shadow will be brought to
neutral. The centre of this icon can be used to set midtones to neutral.
Again the gradation curves dialog has a major part to play in getting
colour and tone correct, so experiment.
remaining icons on the toolbar, i.e. Global
Colour correction are
discussed in Tutorial 3 and well worth investigating all the
same. Further guidance on basic image editing in SilverFast can be found
Once you are
satisfied with the corrections it simply a matter of transferring the
corrected image to Photoshop for printing, saving whatever. This is
achieved quite simply by pressing the Scan
Whiterocks and Cloud Pattern - North Antrim Coast