Canon scanner CanoScan FS4000US User Manual

							Adjusting Images
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FilmGet FS User’s Guide
Adjusting the Tone Curve
The tone curve adjustment mode is available when the color mode is set to [42-Bit Color]
, [24-Bit 
Color]
, [14-Bit Grayscale]
 or [8-Bit Grayscale]
. Use this mode to adjust the brightness of the image 
by changing the relative input and output values on the tone curve, which is a graphical 
representation of the highlights and shadows. This mode is especially useful for making fine 
adjustments to the brightness of specific areas of an image.
Guide to the Tone Curve Tab
Individual Channels
Click here to adjust each RGB channel separately (not available for grayscale images).
Master Channel
Click here to adjust all three RGB channels at 
once.
To n e  C u r v e
Click anywhere along the tone curve to insert a 
control point, which can then be dragged to 
change the curve shape. You can insert more 
than one control point.
Control Point
Reset Button
Click this button to reset the tone curve for the selected channel to its default shape. 
						

							Adjusting Images
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FilmGet FS User’s Guide
Interpreting Tone Curves
Adjusting a Tone Curve
The images below demonstrate how to adjust the brightness of an image by changing the tone 
curve. In FilmGet FS, the input is the data scanned by the 
scanner and the output is the data displayed on the 
monitor. The tone curve shows the balance between the 
highlights and shadows in the input and output.
.
Unadjusted Tone Curve
Make the curve as smooth 
as possible to provide a 
natural appearance. You 
can check the preview 
image to see the effect of 
any changes.The input halftone data values are shifted to the 
highlight side in the output, making the image 
appear brighter in the display.
The input halftone data values are shifted to the 
shadow side in the output, making the image 
appear darker in the display.
The input highlights and shadows are accentuated, 
sharpening the contrast of the image. Convex Curve
Concave Curve
S Curve 
						

							Adjusting Images
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FilmGet FS User’s Guide
Adjusting the Brightness/Contrast
The brightness/contrast adjustment mode is available when the color mode is set to [42-Bit Color]
, 
[24-Bit Color]
, [14-Bit Grayscale]
 or [8-Bit Grayscale]
. Use this mode to adjust the overall 
brightness or contrast (difference between highlights and shadows) of an image. This mode is 
particularly useful when the original image is too bright or too dark, or the contrast is too flat.
Guide to the Brightness/Contrast Tab
Brightness Slider Tab
Drag the slider tab left (darker) or right 
(brighter) to change the brightness setting.
Brightness Value Input Box
Input a value from –100 to +100 and press the 
[Tab] key to set the brightness level. You can 
also use the   arrow keys to adjust the 
value.
Contrast Value Input Box
Input a value from –100 to +100 and press the 
[Tab] key to set the contrast level. You can also 
use the   arrow keys to adjust the value.
Contrast Slider Tab
Drag the slider tab left (flatter contrast) or right (higher contrast) to change the 
contrast setting.
Reset Button
Click this button to reset the brightness and contrast values to the default values. Contrast
Brightness 
						

							Adjusting Images
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FilmGet FS User’s Guide
Adjusting the Brightness
Adjusting the brightness is effective when the entire image is too bright or dark. You must be careful, 
however, not to create excessive highlights or shadows by setting the value to extreme levels.
Adjusting the Contrast
Contrast is the degree of difference between light and dark areas of the image. Raising the contrast 
accentuates the difference between light and dark. Lowering it reduces the difference between the 
two.
Raising the contrast of blurred pictures is effective in adding clarity to the image. Raising the contrast 
too high, however, will obscure the dark portions or create excessive highlights.
Brightness = Neutral Brightness > Neutral Brightness < Neutral
Contrast = Neutral Contrast > Neutral Contrast < Neutral 
						

							Adjusting Images
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FilmGet FS User’s Guide
Adjusting the Color Balance
The color balance adjustment mode is available when the color mode is set to [42-Bit Color]
 or 
[24-Bit Color]
. Use this mode to adjust the balance between the three colors: red (R), green (G) and 
blue (B). This mode is especially useful when a particular color is too strong or weak.
Guide to the Color Balance Tab
RGB is the acronym for the three primary colors: red, green and blue. These colors can be mixed in different 
combinations (gradients) to form all the colors in the visible light spectrum. You can use the color balance 
adjustment mode to adjust the level of each primary color in the image.
RGB Slider Tabs
Drag the slider tabs left (weaker) or right (stronger) to 
change the setting for each color.
RGB Value Input Boxes
Input values from –100 to 
+100 and press the 
[Tab] key 
to set the RGB color levels. 
You can also use the   
arrow keys to adjust the 
values.
Reset Button
Click this button to reset the color balance to the default values. Red (R)
Green (G)
Blue (B) 
						

							Adjusting Images
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FilmGet FS User’s Guide
Adjusting the Threshold Value
The threshold value adjustment mode is available when the color mode is set to [Black and White]
. 
In contrast to color and grayscale images, which are expressed with brightness settings ranging 
from 0 to 255, all the halftones in black and white images are expressed as either black (0) or white 
(255). The point at which a particular dot is assigned a black or white value is called the threshold 
value. The default threshold value is 128.
Guide to the Threshold Value Tab
You can obtain different effects with an image by changing the threshold value as shown below. The 
threshold functions as a cutoff beyond which all data with lower values are changed to black and all 
data with higher values are changed to white. Accordingly, the higher the threshold, the darker the 
image, and conversely, the lower the threshold, the brighter the image.
Threshold Value Input Box
Input a value from 0 to 255 and press the 
[Tab] 
key to set the value. You can also use the 
 arrow keys to adjust the value.
Threshold Value Slider Tab
Drag the slider tab left (lower) or right (higher) to 
change the threshold value.
Reset Button
Click this button to reset the threshold to the 
default value.
Image scanned at the 
default threshold valueImage scanned at a 
higher value (slider 
moved to the right)Image scanned at a 
lower value (slider 
moved to the left) 
						

							CanoScan FS4000US Film Scanner
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FilmGet FS User’s Guide
CHAPTER 5
Other Functions
This section explains the items on the pull-down menus accessed from the 
FilmGet FS menu bar.
[Settings] Menu ..............................................................86
[Device] and [Help] Menus ............................................96 
						

							Other Functions
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[Settings] Menu
Adjusting the Exposure
When FilmGet FS is first installed, the “Auto Gain” option is set to on (checked) by default. This is the 
setting you are recommended to use in most cases. With this setting the exposure (amount of light 
passing through the film) and coloring (negative film only) are set automatically by the scanner.
However, if a film is not producing well with this setting, you can turn off the Auto Gain option and 
adjust the exposure manually. You may also wish to use the manual setting if you are scanning a film 
that has been intentionally under- or overexposed, or that contains an image that is extremely bright 
or dark. The default exposure value is 0.
You cannot use the auto gain mode when the “Use Color Matching” option is on. To use the auto gain mode, 
first set the “Use Color Matching” option to off. See p. 89, “Use Color Matching” for an explanation of switching 
the Use Color Matching option.
The setting is reflected to all frames of the film loaded into the holder. You cannot set each frame individually.
Click the 
[Settings] menu and select 
[Exposure Settings...].Click to add or remove the check mark. The option is 
on when the check mark is present.
Exposure Slider Tab
Drag the slider tab left or right to change the 
exposure setting. For positive film, drag the slider 
tab right to increase the exposure or left to 
decrease it. The opposite applies to negative film.
[Cancel] button
Click here to cancel the changes and close the 
dialog box.
[OK] button
Click here to accept the changes and close the 
dialog box. Auto Gain Check Box
You can set the exposure manually when the 
check mark is removed (off). 
						

							Other Functions
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The scanning process involves passing light through the film and reading the resulting data. You can adjust an 
image’s brightness by controlling the amount of light, which may also be called the exposure. The exposure is 
controlled by speeding up or slowing down the rate of the scan.
Changes to the exposure value are reflected immediately to the preview image. An overexposed 
image appears very bright, while an underexposed image appears very dark.
Setting the Clean Dust/Scratches Function (FARE)
This option sets whether to automatically identify dirt and scratches on the film surface and correct 
these defects to provide a clear image during preview and final scanning. When FilmGet FS is first 
installed, the “Clean Dust/Scratches” option is set to off by default.
Exposure = Neutral Overexposed
Underexposed
Click the 
[Settings] menu and 
select 
[Clean Dust].
Click a radio button to select 
[Off], 
[On (Standard)] 
or 
[On (Strong)]. 
						

							Other Functions
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Clean Dust/Scratches processing is not performed during the thumbnail scan.
Clean Dust/Scratches processing is performed when the color mode is set to [24-Bit Color] or [42-Bit Color].
When the film type is set to monochrome, all items are grayed out and unavailable.
When using the Clean Dust/Scratches function, the [On (Standard)] setting is recommended for normal cases.  
If you desire a higher level of image correction, the [On (Strong)] setting is recommended.
The Clean Dust/Scratches function may not be effective when using Kodachrome film.
The setting is reflected to all frames of the film loaded into the holder. You cannot set each frame individually.
When [On (Strong)] is selected, the corrected portion of the image may become scrambled.
Adjusting the Focus
This option sets whether to focus the lens automatically during scanning. When FilmGet FS is first 
installed, the “Autofocus” option is set to on (checked) by default.
“Autofocus” can normally be used without problems, but when film warping, distortion or other 
factors make the image appear blurry, set the “Autofocus” option to off and adjust the focus 
manually.
The setting is reflected to all frames of the film loaded into the holder. You cannot set each frame individually.
Click the 
[Settings] menu and 
select 
[Set Focus].Autofocus Check Box
Click to add or remove the check mark. The 
“Autofocus” option is on when the check mark is 
present.
Focus Slider Tab
Drag the slider tab left or right to change the focus 
value setting.Input a value from 1 to 100 
and press the 
[Tab] key to 
set the value. You can also 
use the   arrow keys 
to adjust the value.