ORIS PDF Tuner Version 4.4.8 User Manual - image2output - Support

Changing Image Color Mode
Notes on Color Mode Conversions
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Converting CMYK Images
When CMYK images are converted to grayscales, the COLOR TRANS-
FORMATION function starts and the SEPARATION mode is selected automatically
(see Manipulating Image Color Separations, page 24-4).
You can then click LOAD in the MENU window and select one of the predefined
transformation settings, e.g. CMYK-GRAYSCALE 2 (SKY).
Alternatively, specify the amount of color to be used from the C, M, Y and
K channels. Proceed as follows:
1. Select a color channel.
To do so, repeatedly CTRL-click (Mac OS) or right-click (Windows) on
the image or select NEXT COLUMN in the MENU window. The selected
color channel is indicated by an asterisk (*) in the MENU window.
The + and – signs indicate that the percentage
value is respectively greater or lower than 0 (for the
C, M and Y channels) or than 100 (for the K channel).
A blank indicates 0% and 1 indicates 100%.
2. Modify the current value, e.g. by entering it directly on the keyboard
(see page 29-7). The specified percentage value is indicated in the
STATUS window.
Note:
Alternatively, click on the image or select CHANGE VALUE in the MENU
window. Make sure the cursor is placed on the image, then hold SHIFT
and the mouse button pressed down and move the cursor vertically.
When the value you want is reached, click on the image or reselect
CHANGE VALUE.
3. The next color separation is now selected automatically and can be
modified as explained above.
4. When finished, press RETURN/ENTER or click .
If a CMYK image already looks like a grayscale image (i.e. all separations
except Black are 0%), the GRAYSCALE function changes only the
image color space. It will not start any image manipulation function.
Notes on Color Mode Conversions
• Color space conversions are only possible if all image pixels are
loaded. See also Loading as Low-res Image or Preview (page 20-8).
• If you have only loaded an image section, it is only possible to modify
and save this section (see also page 20-8).
• In the STATUS window, grayscale images are identified by the image
type BW (‘black and white’).
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