You can open this dialog by clicking "Modify" (gamut mapping) in the "Generate profile" dialog > "Show profile options".
You can set a user-specific gamut mapping here or switch back to the default setting (optimized gamut mapping).
You can change color saturation in this dialog. These changes affect the entire image, for example, if there is not enough chroma in the image. You can also set a a gray axis correction for color paper in this dialog.
Click "OK" to confirm your changes and close the dialog.
When you click "Default", the default settings are restored and the dialog closes.
Click "Cancel" to close the dialog and discard any changes to it. The last setting is restored.
•Colors located outside the printable color space are remapped harmoniously into the space occupied by the printable colors. Moreover, maximum utilization of all printable colors is desired. The hue remains unchanged, the chroma, if required, is reduced moderately and the lightness adjusted.
•Dark, chromatic colors normally become lighter; light, chromatic colors become darker. The details of the image are retained as much as possible. Colors which actually can be mapped with the printing process are shifted slightly within the color space to obtain space for the even purer colors which are to be mapped.
•Absolute white (density = 0.0) is reproduced as paper white; absolute black (density > 3.5) is reproduced using the maximum dot area permitted for the process colors.
Use the global setting to influence the reproduction of saturation (chroma) right across the entire color gamut. For example, you can change the default settings for the profile if the chroma of images that were edited is too high or not enough, even if the camera or scanner profile was correct.
For certain cases, you can modify the restrictions which are part of optimized gamut mapping by changing the gamut mapping settings in different areas.
Setting for light saturated colors
You can influence gamut mapping in light colors using the "Preserve lightness/Preserve contrast" slider. You can set the lightness/contrast ratio by moving the slider. In particular, you can thus influence the reproduction of the saturated and light non-printable colors.
•"Preserve lightness": If you shift the slider to the left, i.e., set a value between "0" (central position) and "-5", lightness is maintained and weighted accordingly. If you want to prevent the saturated colors from becoming darker (affecting the chroma negatively), shift the slider to position "-5" (only lightness). This may result in a loss of detail in the image.
•"Preserve contrast": If you shift the slider to the right, i.e., set a value between "0" (central position) and "+5", contrast is maintained and weighted accordingly. This may cause light, chromatic colors to appear too "heavy". If you have an optimally reproduced detail contrast, it may be accompanied by a loss of chroma in the colors which then appear darker in position "+5" (only contrast).
•The default setting is slider position "0". This setting reflects conventional results in reproduction work.
Setting for dark saturated colors
The second slider ("darker/lighter") is used to influence gamut mapping in saturated dark colors.
•"darker": If you shift the slider to the left, i.e., set a value between "0" (central position) and "-5", the chromatic colors become darker. As a result, the darker and more chromatic a color, the higher the percentage of black. However, this makes strict checking of the printing process more important.
•"lighter": If you shift the slider to the right, i.e., set a value between "0" (central position) and "+5", the saturated colors become lighter. Particularly dark, chromatic colors appear lighter and more brilliant. At the same time, there is a noticeable loss of detail.
This setting is suitable for the reproduction of slogan-like or placard-type material in which a high degree of definition is not important (e.g. newspaper printing) and also for printing processes with low UCR values (e.g. with dot areas of 270%).
•The default setting is slider position "0". This setting reflects conventional results in reproduction work.
"More contrast in dark colors": Check this box if you wish to increase shadow details (lightness correction). By default, this function is disabled.
Global setting of color saturation
The "gray/colored" slider affects the entire image in a similar way to chroma gradation, but for each color in relation to the chroma available in each case.
•"gray": If you shift the slider to the left towards "gray", in other words, a setting between "0" (central position) and "-4", all colors are desaturated. Colors are fully desaturated if the slider is in position "-5". This corresponds to a four-color black-and-white reproduction ("quadruplex") as is found in newspaper printing.
•"colored": If you shift the slider to the right towards "colored", in other words, a setting between "0" (central position) and "+5", there is a post-saturation of all colors, an effect which is usually desired in newspaper printing. On the other hand, this also means that the color at the outer sections of the process color space might be pushed together so strongly that it may not be possible to differentiate the chroma in them at all.
•The default setting is slider position "0". This setting reflects conventional results in reproduction work.
Global setting darker / lighter
The "gray/colored" slider affects the entire image in a similar way to chroma gradation, but for each color in relation to the chroma available in each case.
•"darker": If you shift the slider to the left towards "darker", in other words, a setting between 0 (central position) and -5, the image becomes darker on the whole (as if underexposed).
•"lighter": If you shift the slider to the right towards "lighter", in other words, a setting between 0 (central position) and +5, the image becomes lighter on the whole (as if overexposed).
•The default setting is slider position 0. This setting reflects conventional results in reproduction work.
Normally, in Prinect Color Toolbox the separations in color papers are calculated relative to paper white ("Perceptual" rendering intent). In other words, the gray axis is also calculated relative to paper white. For that reason, in yellowish papers, the gray axis is also yellowish when reproduced. The eye, however, perceives this gray axis relative to the (yellowish) paper as neutral. In some cases, however, you do want that the gray axis remains neutral (absolute) when reproduced on yellowish papers as well.
This option allows you make the gray axis neutral (from the dark midtones to the light midtones) going towards highlight as far as the hue of the paper). You can set how neutral the gray axis will be with this slider. You enable the slider by first checking the box.