4.3.6.4 X Gamut Map Tool
X Gamut Map Tool Function:
The Gamut Map Tool provides an interface to the CME Gamut Mapping
programs and allows the user to preview the results of particular
mappings on a sample subimage. The tool provides several methods
of specifying gamut expansion and contraction parameters and allows
for viewing the results of multiple mapped images. The original
subimage is provided as a comparison with the mapped images.
The methods for specifying map parameters are the following: User
Specified where the user enters the parameters; Neural Net Suggestions
where the Neural Net knowledge base of image features and applied
map parameters determines an appropriate set of map parameter; Search
Parameter Range where a matrix of a range of parameters can be examined;
Interactive Parameter Search where the corner parameters of a parameter
area are progressively examined with the user interactively selecting
the next corner of the area to search.
The Gamut Map Tool can be run as a stand-alone program or can be
initiated through the ColorTool within Xid. When run stand-alone,
the parameter to the program are XGamutTool preview image dltfentry
Preview Image Name:
This button and input text field provide a mechanism for specifying
the file name of the LAS image to be previewed. By pressing the
push button, a file browser will be displayed to allow selection of
the image file, or the name of the file can be entered in the text
field directly. If executed from Xid, this field will be entered
from the name of the Full Resolution or Main Window image saved
for previewing. Note that for performance purposes, the preview
image should be no larger than 1024x1024.
Gamut Map Parameter Selection Toggles:
This specifies the method for selection the map parameters.
When additional input is required for the option, additional entry
fields are added to the form for the option. Press the Apply
button to initiate process with the options specified.
Input/Output Model Option Buttons:
These option buttons allow for specification of the input and
output models for the gamut mapping. The Input Model will primarily
be the model for the display where the image was manipulated with
Xid. The output model specifies the printer device model.
Gamut Map Mode Toggles:
The Gamut Map Mode can be either spherical or cylindrical and
describes the coordinate system used in applying the gamut map
expansion and contraction parameters.
Apply Button:
The Apply button processes the current option settings and invokes
the appropriate gamut mapping functions on the preview image. The
functions invoked and the messages from those functions are displayed
in the message window. Note that these functions do require
significant processing and as such response from these functions
will vary from 1 minute to longer depending on options selected.
Create PDF Button:
When the "best" set of map parameters have been determined, use the
Create PDF button to create a LAS parameter definition file with
the necessary parameter to map the image to the output device.
The PDF file will be named based on the image name appended by
".pdf".
Dismiss Button:
The dismiss button terminates processing of the X Gamut Tool.
User Specified Gamut Map Parameters:
Sliders and text entry fields are provided for specifying the Gamut
expansion and contraction parameters in the range from .01 to 1.0.
The Measure Distortion toggle specifies an additional step to
calculate the distortion from the original image. Weigting parameters
can be entered to weight luminance, saturation and spatial energy
image feature differently in the distortion calculations. Weighting
parameter default to 1.0 and can range from 0.0 to 10.0.
Search Range Parameters:
Sliders and text entry fields are provided for specifying the range
and increment of map parameters to test. This allows are large
number of possible images to be mapped. Distortion is calculated
for each image, and the list of images is displayed in increasing
order of distortion. Weighting parameters can be specified to
change the calculation of the distortion.
Dismiss:
The Dismiss button hides the map tool window.