ExportToSeparatedTIFF (arcpyproduction.mapping)

Récapitulatif

Exports the page layout or data frame of an .mxd to separate Tagged Image File Format (TIFF) files based on color mapping settings.

Discussion

TIFF files are the most versatile raster format. TIFFs can store pixel data at several bit depths and can be compressed with either lossy or lossless compression techniques depending on file size and accuracy requirements.

Maps can be exported to 1-bit TIFF format, color-separated files based on the unique list of colors defined in symbols that appear in the data frame and page layout. For more information on styles and choosing colors, see ArcGIS for Desktop help.

The defined colors and their parameters can be set up and exported to an ECT file. This ECT file can then be loaded by any system using the TIFF Color Separator. In this way, a color definition file can be set up for different production workflows. This color file can then be distributed for use during the color separation process. Tools for loading and saving color files help with this process.

To export a single data frame instead of the entire page layout, pass a DataFrame object to the function's data_frame parameter. Because data frame exports do not have an associated page to provide height and width information, you must provide this via the df_export_width and df_export_height parameters.

Controlling graphic quality of the generated image differs for page layout exports versus data frame exports. When exporting a page layout, control image detail by changing the resolution parameter. When exporting a data frame, keep the resolution parameter at its default value, and change the df_export_width and df_export_height parameters to alter image detail. The height and width parameters directly control the number of pixels generated in the export file and are only used when exporting a data frame. Images with larger numbers of pixels will have higher image detail. For most page layout exports, the default parameter values should generate good results and nice looking export images on the first try. For data frame exports, you may need to experiment with the df_export_width and df_export_height values a few times before getting the result you want.

Refer to Exporting to Separated TIFF in ArcGIS for Desktop help for more detailed discussions on exporting maps.

Remarque :

File sizes can differ when map documents are exported using arcpyproduction.mapping instead of the ArcMap commands. This is due to the differences in the functions in the Python module versus the commands in ArcMap.

Syntaxe

ExportToSeparatedTIFF (map_document, out_tiff_path, settings_file, {file_format}, {compression}, {invert_plates}, {data_frame}, {df_export_width}, {df_export_height}, {resolution}, {world_file}, {root_filename})

Paramètre	Explication	Type de données
map_document	A variable that references a MapDocument object.	MapDocument
out_tiff_path	A string that represents the path to the directory where the separated TIFF files will be created.	String
settings_file	The path to an Esri Color Table (ECT) file that contains the color mapping settings to be used when the TIFF is generated.	String
file_format	Indicates the format in which the color files are exported. COMPOSITE_TRUE_COLOR —Exports the image without color mappings. EIGHT_BIT_SEPARATES —Exports the image using 8-bit color separates, where one color mapping is created for colors based on similar RGB values. White is excluded from the mappings. ONE_BIT_SEPARATES —Exports the image using 1-bit color separates, where one color mapping is created for each color in the map. This is the default value. (La valeur par défaut est ONE_BIT_SEPARATES)	String
compression	Indicates what compression method is used to encode the image. NONE —No compression is applied. PACKBITS —The PackBits compression, which is supported for one-bit and eight-bit separates. CCITT_GROUP_4_FAX —A compression that is only valid for one-bit separates. This is the default value. (La valeur par défaut est CCITT_GROUP_4_FAX)	String
invert_plates	Indicates whether the output values are toggled between positive and negative values for the exported TIFF files. This is only supported with one-bit and eight-bit separates. (La valeur par défaut est False)	Boolean
data_frame	A variable that references a DataFrame object. Use the string/constant PAGE_LAYOUT to export the map document's page layout instead of an individual data frame. Remarque : This parameter is required if you define the world_file parameter. (La valeur par défaut est PAGE_LAYOUT)	DataFrame
df_export_width	A number that defines the width of the export image in pixels for a data frame export; df_export_width is only used when exporting a data frame. Exporting a page layout uses the map document page width instead of df_export_width. (La valeur par défaut est 640)	Integer
df_export_height	A number that defines the width of the export image in pixels for a data frame export; df_export_width is only used when exporting a data frame. Exporting a page layout uses the map document page width instead of df_export_width. (La valeur par défaut est 480)	Integer
resolution	A number that defines the resolution of the export file in DPI (dots per inch). (La valeur par défaut est 96)	Integer
world_file	If set to True, a georeferenced world file is created. The file contains pixel scale information and real-world coordinate information. (La valeur par défaut est False)	Boolean
root_filename	The root file name for each TIFF. The TIFF file name includes the RGB information for the color and can be modified to include the map name, for example, SoCal_UTM_Map_RGB_0_0_0. If no file name is defined, the color is exported as RGB_X_X_X, where X is the red, green, or blue value for the color. (La valeur par défaut est None)	String

Exemple de code

ExportToSeparatedTIFF example 1

This script exports a map to a separated TIFF using the required parameters and default settings for the optional parameters.

import arcpy
import arcpyproduction

# Check out Production Mapping extension
arcpy.CheckOutExtension("foundation")

# Define variables
mxd = arcpy.mapping.MapDocument(r"C:\Project\MXDs\Project.mxd")
out = r"C:\Project\sep_TIFFs"
settings = r"C:\Project\ect\all_colors.ect"

# Run ExportToSeparatedTIFF with only required parameters
arcpyproduction.mapping.ExportToSeparatedTIFF(mxd, out, settings)

# Check in extension
arcpy.CheckInExtension('foundation')

ExportToSeparatedTIFF example 2

This script exports the same map twice using different settings files. Visibility is set to False for two layers before export.

import os
import arcpy
import arcpyproduction

# Check out Production Mapping license
arcpy.CheckOutExtension("foundation")

# Define variables
mxd = arcpy.mapping.MapDocument(r"C:\Project\MXDs\Project.mxd")
out = r"C:\Project\tiffs"
settings = [r"C:\Project\ect\TopoMap.ect", r"C:\Project\ect\USGS.ect"]
df = arcpy.mapping.ListDataFrames(mxd)[0]

# Change visibility of layers
for lyr in arcpy.mapping.ListLayers(mxd, "", df):
    if lyr.name.lower() in ["contourl" or "openwatera"]:
        lyr.visible = False

# Loop through settings files and export map
for i in range(len(settings)):
    project_name = os.path.basename(settings[i]).split(".")[0]
    arcpyproduction.mapping.ExportToSeparatedTIFF(
         mxd, out, settings[i], root_filename="project_{0}".format(project_name))

# Check in extension
arcpy.CheckInExtension('foundation')