Python Script utilsImageOverlay

Table of Contents

• Aim of script
• General description
• Parameter description
• Examples
  • Example 1

Aim of script

The script calculates an overlay of a color image and a grey scale image.

General description

The script calculates an overlay of a color image and a grey scale image. First, it is checked whether the color image is a palette image. If this is the case, then the image is temporarily converted to a rgb image (temp_RGB.tif).The color image is transformed from the RGB color space to the IHS color space, then the combination of the images is done in the intensity channel. Finally, the result is transformed back into the RGB color space.

The following table contains a list of all involved modules and their default storage location:

Modules addressed in utilsImageOverlay

OPALS Module	Default Directory	Comments
GDAL script ptc2rgb.py	.\	used to convert a palette image to RGB
Module Algebra	.\	used to calculate the combined image

Parameter description

-colFile raster file containing a (palette) color image

Type : String
Remark : mandatory
Description:

-shdFile raster file containing a hill shading (gray image)

Type : String
Remark : mandatory
Description:

-outFile raster file containing a combination of colFile and shdFile)

Type : String
Remark : mandatory
Description:

Examples

Example 1

opalsImport -inFile flyover.laz flyover_breaklines.shp -tileSize 100
opalsDTM -inFile flyover.odm -gridSize 0.25 -neigh 12 -searchrad 1.25
opalsZColor -inFile flyover_dtm.tif
opalsShade -inFile flyover_dtm.tif
opals utilsImageOverlay.py -colFile flyover_dtm_zco.tif -shdFile flyover_dtm_shd.tif -outFile flyover_dtm_mix.tif