User Manual - pancroma

18. Display RGB Color Composite Image________________________________________________________________Once you have saved an RGB color image you may wish to display it for analysisor subsequent post processing. To display an already created color image,select ‘File’ | ‘Open’ and select your input image. Note that check boxesbecome visible at the lower left hand side of the Main Menu. If you check‘Activate Image Processing Routines’, you will be presented with the ImageProcessing Input Box if you are processing a GeoTiff format RGB image. (Thischeck box will not work for other file formats as a result of the way that JPEG andPNG files are read and processed).The ‘Resample Grayscale Image’ check box is only operational for grayscaleimages. If you check the ‘Generate Band Images’ check box, the ‘Generate RGBComposite Image’ check box will appear. If both are checked, an RGB colorcomposite image plus the corresponding three grayscale blue, green and redgrayscale band files will be generated. If just the ‘Generate RGB CompositeImage’ is checked, only the RGB image will be displayed. Finally, if only theGenerate Band Images’ check box is checked, the three band images will bedisplayed but the RGB image will not.Sometimes it is desirable to reverse the blue, green and red channels in thedisplayed image, for example when processing USGS North American SPOTdata available at the Earth Explorer website. To do this, check the ‘ReverseBand Order’ check box. This will reverse the band order for both the RGBdisplay and the grayscale bands, if generated. Currently, this check box is onlyactive for processing GeoTiff files.Once you have generated and/or processed the images, you can save the RGBimage by selecting ‘File’ | ‘Save RGB Image’ from the main menu. You can savethe grayscale band images (if you choose to display them) by selecting ‘File’ |‘Save Grayscale Image’. In the latter case you will be prompted for a base filename, and PANCROMA will append either ‘band1’, ‘band2’ or ‘band3’ to the endof the base file name.PANCROMA TM offers other ways to generate color composite images, forexample synthesizing pseudo true color composites from SPOT and ASTERdata. See subsequent sections for an explanation of these utilities.35