ERDAS – RADARSAT MosaicPro 2D Tutorial
MosaicPro 2D
Open your georeferenced images into your viewer
Under the toolbox menu, open MosaicPro from 2D View
To see the raster image select 
And check “Vis” beside both images
You can save this workspace by selecting save 
Go to Edit –> Colour Corrections
This opens up the Color Corrections Dialogue Box. In this box you can change how the pictures mosaick together. If the colours vary between the two it can result in an image with a colour seam. Adjusting these settings can help produce a seamless image.
The following information is straight out of the ERDAS Imagine help files. Refer to the help file for more information.
Exclude Areas Set areas to exclude from the Image Dodging, Color Balancing, and Histogram Matching processes.
Use Illumination Equalizing Illumination Equalizing process is suitable for aerial photographs where there can be a dramatic difference in brightness across the image.
Use Image Dodging Correct light imbalance in the image. Image Dodging works by calculating statistics for the image and then applying a statistical correction to the intensity values of each pixel in each data layer.
Using satellite imagery with this option will typically not render the best results.
Use Color Balancing The Color Balancing tool attempts to remove the variations within the scene Automatic color balancing computes the correction parameters from the areas of overlap of the input images. Manual Color Manipulation provides greater control over the type of surface being applied to the image.
Use Histogram Matching Match the overall color and shading among images before the mosaic process. Histogram Matching converts the histogram of one band of an image to resemble another histogram.
As a Default I would recommend to try Histogram Balance. If this doesn’t work the first time, try switching the order of the images (dependent on which you open first). Which image is kept in the overlay area is dependent on which image is listed first. If you want to average the images in the overlap area try using the Edit à Set Overlap/Seamline Function Tool. The help file will explain the options within this tool
Run the Mosaick 
Let it process and open up the resulting file. If it has a seam in it then run the process again with different colour corrections.
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