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When multiple overlapping raster layers are rendered with similar stretched color ramp symbology, the transition between the overlapping raster layers are not smooth and, thus, display the raster boundaries, as shown in the following image.
The color ramp of each raster may have different maximum and minimum values.
Within a given raster, the values between the min and max are scaled to optimize the transition between colors. Where that raster overlaps another raster, the color assigned may be different than the color assigned to the same value in a neighboring raster. This difference creates a visible border between the rasters.
Adjust the high and low values of each raster to the maximum high and minimum low values of all the raster layers in ArcMap. Follow the steps below.
Note: The following solution works best if the raster layers have the same pixel size and are precisely aligned. For more information on pixel size of raster data, refer to the following article: Cell size of raster data
Based on the current color ramp values of the raster, determine the maximum and minimum pixel values for all rasters. These are displayed under each layer name in the Table of Contents.