I'm attempting to use gdal_merge to stitch together four JP2 aerial orthophotos. the merge is successful, but the resulting image has washed out color, as you can see here:
All color in the four original tiles looks fine before the merge.
The line I'm using to merge them is:
gdal_merge -o merged.tif -of GTiff 16SEJ790950_201103_0x1500m_4B_1.jp2 16SEJ790965_201103_0x1500m_4B_1.jp2 16SEJ805950_201103_0x1500m_4B_1.jp2 16SEJ805965_201103_0x1500m_4B_1.jp2
GDALINFO color information shows:
COLORSPACE = RGB
COMPRESSION_RATE_TARGET=2
Band 1 Block=256x256 Type=Byte, ColorInterp=Red Description = Red Overviews: 5000x5000, 2500x2500, 1250x1250, 625x625, 312x312, 156x156
Band 2 Block=256x256 Type=Byte, ColorInterp=Green Description = Green Overviews: 5000x5000, 2500x2500, 1250x1250, 625x625, 312x312, 156x156
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue Description = Blue Overviews: 5000x5000, 2500x2500, 1250x1250, 625x625, 312x312, 156x156
Band 4 Block=256x256 Type=Byte, ColorInterp=Undefined Description = AllOpacityPremultiplied Overviews: 5000x5000, 2500x2500, 1250x1250, 625x625, 312x312, 156x156
-b 1 -b 2 -b 3
for creating plain RGB image.