Near black ========== Description ----------- Convert nearly black/white borders to black. This utility will scan an image and try to set all pixels that are nearly or exactly black, white or one or more custom colors around the collar to black or white. This is often used to "fix up" lossy compressed airphotos so that color pixels can be treated as transparent when mosaicking Parameters ---------- ``Input layer`` [raster] Raster file in input ``How far from black (white)`` [number] Select how far from black, white or custom colors the pixel values can be and still considered near black, white or custom color Default: *15* ``Search for nearly white pixels instead of nearly black`` [boolean] Search for nearly white (255) pixels instead of nearly black pixels Default: *False* Outputs ------- ``Output layer`` [raster] Raster file in output Console usage ------------- :: processing.runalg('gdalogr:nearblack', input, near, white, output) See also -------- `GDAL nearblack `_