# Raster image to clip
InputImage = 'Geotif.tif'

# Polygon shapefile used to clip
Shapefile = 'worldcoastlines.shp'

rasterFormat = 'GTiff'
vectorFormat = 'ESRI Shapefile'

# Open datasets
raster = gdal.Open(InputImage, gdal.GA_ReadOnly)
wktproj = raster.GetProjectionRef()
sref = osr.SpatialReference()
sref.ImportFromWkt(wktproj)

ulx, xres, xskew, uly, yskew, yres  = raster.GetGeoTransform()
lrx = ulx + (raster.RasterXSize * xres)
lry = uly + (raster.RasterYSize * yres)