I'm trying to create a 8 bit GeoTIFF with this code.

Is there a way to use unsigned 8 bit? I only found the GDT_UInt16?

import numpy as np
from osgeo import ogr, osr, gdal
from osgeo.gdalconst import *

dataset = gdal.Open('test.tif')
driver = dataset.GetDriver()
driver.Create("out.tiff", cols, rows, 1, GDT_UInt16) # <- here

out_band = out_dataset.GetRasterBand(1)
out_data = np.zeros((rows,cols), np.int16)
out_band.WriteArray(out_data, 0, 0)

  • 1
    From gdal.org/frmt_gtiff.html: Currently band types of Byte, UInt16, Int16, UInt32, Int32, Float32, Float64, CInt16, CInt32, CFloat32 and CFloat64 are supported for reading and writing. Byte seems to be the closest hit.
    – user30184
    Commented Nov 20, 2014 at 9:53
  • Exactly 8 bits are 1 byte. Thank you for the reminder :)
    – gustavgans
    Commented Nov 20, 2014 at 11:00

1 Answer 1


The gdal documentation describes the GDT_Byte as an 8 bit unsigned integer (see here). So the correct gdal constant is the GDT_Byte. In your code it would be:

driver.Create("out.tiff", cols, rows, 1, gdal.GDT_Byte) 
  • 1
    also worth noting here if you've come to this question to find how to assign this in a terminal program, you can use... -ot Byte as opposed to -ot UInt16
    – rickD
    Commented Mar 20, 2021 at 1:44

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