QGIS » QGIS Application

Issue:

I'm trying to do some simple math on QGIS Raster Calculator. In the attachment there's the original data, and the result of the calculation.

This occurs on Raster Calculator, using it manually and using QgsRasterCalculator, with this code:

    def calculate_radiance(self, rasterLayer, output, param_a=0.03705882, param_b=3.2):

        rasterEntry = QgsRasterCalculatorEntry()
        rasterEntry.ref = "ent@1" 
        rasterEntry.raster = rasterLayer
        rasterEntry.bandNumber = 1

        formula = "(ent@1 * {0}) + {1}".format(param_a, param_b)

        rasterCalculator = QgsRasterCalculator(formula,
                                               output,
                                               "GTiff",
                                               rasterLayer.extent(),
                                               rasterLayer.width(),
                                               rasterLayer.height(),
                                               [rasterEntry, ])

        result = rasterCalculator.processCalculation()
        if result == 0:
            return output

        return None

The calculation is simple (pseudosyntax - I'm using the mouse to assemble the calculation):

(raster * 0.03705882) + 3.2

I'm getting NODATA raster.

I've tried simple calculations, like

raster + 1

And there are still problems.

Information:

Versions affected: 2.6, 2.8.1 (tested only on those)

OS: Linux Mint Cinnamon and Ubuntu Studio.