arcpy - Formatting dependent parameters in Python Toolbox?

I am setting up my parameters for my tool in python toolbox. So far it looks like this:

The user inputs a tif into the Input Raster. I want the Select Bands (optional) tab to be a drop down menu that includes all of the bands contained in the .tif in the Input Raster. What changes do I need to make to my code (included below) to make this happen? I do not want to use the script wizard available in arcmap. This has to be done in Python Toolbox only.

import arcpy,os,sys

class Toolbox(object):
def __init__(self):
    self.label =  "Exploding Rasters"
    self.alias  = "ER"

    # List of tool classes associated with this toolbox
    self.tools = [ExplodeRasters] 


class ExplodeRasters(object):
    def __init__(self):
    self.label       = "Explode Rasters"
    self.description = " This tool will take an input multiband raster and extract its individual bands.  "

def getParameterInfo(self):

# Input Features parameter
in_features = arcpy.Parameter(

    displayName="Input Raster",
    name="in_features",
    datatype="DEFeatureClass",
    parameterType="Required",
    direction="Input")

# create select all bands button
all_bands = arcpy.Parameter(
    displayName="Select all bands",
    name="Select_All",

    datatype="Boolean",
    parameterType="Required",
    direction="Input")             
TIFF = arcpy.Parameter(
    displayName="TIFF",
    name ="TIFF",
    datatype="Boolean",
    parameterType="Optional",
    direction="Input")
JPG = arcpy.Parameter(

    displayName="JPG",
    name="JPG",
    datatype="Boolean",
    parameterType="Optional",
    direction="Input")
IMG = arcpy.Parameter(
    displayName="IMG",
    name="IMG",
    datatype="Boolean",
    parameterType="Optional",

    direction="Input") 

# Range of Desired Bands parameter
select_bands = arcpy.Parameter(
    displayName="Select Bands",
    name="Select_Bands",
    datatype="DEFeatureClass",
    parameterType="Optional",
    direction="Input")


select_bands.parameterDependencies = [in_features.name]
select_bands.schema.clone = True

#select bands for NDVI band parameters
NDVI_red= arcpy.Parameter(
    displayName="Select a red band for NDVI calculation",
    name="NDVI_bRed",
    datatype="DERasterDataset",
    parameterType="Optional",
    direction="Input")


NDVI_NIR= arcpy.Parameter(
    displayName="Select a NIR band for NDVI calculation",
    name="NDVI_BNIR",
    datatype="DERasterDataset",
    parameterType="Optional",
    direction="Input")

#out directory
OutDir=arcpy.Parameter(

    displayName="Output Workspace",
    name="Out_Directory",
    datatype="DEWorkspace",
    parameterType="Required",
    direction="Input")

# Create filename output prefix
prefix = arcpy.Parameter(
    displayName="Output filename prefix",
    name="output_prefix",

    datatype="String",
    parameterType="Required",
    direction="Input")

parameters = [in_features, all_bands, select_bands, NDVI_red, NDVI_NIR, prefix, OutDir, TIFF, JPG, IMG]

return parameters

def execute(self, parameters, messages):
    Out_Dir=parameters[6].valueAsText

    in_raster=parameters[0].valueAsText
    out_prefix=parameters[5].valueAsText

messages.addMessage("INPUT RASTER=" +in_raster)
messages.addMessage("Yay, you're doing great!")

#individual bands within multiband rasters already exist, so overwrite

arcpy.env.workspace=in_raster
arcpy.env.overwriteOutput = True 


# get a list of the bands that make up the raster
bRng = arcpy.ListRasters()

# loop through the bands and export each one with CopyRaster
for ThisBnd in bRng:
    InBand  = ThisBnd
    bndDesc = arcpy.Describe(InBand)
    NoData  = bndDesc.noDataValue


    outRaster = os.path.join(Out_Dir, out_prefix + ThisBnd+".tif")

    #copy single band rasters
    arcpy.CopyRaster_management(InBand,outRaster, format = "TIFF", nodata_value = NoData)
return

Answer

Looking at your code, it looks like the root of your problem may lie in the very first input parameter... "Input Raster". You've defined the data type as a "DEFeatureClass", but that can only be used for vector data, not raster data.

Instead, try changing the data type to one of the raster types, defined in the help link below. I would start off with either "DERasterDataset" or "GPRasterLayer". Finally, for the "select_bands" class, I think you might be looking for the "DERasterBand" data type.

See Defining parameter data types in a Python toolbox for more detail on the types of parameters that are available in a Python toolbox.