tryying to get pixel2d to work

pixel2d testing

"""
panda3d learning
Exploring default scene graphs rooted with render, render2d, pixel2d
"""
from direct.showbase.ShowBase import ShowBase
from panda3d.core import Texture, CardMaker, NodePath #, PTAUchar,
import numpy as np 

#Create random numpy array
size = 1024
texture = 255*np.ones((size, size), dtype = np.uint8) #make textures a power of 2
#texture = np.array(np.random.rand(512,512) * 255, dtype=np.uint8)    
texture[1022:1023,:] = 0
texture[1000:1010,:] = 0 #horizontal black line
texture[250:260,:] = 120 #horizontal gray line
texture[:,250:260] = 230 #vertical light line
texture[:, 1020:1023] = 0 

class MyApp(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)
        self.imageTexture = Texture("image")
        self.imageTexture.setup2dTexture(size, size, Texture.T_unsigned_byte, Texture.F_luminance) #could give more params
        self.imageTexture.setRamImage(texture)  

        cm = CardMaker('card')      
        #cm.setFrameFullscreenQuad() 
        self.card= NodePath(cm.generate())
        self.card.setTexture(self.imageTexture)

        #self.card.reparentTo(self.render2d) #this shows the image
        self.card.reparentTo(self.pixel2d) #this shows nada....
        
        self.cam.setPos(0, -4, 0) #this shouldnt do anything

app = MyApp()
app.run()