class_docstr: The control widget for setting the visible
  layer, and the background image.
class_docstr_tok: ["The","control","widget","for","setting","the","visible","layer",",","and","the","background","image","."]
docstr: The blend (between background and foreground) has changed
  
  Args:
      value (float): Value in the range 0 to 1
docstr_tok: ["The","blend","(","between","background","and","foreground",")","has","changed","Args",":","value","(","float",")",":","Value","in","the","range","0","to","1"]
code: def change_blend(self, value):
      """The blend (between background and foreground) has changed
  
      Args:
          value (float): Value in the range 0 to 1
      """
      self.image_widget.set_blend(value / 100)
  
imports: import os
  from pathlib import Path
  import numpy
  import matplotlib.pyplot
  import matplotlib.style
  from matplotlib.backends.backend_qt5agg import FigureCanvas
  from matplotlib.figure import Figure
  from PyQt5.QtWidgets import QVBoxLayout, QWidget, QLabel, QSpinBox, QFormLayout, QPushButton, QFileDialog, QSlider
  from PyQt5.QtCore import pyqtSlot, Qt
  from PIL import Image
label_desc: Use image node_id 4 for calling the HyperspectralImageViewer obj's underlying member method code with example usage: obj.change_blend(value) without return types