#!/usr/bin/python
import sys
try:
    from PySide import QtCore, QtGui
    from PySide.QtGui import *
    from PySide.QtCore import *
except ImportError:
    from PyQt4 import QtCore, QtGui
    from PyQt4.QtGui import *
    from PyQt4.QtCore import *
class ColorWidget(QWidget):
    def __init__(self, parent):
        super(ColorWidget, self).__init__(parent)
        self.parent = parent
        self.setToolTip('Color')
        self.colorimage = QImage()
        self.maskimage = QImage()
    def paintEvent(self, event):
        w = self.width()
        h = self.height()
        qp = QPainter(self)
        pen = QtGui.QPen(QColor.fromRgbF(1,1,1,0), 1, Qt.SolidLine)
        qp.setPen(pen)
        qp.setBrush(QColor.fromRgbF(0.34,0.34,0.34,1))
        qp.drawRect(0,0,w,h)
        qp.setBrush(QColor.fromRgbF(0.67,0.67,0.67,1))
        step = int(w/10)
        wh = int(step/4)
        side = int(wh/2)
        for x in range(step):
            for y in range(step):
                qp.drawRect(x*wh,y*wh,side,side)
                qp.drawRect(x*wh+side,y*wh+side,side,side)
        self.colorimage=QImage(w,h,QImage.Format_ARGB32_Premultiplied)
        ip = QPainter()
        ip.begin(self.colorimage)
        ip.setBrush(QColor.fromRgbF(0,0,0,0))
        ip.drawRect(0, 0, w, h)
        ip.setBrush(QColor.fromRgbF(0.67,0.67,0.67,1))
        ip.drawRect(100, 100, w, h)
        ip.end()
        pix = QPixmap()
        pix.convertFromImage(self.colorimage)
        qp.drawPixmap(QtCore.QPoint(0, 0), pix)
class EditorWindow(QMainWindow):
    def __init__(self):
        super(EditorWindow, self).__init__()
        centralWidget = QWidget()
        layout = QVBoxLayout()
        widget = ColorWidget(self)
        layout.addWidget(widget)
        centralWidget.setLayout(layout)
        self.setCentralWidget(centralWidget)
        self.pixmap = QPixmap()
        self.setGeometry(300, 300, 600, 400)
        self.setWindowTitle('Colors')
        self.show()
def main():
    app = QApplication(sys.argv)
    ex = EditorWindow()
    sys.exit(app.exec_())
if __name__ == '__main__':
    main()

        ip = QPainter()
        ip.begin(self.colorimage)
        ip.setCompositionMode(QPainter.CompositionMode_Clear)
        ip.fillRect(0, 0, w, h, Qt.transparent)
        ip.setCompositionMode(QPainter.CompositionMode_Multiply)
        ip.fillRect(100, 100, w, h, QColor.fromRgbF(0.67,1,0.67,1))
        ip.end()