def changeContrast(self, value, contrast):
        rt = int(( value - 127 ) * contrast / 100 ) + 127
        return  rt if rt in range(256) else 0 if rt < 0 else 255
   
    def changeGamma(self,  value, gamma ):
        rt = int(pow(value/255.0,  100.0/gamma)*255)
        return  rt if rt in range(256) else 0 if rt < 0 else 255

    @pyqtSlot()
    def on_butGramma_clicked(self):
        progress = QProgressDialog("Take a picture ...", "Abort", 0, 2)
        progress.show()
        progress.setValue(1)
        pMap = self.pil2qpixmap(self.cam.getImage(timestamp=3, boldfont=1))
        im = pMap.toImage()
        if im.numColors() == 0:
            if im.format() != QImage.Format_RGB32:
                im = im.convertToFormat(QImage.Format_RGB32)
            table = []
            for i in range(256):
                table.append(self.changeGamma(i, 150))
                table[i] = self.changeContrast(table[i], 200)
            if im.hasAlphaChannel():
                pass
            else:
                for y in range(im.height()):
                    for x in range(im.width()):
                        pix = im.pixel(x, y)
                        value = qRgb(table[qRed(pix)], table[qGreen(pix)], table[qBlue(pix)])
                        im.setPixel(x, y, value)
                self.label.setPixmap(pMap.fromImage(im))

Create Date : 05 กรกฎาคม 2554
Last Update : 5 กรกฎาคม 2554 23:41:39 น.		0 comments
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