如何使用PyQt5打印预览图像

Question

我正在尝试使用QPrintPreviewDialog()打印预览PIL图像我该怎么做？

Answer 1

要将PIL图像转换为像素图(以便打印(，可以使用以下功能：

def pil2pixmap(im):
if im.mode == "RGB":
r, g, b = im.split()
im = IM.merge("RGB", (b, g, r))
elif im.mode == "RGBA":
r, g, b, a = im.split()
im = IM.merge("RGBA", (b, g, r, a))
elif im.mode == "L":
im = im.convert("RGBA")
im2 = im.convert("RGBA")
data = im2.tobytes("raw", "RGBA")
qim = QtGui.QImage(data, im.size[0], im.size[1], QtGui.QImage.Format_ARGB32)
qim = qim.smoothScaled(int(2480 / 3.2), int(3508 / 3.2))
pixmap = QtGui.QPixmap.fromImage(qim)
return pixmap

上面代码的来源：https://stackoverflow.com/a/48705903/16592435

然后要预览图像，您可以使用以下功能：

def print_image(image):

# Initializes the QPainter and draws the pixmap onto it
def drawImage(printer):
painter = QPainter()
painter.begin(printer)
painter.setPen(Qt.red)
painter.drawPixmap(0, 0, pil2pixmap(image))
painter.end()

# Shows the preview
app = QApplication(sys.argv)
dlg = QPrintPreviewDialog()
dlg.paintRequested.connect(drawImage)
dlg.exec_()
app.exec_()