toqpixmap() doesn't work with PyQt5

[niklashenning]

What did you do?

I tried using .toqpixmap() on a Pillow Image to convert it to a QPixmap in a PyQt5 application

What did you expect to happen?

I expected the image to load and show but the program just crashes.

What actually happened?

The program instantly crashes without the debugger even showing anything: Process finished with exit code -1073740791 (0xC0000409)

What are your OS, Python and Pillow versions?

• OS: Windows 10
• Python: Python 3.11.3
• Pillow: 10.1.0

features.pilinfo(supported_formats=False):

--------------------------------------------------------------------
Pillow 10.1.0
Python 3.11.3 (tags/v3.11.3:f3909b8, Apr  4 2023, 23:49:59) [MSC v.1934 64 bit (AMD64)]
--------------------------------------------------------------------
Python modules loaded from C:\Users\NH\AppData\Local\Programs\Python\Python311\Lib\site-packages\PIL
Binary modules loaded from C:\Users\NH\AppData\Local\Programs\Python\Python311\Lib\site-packages\PIL
--------------------------------------------------------------------
--- PIL CORE support ok, compiled for 10.1.0
--- TKINTER support ok, loaded 8.6
--- FREETYPE2 support ok, loaded 2.13.2
--- LITTLECMS2 support ok, loaded 2.15
--- WEBP support ok, loaded 1.3.2
--- WEBP Transparency support ok
--- WEBPMUX support ok
--- WEBP Animation support ok
--- JPEG support ok, compiled for libjpeg-turbo 3.0.0
--- OPENJPEG (JPEG2000) support ok, loaded 2.5.0
--- ZLIB (PNG/ZIP) support ok, loaded 1.3
--- LIBTIFF support ok, loaded 4.6.0
*** RAQM (Bidirectional Text) support not installed
*** LIBIMAGEQUANT (Quantization method) support not installed
*** XCB (X protocol) support not installed
--------------------------------------------------------------------

Not working with PyQt5:

import sys
from PIL import Image
from PyQt5.QtWidgets import QMainWindow, QLabel, QApplication


# NOT WORKING
class Window(QMainWindow):
    def __init__(self):
        super().__init__(parent=None)

        image = Image.open('test.png')

        self.label = QLabel(self)
        self.label.setPixmap(image.toqpixmap())
        self.label.setFixedSize(64, 64)
        self.label.move(0, 0)


app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())

Same code with PyQt6 works:

import sys
from PIL import Image
from PyQt6.QtWidgets import QMainWindow, QLabel, QApplication


# WORKING
class Window(QMainWindow):
    def __init__(self):
        super().__init__(parent=None)

        image = Image.open('test.png')

        self.label = QLabel(self)
        self.label.setPixmap(image.toqpixmap())
        self.label.setFixedSize(64, 64)
        self.label.move(0, 0)


app = QApplication(sys.argv)
window = Window()
window.show()
app.exec()

I found this workaround to be working for PyQt5, but honestly I'd rather figure out why toqpixmap() isn't working:

import sys
from PIL import Image
from PyQt5 import QtGui
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QMainWindow, QLabel, QApplication


# WORKAROUND
class Window(QMainWindow):
    def __init__(self):
        super().__init__(parent=None)

        image = Image.open('test.png')
        q_image = QImage(image.tobytes('raw', 'RGBA'), image.width,
                         image.height, QtGui.QImage.Format.Format_RGBA8888)

        self.label = QLabel(self)
        self.label.setPixmap(QPixmap.fromImage(q_image))
        self.label.setFixedSize(64, 64)
        self.label.move(0, 0)


app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())

[niklashenning]

I uploaded the examples and the image:
issue_7994_code.zip

[Yay295]

What does this say?

from PIL import ImageQt
print(ImageQt.qt_is_installed)

[niklashenning]

What does this say?

from PIL import ImageQt
print(ImageQt.qt_is_installed)

This prints True

[Yay295]

Ah, #7059 would be the reason.

[niklashenning]

Oh, I didn't expect that. Thanks for the quick help!

[radarhere]

Just to explicitly state here - Qt5 support was removed in Pillow 10.0.0. See https://pillow.readthedocs.io/en/stable/deprecations.html#pyqt5-and-pyside2