QPixmapCache is a good candidate if you want to preload your images. There
is already a global cache that gets used anyways when you load QPixmaps
from files. You can insert them ahead of time if you want:
https://doc-snapshots.qt.io/qtforpython/PySide2/QtGui/QPixmapCache.html
When you load your app, you can insert the images. Then as you need them
you find them from the cache and it will serve them out of memory.

Using QPainter is the right way to draw a translucent image.

Justin


On Tue, Jun 26, 2018 at 8:47 PM Panupat Chongstitwattana <panup...@gmail.com>
wrote:

> By the way I went with QPainter because it's the only way I could find how
> to control opacity. Is opacity possible if I use QPixmap?
>
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