<![CDATA[QImage and QPıx cant read this png image but opencv does why ?]]>Hi,

I encountered a PNG image that neither :

QPixmap qpix(fileName)

nor

QImage photo(fileName);

can read . Both says invalid image.

But I can read with and succesfully convert them to qimage and qpix with opencv with :

cv::Mat cv_image = cv::imread(fileName.toStdString());

Is there any clue why this is happening this png image. Other png images has no problem..

PS: When I convert to image to jpg or export as png again its working.

image is:

http://s000.tinyupload.com/?file_id=21483901468334087956

IMAGE

]]>https://forum.qt.io/topic/105174/qimage-and-qpıx-cant-read-this-png-image-but-opencv-does-whyRSS for NodeSat, 18 Apr 2026 11:05:05 GMTSat, 20 Jul 2019 10:58:54 GMT60<![CDATA[Reply to QImage and QPıx cant read this png image but opencv does why ? on Sun, 21 Jul 2019 09:32:53 GMT]]>@RahibeMeryem
Hi
Yeah, it can do some guessing looking at the header
but I think it only tries to guess if there is
not extension.

]]>https://forum.qt.io/post/542010https://forum.qt.io/post/542010Sun, 21 Jul 2019 09:32:53 GMT<![CDATA[Reply to QImage and QPıx cant read this png image but opencv does why ? on Sun, 21 Jul 2019 09:09:56 GMT]]>@mrjj yes you right.. thanks a lot..

PS: QImage and QPixmap should check the file as opencv, it is deciding by their extension I assume.

]]>https://forum.qt.io/post/542008https://forum.qt.io/post/542008Sun, 21 Jul 2019 09:09:56 GMT<![CDATA[Reply to QImage and QPıx cant read this png image but opencv does why ? on Sat, 20 Jul 2019 11:13:52 GMT]]>Hi
The mm.png is actually a jpg file.
It just has the wrong extension.

]]>https://forum.qt.io/post/541937https://forum.qt.io/post/541937Sat, 20 Jul 2019 11:13:52 GMT