<![CDATA[Text generated by Qt 5.15 and Qt4.8 is not same usign QPainter.]]>Hello,
We have test environment which detects image and compare it with the database.
Initially we created a database using Qt4.8.
Now while porting the application to 5.15 the image generator for buttons or labels are differing in fonts.

Please help us with the appropriate solution.
PleaseWaitForVerification.PNG BeginTest.PNG

]]>https://forum.qt.io/topic/134173/text-generated-by-qt-5-15-and-qt4-8-is-not-same-usign-qpainterRSS for NodeSat, 18 Jul 2026 20:50:46 GMTTue, 08 Feb 2022 16:42:28 GMT60<![CDATA[Reply to Text generated by Qt 5.15 and Qt4.8 is not same usign QPainter. on Thu, 10 Feb 2022 06:50:27 GMT]]>If you will not update the images and continue to ask for exact equality you not going anywhere.

The difference could arise because of a difference in Qt4->5 itself, a library it depends on, a change from using a bundled library to a system library, a change in what is handed off to the operating system, how font kerning and hints are implemented, antialiasing changes, helpful "features" like Windows "High-DPI scaling"...
(You may be able to code to eliminate the last two, but I would still not expect exact equality)

You could try an image similarity algorithm
https://stackoverflow.com/questions/25977/how-can-i-measure-the-similarity-between-two-images
https://stackoverflow.com/questions/75891/algorithm-for-finding-similar-images
https://stackoverflow.com/questions/189943/how-can-i-quantify-difference-between-two-images

]]>https://forum.qt.io/post/702012https://forum.qt.io/post/702012Thu, 10 Feb 2022 06:50:27 GMT<![CDATA[Reply to Text generated by Qt 5.15 and Qt4.8 is not same usign QPainter. on Thu, 10 Feb 2022 06:05:08 GMT]]>Hello,
There are more than 15000 images, so it will be very difficult to create the database again.
So if someone can suggest the better solution would be very helpful.

]]>https://forum.qt.io/post/702003https://forum.qt.io/post/702003Thu, 10 Feb 2022 06:05:08 GMT<![CDATA[Reply to Text generated by Qt 5.15 and Qt4.8 is not same usign QPainter. on Wed, 09 Feb 2022 20:34:58 GMT]]>@karan26 said in Text generated by Qt 5.15 and Qt4.8 is not same usign QPainter.:

Please help us with the appropriate solution.

Update your screenshot database with what you get with Qt 5.15.

]]>https://forum.qt.io/post/701973https://forum.qt.io/post/701973Wed, 09 Feb 2022 20:34:58 GMT