QImage doesn't seem to support older GIF images?

NightShadeI

QtImage does not seem to support older images

Hi, I have an older image in the form of a .gif

If I convert it online to some PNG it works fine, but not in its older format. Is this some bug in QT? (example below)

isNull() always returns true

QImage myImage{":/example.gif"};
std::cout << (int)myImage.isNull() << std::endl;

Christian Ehrlicher

@NightShadeI said in QImage doesn't seem to support older GIF images?:

QImage myImage{":/example.gif"};

I doubt this - are you sure :/example.gif is correct? Please check with QFile::exists()

JonB

@NightShadeI
I'm with @Christian-Ehrlicher on this: please check 100.00% that :/example.gif really, really is right, because I/we think it's not, and that's why you're getting a null image. If necessary try putting example.gif as an external file instead of embedded resource to verify.

NightShadeI

@Christian-Ehrlicher
@JonB

I have verified it does exist with QFile::exists (returns true) and also tried QImage::load , and it still does not work with this

Like I mentioned, If I put the image in some online converter to a png, and then use that png this does work. So I suspect Qt is not supporting this type of image.

LIke I mentioned the format here is likely very old (im talking maybe 1996). Can you try download the image and see if you get this issue too?

Chris Kawa

@NightShadeI Works for me. Do you have the gif plugin in <your app>/imageformats/ directory deployed along with your app? Do other gif files work?

JonB

@NightShadeI
Same for me as for @Chris-Kawa. Just try Qt Designer, put a QLabel on a form, use pixmap property, drop down arrow, Choose file..., pick the .gif. I see it fine. You can probably do it for a resource file too. Does that work for you in Creator/Designer?

NightShadeI

@Chris-Kawa

Ah that is embarassing, yes I hadn't added that plugin directory .. that's exactly the issue. Sorry to waste both of your times , thanks for the help also though :)