Open large TIFF file

kamgo

Hello

I need open large TIFF file. My code is the following

@
QGraphicsScene *scene = new QGraphicsScene;
scene->addPixmap(QPixmap(inputFilename));
ui.graphicsView->setScene(scene);
ui.graphicsView->show();
@

if i open image 150Mb, it's showing ok, if i open image with size around 600 Mb
program crushes. How correct read large images ?

Thanks

stereomatching

using try--catch?

kamgo

but how open ? or in qt this impossible ?

stereomatching

I don't know this is the limit of Qt or the limit of your memory, if your programs throw an exception which told you something like "out of memory", maybe you need to enlarge your ram or find someway to lower the consume of your memory.

Serenity

QImage and/or QPixmap has a size limit (width and height, not filesize), so I think, a huge tiff has also a huge size.

I know that, because I tried to create a TIFF of the XKCD comic http://xkcd.com/1110/ with the big world. After creating and trying to open it with any image viewer, it mostly crashes.

To solve this problem, I would today put every tile in QGraphicsView as an item. I would also suggest you to do that.

classpass

what is the limit of Qt. do i need some other "tiff viewer vb.net":http://www.rasteredge.com/how-to/vb-net-imaging/tiff-windows-viewer-create/ to open large tiff files or can i open it directly in Qt. i have one software that can do that stuff.

Serenity

Do you have any example tiff file?
And you can open it directly. Try it, it's just some lines of codes.

kamgo

how do you split TIFF to tiles ?

[quote author="Serenity" date="1374501723"]QImage and/or QPixmap has a size limit (width and height, not filesize), so I think, a huge tiff has also a huge size.

I know that, because I tried to create a TIFF of the XKCD comic http://xkcd.com/1110/ with the big world. After creating and trying to open it with any image viewer, it mostly crashes.

To solve this problem, I would today put every tile in QGraphicsView as an item. I would also suggest you to do that. [/quote]