Read or write the thumbnail embedded in a JPEG image

lalvishnu12

Hi,

I am new to Qt. I want to know how to read or write the thumbnail embedded in JPEG image using Qt classes.

I found that the “QMediaMetaData Namespace” contains the “ThumbnailImage” identifier containing the thumbnail data. But I didn’t get any examples related to that.

Please help me to find a solution.

euchkatzl

I think using QExifImageHeader is the best solution.

http://www.sigvdr.de/Code/QExifImageHeader/QExifImageHeader.html

https://qt.gitorious.org/qt-labs/seanharmers-scenegraph/source/9dead5efc0717a19eb56314c7f14479bcfadde4f:examples/photos/qexifimageheader.cpp

lalvishnu12

Thanks for the reply.

It is not part of the Qt classes.
It is an external library.

I need to know , is it possible with any Qt Classes in Qt 5.4 ?

euchkatzl

Because it is written in qt you can directly include QExifImageHeader in your project.
So you do not have to include a library. Just copy these two classes into your project folder an add it to your project.

I don't know any other possibility.

lalvishnu12

Ok , thanks
I will check it.

lalvishnu12

Hai,

I am using the * QExifImageHeader* .

I can only set thumbnail for images with thumbnail already embedded in it. While I am setting the thumbnail , it replaces the existing one.

Can't set the thumbnail for an image which don't have a thumbnail embedded in it and when I am trying to set that , the file become corrupted .

is there any possible way to write thumbnail for images without an existing thumbnail using the QExifImageHeader class ?