[SOLVED] QImage using pointer to valarray ?

[CamelFrog]

Hello,

I'm new to this Forum. In the context of loading and visualising scientific images in FITS files, as quick as possible, I am using valarray, used by the CCFITSIO library. The latter reads raw scientific images in these objects. From the QImage doc, and this specific overload :

• QImage(uchar * data, int width, int height, Format format)

I understand that QImage could take a pointer to some data in a buffer.

Is there any way to get a pointer to, say, valarray<float> myValArray ? And give it to QImage, without making any intermediate copies ?

At the moment, the compiler (VS2013) does not allow me to use
&myValArray[0] in QImage. I assume this comes from my misunderstanding of either QImage and valArray objects.

Thanks for your help.

[SGaist]

Hi and welcome to devnet,

QImage doesn't support float AFAIK. You should rather write a QImageReader subclass that decodes your image data in something supported by QImage

[CamelFrog]

@SGaist
Thank you for your reply.

Then, what should be the type of the array whose pointer can be sent to QImage(uchar *data,...) ?

Thanks

[CamelFrog]

Does QImage(uchar* data) means necessarily that i can only send char array, with numbers spanning from 0 to 255 ?

Are there other Qt classes that support other types of image arrays that are to be displayed ?

[SGaist]

It can be something else as long as there's a reader that can translate it in a format QImage understands.

QImage is the base image class, what can be done is to use OpenCV to convert your image data into something QImage can handle

[CamelFrog]

@SGaist
Ok, I just tried to rescaled my image array within an intensity between 0 to 255 and cast a uchar*, it's working now.

Thanks