Is there a simple way to access pixels of an image informations and manipulate them in Qt?

[hor_313]

Hi dears

I want to know in an image I have loaded in my program , what are the values of RGB of every pixels?
Is there a simple way for it in Qt or I must use some libraries like OpenCV?

Thanks a lot

[utcenter]

Yes, you need the QImage class. It allows pixel level access.

[hor_313]

[quote author="utcenter" date="1367673243"]Yes, you need the QImage class. It allows pixel level access.[/quote]

Can you take an example? :D

[utcenter]

You can get the pixel information:
@
uint color = image.pixel(10, 10);@

color will be a 4x8 bit components of the color of the pixel at x 10 and y 10

@image.setPixel(20, 20, color);@

the pixel at x 20 and y 20 will become the same color as the pixel at 10 10

[hor_313]

Thanks a lot dear friend

I want to read the all RGB values of all pixels of an image and show them in a textplain box

can you take an example about this :D

[utcenter]

It is not that hard to do that yourself, plus I don't think I'd be making you a favor if I do what begin to suspect is your homework for you.

[hor_313]

[quote author="utcenter" date="1367679753"]It is not that hard to do that yourself, plus I don't think I'd be making you a favor if I do what begin to suspect is your homework for you.[/quote]

ok , thank you
but what is the unit in your example?
is it a type or a structure?

[utcenter]

uint is an unsigned int. Sounds like you need a little more C++ before you rush into Qt, you really need the basics. Otherwise you wouldn't need help with such a simple assignment.

[hor_313]

Oh I got it :))

[hor_313]

I read it unit !! :D