i'm taking a few lines of code i've found on the internet and am trying to write the c++ equivalent, however, the documentation on some of these classes/functions is often vague or not as comprehensive as i would like. also, i don't have qt set up to run/test any of this myself as i only needed to figure out these 3 things.

here are three code samples i'm working with and my questions for each one:

Qt Code: 
  1. QImage image2 = image1->scaled(image1->size()/2);
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Question 1:
does 'QImage image2' malloc memory and then contain a scaled version of 'image1', OR is 'image1' actually being scaled itself and 'image2' is just a pointer to 'image1'?

Qt Code: 
  1. for(y=0;y<height;y++){
  2. 	QRgb* image2 = (QRgb*)image1->scanLine(y);
  3. 	//...
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Question 2:
Same thing here. Is 'QRgb* image2' allocating memory to store the scanline of 'image1'?

Qt Code: 
  1. QVector<QRgb> colortable;
  2. image1->setColorTable(colortable);
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Question 3:
what exactly is setColorTable doing/creating? it seems to be some sort of array/list of unique colors found in 'image1' - sort of like a palette, but that's all i could guess. if so, is this list sorted in any fashion, or is there anything else that might be important to know about it?

thanks in advance for your help!!!