memory cost of DrawImage

[leio]

if I want to draw a big image (for example 4000X6000) to a graphics, it will cost a lot of memory (about 200M) when g.DrawImage is called.
Is it inevitable?

Bitmap bmp = new Bitmap(4000, 6000) // here cost about 100~200M memory

...

g.DrawImage(bmp, 0, 0); // here cost another 200M again!

 

[snarfblam]

why does this cost another 200M? .drawimage() only blts from one image to another. it doesnt create any new objects (as far as i know)

 

[leio]

theres two cases in my code.

The first is that g is a print graphics, etc. g = e.graphics. And g.DrawImage does cost another 200M.

Another case is that, g is generate from g = graphics.FromImage(bmp), then set the transform matrix g.ScaleTransform(...), then g.DrawImage costs about 100M memory.