# Bitmap scaling works extremely well?

**URL:** <https://forum.kirupa.com/t/bitmap-scaling-works-extremely-well/317863>\
**Category:** Uncategorized\
**Created:** [January 5, 2011, 12:09am UTC](https://forum.kirupa.com/t/bitmap-scaling-works-extremely-well/317863 "2011-01-05T00:09:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![OMG](https://avatars.discourse-cdn.com/v4/letter/o/9dc877/32.png) [@OMG](https://forum.kirupa.com/u/OMG)\
**Post date:** [January 5, 2011, 12:09am UTC](https://forum.kirupa.com/t/bitmap-scaling-works-extremely-well/317863/1 "2011-01-05T00:09:41Z")

</div>

I’m kinda new to bitmap-related stuff…so correct me if this whole thing is not how it should be done  
I was testing the quality of resizing a clip using bitmap. In some articles they say that resizing often kills the quality of a pic.  
in the library, I have a mc in which I drew a tiiiiny circle, filled it with radial coloring.

```php
var scale:Number=100;
var icircle:circle=new circle();
var bitmapData:BitmapData=new BitmapData(icircle.width*scale,icircle.height*scale);
bitmapData.draw(icircle,new Matrix(scale,0,0,scale,0,0));

var bitmap:Bitmap=new Bitmap(bitmapData);
addChild(bitmap);

```

the result is a huge circle with vector-like quality, I could only see the pixels when I zoom it.  
I guess that flash first scale the circle in vector, THEN transform in into bitmap?

edit:

1. if I want to move the bitmapdata before adding it to a bitmap, is Matrix the only option?

2. what happens if I use scroll, and the bitmap goes outside the limits set by my bitmapData? Will it auto-delete itself?

3. how do I delete part of a bitmap/bitmapData? I could always use fillRect() to set an area transparent but I don’t know if this is the right method.

thanks