# Changing Alpha of a bitmapData

**URL:** <https://forum.kirupa.com/t/changing-alpha-of-a-bitmapdata/302949>\
**Category:** flash\
**Created:** [January 11, 2010, 5:51am UTC](https://forum.kirupa.com/t/changing-alpha-of-a-bitmapdata/302949 "2010-01-11T05:51:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![four4swords](https://avatars.discourse-cdn.com/v4/letter/f/87869e/32.png) [@four4swords](https://forum.kirupa.com/u/four4swords)\
**Post date:** [January 11, 2010, 5:51am UTC](https://forum.kirupa.com/t/changing-alpha-of-a-bitmapdata/302949/1 "2010-01-11T05:51:41Z")

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Hi,

I’m blitting a map onto the screen with tiles… and the source of these tiles are BitmapData objects.

I know you can change the alpha of a bitmap… but I’m not too sure if it can be done on the BitmapData object itself.

I want some tiles to have less alpha than others. Applying the alpha to the Bitmap… makes everything on the current screen have an alpha… but I only need one tile of it…

Does anyone have any ideas how I could accomplish this?

Thanks.