Android Question Make picture white transparent

[MitchBu]

I found this thread about BitmapExtended, but the library does not seem to have updated since 2011. The demo no longer works.

BitmapExtended Library

Hey, Let's give Basic4Android a boost with a new library: BitmapExtended. With BitmapExtended, you can do a lot more with your bitmaps: - Resizing, Scaling, Skewing and translating. - compressing - createScaledbitmap - erasing colours - get density - change pixels - Different ways...

www.b4x.com

Is there any other solution to make white transparent ?

TIA

 

[Peter Simpson]

I've used this in the past @MitchBu, and it still works great. I'm more than sure that Erel or another user posted some example code for color swapping.

RSImageProcessing Library

 

[sorex]

I think that bitmapCreator has a replace color function.

 

[klaus]

What do you mean exactly with : to make white transparent ?
As sorex already suggested, you may have a look at BitmapCreator.
BitmapCreator is now an internal library shipped with B4A.
You may have a look at the B4X Graphics Booklet, chapter 2.5 BitmapCreator explains the library with example code.
Maybe it could also be done with a Canvas.

 

[Erel]

BitmapCreatorEffects class includes a ReplaceColor method: https://www.b4x.com/android/forum/threads/b4x-bitmapcreator-effects.93608/#content