B4A Library [B4X] BitmapCreator Effects

[Erel]

Fixed.

 

[Dadaista]

Hi
Can be added Only black and White (not greyscale)

 

[Erel]

Use the source code and add this line to Greyscale:

Public Sub GreyScale (bmp As B4XBitmap) As B4XBitmap
    Dim bc As BitmapCreator = CreateBC(bmp)
    Dim argb As ARGBColor
    For x = 0 To bc.mWidth - 1
        For y = 0 To bc.mHeight - 1
            bc.GetARGB(x, y, argb)
            Dim c As Int = argb.r * 0.21 + argb.g * 0.72 + 0.07 * argb.b
            If c < 127 Then c = 0 Else c = 255 '<--------------------------------
            argb.r = c
            argb.g = c
            argb.b = c
            bc.SetARGB(x, y, argb)
        Next
    Next
    Return bc.Bitmap
End Sub

 

[Dadaista]

Thank you @Erel !!

 

[Dadaista]

Hi

There are problems with .BMP files with "profundidad de bits" = 16 maybe "bit depth" in English. The files does not load and crash

the log Says

java.lang.IllegalArgumentException: src cannot be null

I Think could be related to Bitmapcreator

The copy of the project failing is too large for upload. Is here
I Have added two .bmp files. One file with 16 bits and another one with 32 bits

1 bit works
16 bits no works
32 bits works

How it can be solved?

Thx!!

 

[Erel]

The error is not related to BitmapCreator, as it happens when the bitmap is loaded. The image format is not supported by JavaFX.

 

[Dadaista]

How can I catch it?

 

[Erel]

With a Try / Catch block.

 

[Dadaista]

I will look for an example.
Thx @Erel

 

[ilan]

can i change the alpha level on a bitmap with this library? like settings its alpha to 0.5 ?

thanx

 

[klaus]

You can do it directly with the BitmapCreator library.
You may have a look at the BitmapCreatorDemo1 program from the B4X Graphics Booklets.

 

[Erel]

Another option, if you want to display a semitransparent image: https://www.b4x.com/android/forum/threads/b4x-change-the-views-alpha-level-transparency.123209/

 

[ilan]

You can do it directly with the BitmapCreator library.
You may have a look at the BitmapCreatorDemo1 program from the B4X Graphics Booklets.

thanx klaus i will have a look at it.

Another option, if you want to display a semitransparent image: https://www.b4x.com/android/forum/threads/b4x-change-the-views-alpha-level-transparency.123209/

But this is for a view, i am working with bitmaps. Actually i could load the bitmaps on imageviews and then just change the alpha for that view. This may work. Thanks erel

 

[Erel]

Actually i could load the bitmaps on imageviews and then just change the alpha for that view. This may work. Thanks erel

This will be the best performing solution, as long as you don't need to actually modify the bitmap.