B4J Question Determine if an image has transparent pixels

[hanyelmehy]

how to Determine if an image has transparent pixels ( Alpha channel)
and how to remove it from image

 

[Erel]

What are you trying to do? If you want to show an image and replace the transparent regions with a solid color, then it will be simpler to put it in a panel with the relevant color.

 

[hanyelmehy]

What are you trying to do? If you want to show an image and replace the transparent regions with a solid color, then it will be simpler to put it in a panel with the relevant color.

i just want to check if image have alpha channel and remove it if found (like image utility)

 

[MathiasM]

i just want to check if image have alpha channel and remove it if found (like image utility)

Check this code: https://www.b4x.com/android/forum/threads/get-image-pixels.91666/

Just loop over all pixels, check the alpha channel. Don't know how fast this will be.

 

[hanyelmehy]

Check this code: https://www.b4x.com/android/forum/threads/get-image-pixels.91666/

Just loop over all pixels, check the alpha channel. Don't know how fast this will be.

i already use this code

Dim CheckBmb As B4XBitmap = XUI.LoadBitmap(File.GetFileParent(imgfile),File.GetName(imgfile))
    Dim bc1 As BitmapCreator
    bc1.Initialize(CheckBmb.Width,CheckBmb.Height)
    bc1.CopyPixelsFromBitmap(CheckBmb)
    Dim IsTrans As Boolean=False
    For x = 0 To bc1.mWidth - 1
        For y = 0 To bc1.mHeight - 1
            If bc1.IsTransparent(x,y) Then
                IsTrans=True
                Exit
            End If
        Next
    Next
    Log("Trans :" & IsTrans)

but i did not if this equal to java function hasAlpha() or not
also i use B4XCanvas to create new image with color background and save it as png ,but result image still have alpha channel