[Gambas-user] Sample code to convert image to b/w image
Safiur Rahman
isafiur at gmail.com
Sun Sep 17 04:02:11 CEST 2023
Application using gb.image, gb.image.effect and gb.media in addition to
gb.qt5
There are two controls for image:
Drawing Area (dwgVideo) and ImageView (ImageView1)
Private myPlayer As New MediaPlayer As "Player"
Public Sub Button1_Click()
With myPlayer
If .State = Media.Playing Then
.Stop
Endif
.URL = "v4l2://" & ComboBox1.Text
.SetWindow(dwgVideo)
.Play()
End With
End
'While adding values of Opacity or threshold there is error
Public Sub BtnTakeShot_Click()
Dim ximage As Image
If myPlayer.State <> Media.Playing Then Return
ximage = myPlayer.Video.Image
If chkopacity.Value Then
ximage = ximage.Opacity(spnopacity.Value)
Endif
If chkthres.Value Then
ximage.Threshold(spnthreshold.Value)
Endif
ImageView1.Image = ximage
End
Attached a sample project
On Sun, Sep 17, 2023 at 1:19 AM Safiur Rahman <isafiur at gmail.com> wrote:
> Hi
>
> I want to achieve the following black-in-white image output with
> Imagemagick with gambas
> $ convert old.png -alpha off -threshold 50% new.png
>
> Any sample code to achieve it?
>
> Also using Image.Opacity and Image.Threshold, I get following errors
>
> With Image.Opacity(50) I am getting error "The image must have an alpha
> channel"
> With Image.Threshold(0.5) the gambas crashed.
>
>
>
> --
> Regards
> Safiur Rahman
>
--
Regards
Safiur Rahman
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