Image viewer not shown when running in shiny while not in interactive mode

[hcraT]

Hi,
if I run the example from a shiny app run in non-interactive mode the image viewer is not shown.

After struggling a bit I was able to workaround the problem by adding the method parameter to the display call like:

img <- readImage(image_path)
display(img, method = 'browser')

I see that the code in the example is guarded to run only in interactive mode but I think that this behaviour is a bit confusing (other are struggling with this). Wouldn't be nice to add at least a warning message that highlight the behavior?

Thank you very much.

P.S. EBImage is a very nice library thanks for developing it.

[aoles]

Hi,
thanks for reaching out! Have you tried the Shiny bindings for display?

?`display-shiny`

Cheers,
Andrzej

[hcraT]

Hi,
I actually run the package using the shiny bindings.

In the server.R I have:

function(input, output, session) {  
....

  output$image1 <- renderDisplay({
    iii <- load_image(image_path)
    display(iii, method = 'browser')
  })
....
}

While in the ui.R

dashboardBody(
...,
  fluidRow(
    column(width = 4,
      box(
        displayOutput('image1')
      )
    ),
...
)

I cut the code to show you just the relevant parts. If I remove the method = "browser" from the call to the display function the image viewer is not shown. I would have expected that the display method would have been able to detect the context of the call (renderDisplay) and use the correct rendering method.

Thanks,
Cheers,
Tarcisio.

P.S. Of course this works if I run the example from an interactive session while it doesn't in all the other cases.