Images in png, transparent background plotted in black.

[Airpino]

Dear, I have a set of images in png with transparent backgroung generated via:
ggsave(filename = "image1.png",plot = my_ggplot,width = 4, height = 4,dpi=150, bg='transparent')

Now when, I use ggimg the transparent background is plotted as balck. I used a code like this
ggplot(df[1:10,],aes(x=.data[[names(df)[1]]], y=.data[[names(df)[2]]]))+ geom_point_img(aes( x = .data[[names(df)[1]]], y = .data[[names(df)[2]]], img = "image1.png" ), size = 1)+ theme_minimal()

There is a way to tell to goem_point_img to cosider transparent background?

[billy34]

By looking at code we can see a hint in comment on unexported function fix_img_dims in funs.R.

# Takes an input image file (either an array or matrix), along with a scalar
# alpha value, and returns an array that will always have four channels; set
# alpha to a negative number to avoid overwriting any present opacity values

By setting alpha parameter of geom_point_img or geom_rect_img to a negative value seems to solve the problem.