Re: Fast image markup?

[Ethan A M. <me...@uw...>]

On Monday, 13 April 2020 11:08:01 PDT Dima Kogan wrote:

> >> I tried big images too. I THINK they work, but it's still really slow
> >> compared to any image viewer. Is that expected? Should it be faster than
> >> what "with rgbimage" does?
> >
> > "slow" when doing what?  rotating in 3D?
> > Can you do that in a normal image viewer?
> 
> Just the simplest usage: plot an image with some annotations. No 3d or
> any transformations of anything. Compared to image viewers the speed
> difference isn't subtle.

I may be misunderstanding what you are doing (quite possible).

For me using a large image (say a 1365x1024 jpg "wallpaper" photo)
as a background introduces no noticeable delay at all using the wxt
terminal.  Even for 3D rotation the response is instantaneous:

    set term wxt size 1500,1000
    set pixmap 1 at screen 0,0 size screen 1,1 behind '~/images/wallpaper/p1040193.jpg'
    splot x*y with pm3d
    [rotate/zoom/translate with mouse as normal]

For x11 the initial display is very quick, but the response to 3D rotation
is somewhat laggy.  Not bad, though.  

The strange one is actually qt, where the response to 3D rotation is horribly slow.
Zoom and pan in 2D is quick however. I'll bet there is some way to speed up the qt 
3D rendering also, but it will require some investigation. 

	Ethan