Re: image or rgbimage plots with zero decorations

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

On Friday, 4 April 2025 10:32:41 PDT Dima Kogan wrote:
> Hi. I'm pretty sure this isn't possible, but I'd like to ask anyway.
> 
> I have a gnuplot script to plot an image, with some extra stuff on top
> of it. Something like this:
> 
>   set terminal png
>   set output "out.png"
>   plot "image.png" binary filetype=png flipy with rgbimage, "data" with lines
> 
> Ideally I would like the result to be a .png file with the same
> dimensions as "image.png", and I would like "image.png" to fill the
> whole output plot. I.e. I want to annotate "image.png", but not scale it
> in any way.
> 
> There are some options that help somewhat, but don't do everything:
> 
>   set autoscale noextend
>   set size ratio -1

I would have thought the heart of it would be
    set autoscale noextend 
    set margins 0,0,0,0

I think using "set size ratio" is counter-productive for this purpose.

	Ethan
 
> In practice, what I end up doing is to manually find the pixel size for
> the "set terminal png" command that results in the output image of the
> correct size, and then I crop "out.png". Is there a better way?
> 
> Thanks.