Re: Square aspect ratio doesn't work with very wide images and 'with rgbimage'

[Dima K. <gn...@di...>]

Ethan Merritt <me...@uw...> writes:

>> I have a very VERY non-square image file (attached). This is a 4000x20
>> png. I want to use gnuplot to plot it with a square aspect ratio. (In my
>> actual use case, I'd plot stuff on top of it). I do this:
>>
>>   set size ratio -1
>>   plot "wide.png" binary filetype=auto with rgbimage
>>
>> Normally this works, but with such a wide image the "set size ratio -1"
>> doesn't work: the image is scaled to fill the plot, and I get very tall
>> and very skinny pixels.
>
> I do not understand the problem.
> Of course the pixels are very tall and skinny, since there are 4000
> of them in one direction and only 20 in the other.

Hi.

I want a square aspect ratio of the thing being plotted (size ratio -1).
This means:

- square pixels
- the image rendered by gnuplot should thus look like the input image:
  it should be very wide; i.e. not square

The other mode is "size ratio 1" (or equivalently "size square"), which
sets a square aspect ratio on the resulting image by making the pixels
non-square.

I'm attaching a less skewed image, so that you can see that "size ratio
-1" is indeed the right thing. The issue here is that gnuplot behaves
differently with the extra-wide image.